Answer:
use v²=u²+2as
v=35
u=0
a=9.8
35²=0²+2*9.8s
1225/2=9.8s
s = 62.5m
answer=62.5m
Answer:
The height from which the coin fell:
H = 63 m
Explanation:
Given:
V₀ = 0 m/s
V = 35 m/s
g = 9.8 m/c²
___________
H - ?
The height from which the coin fell is calculated by the formula:
H = (V² - V₀²) / (2·g)
H = (35² - 0²) / (2·9.8) ≈ 63 m
In a certain experiment, a filament in an evacuated lightbulb carries a current I₁ and you measure the spectrum of light emitted by the filament, which behaves as a black body at temperature T₁ . The wavelength emitted with highest intensity (symbolized by λmax) has the value λ₁ . You then increase the potential difference across the filament by a factor of 8 , and the current increases by a factor of 2 .(i) After this change, what is the new value of the tempera-ture of the filament? (a) 16 T₁ (b) 8 T₁ (c) 4 T₁ (d) 2 T₁ (e) still T₁
Using Stefan's equation, which states that the power of the emitted radiation will be proportional to the fourth power of the absolute temperature, we treat the filament of the evacuated light bulb as a black body.
P = σ AeT⁴
Where A is the surface area of the emitter, σ is Stefan's constant, and e is the emissivity of the surface.
Now, from Stefan's Law, the radiated power is proportional to the fourth power of temperature.
P =IV
IV ∝ T⁴
Therefore,
I₁ V₁ / (I₂ V₂) = (T₁ / T₂)⁴
T₁ / T₂ = (I₁ V₁ / I₂ V₂)^{1/4}
T₂ = T₂ [ (I₁ V₁ / I₂ V₂)^{1/4} ]
Now we have,
I₂ = 2I₁ and
V₂ = 8V₁
Therefore,
T₂ = T₁ [ (2I₁ )(8V₁)/(I₁ V₁) ]^{1/4}
T₂ = T₁ (16)^{1/4}
T₂ = 2T₁
The correct option is (d).
Learn more about Stefan's Law here:
https://brainly.com/question/13170634
#SPJ4
Q|C Spherical waves of wavelength 45.0 cm propagate outward from a point source. (c) Explain how the phase of the wave at a distance of 240 cm compares with the phase at 60.0cm at the same moment.
We are given distance of the center of the source for two waves:
[tex]D_{1} =240 cm[/tex]
[tex]D_{2} =60 cm[/tex]
C) Calculating how their phases compares:
ΔФ240[tex]=\frac{D_{2} }{D_{1} } .[/tex]ΔФ60
[tex]\frac{240}{60} .[/tex]ΔФ60 = 4.ΔФ60
How can you determine a wave's phase?
The period, or length of each cycle, is determined by dividing the frequency by 1, so 1/100 corresponds to a period of 0.01 seconds. The phase shift equation is given by ps = 360 * td / p, where td is the time interval between waves, p is the wave period, and ps is the phase shift in degrees.Phase: The "Phase" of a waveform refers to the location of the moving particle and is expressed in "Radians or degrees."
Phase difference, also known as "Phase angle," is the amount of time that one wave precedes or follows another.
To learn more about Phase of the wave, visit:
https://brainly.com/question/17095727
#SPJ4
four solid plastic cylinders all have radius 2.33 cm and length 5.82 cm. find the charge of each cylinder given the following additional information about each one.
the charge of each cylinder given the following additional information about each one is 10434.445 coulomb, 14906.35 Coulomb, 178876.2 coulomb, 223,595.25 coulomb.
Equation :To solve this question we are to use the equation 1 below :
Charge Q = uniform charge density p × Total area of the cylinder A
From the question, we are given radius, R to be 2.33 cm and length, L to be 5.82 cm.
Calculate for the total area of the cylinder, A. equation 2
Total area of the cylinder, A = area of the top surface + area of the bottom + area of the curved surface of the cylinder.
Hence, total area of the cylinder A is;
πR^2 + πR^2 + 2πRL.
Then, total area of the cylinder A is;
(L + R)2πR.
find the charge of each cylinder equation 3
For the first cylinder; we have the uniform charge density to be 35 nC/m^2.
Therefore, the combination of equation (1) and (3) gives equation 4
Charge Q= p × (L + R)2πR
Hence,
Charge Q = 35 × [(5.82 + 2.33) 2× 3.143 × 5.82]
Charge Q = 10434.445 coulomb.
For the cylinder B, we have a uniform charge density of 50 nC/m^2.
Using equation (4),
charge Q = p × (L + R)2πR
= 50 × [(5.82 + 2.33) 2× 3.143 × 5.82]
= 14906.35 Coulomb
For The cylinder C, the uniform charge density is 600, we use of equation (4);
Charge Q = 600 × 298.127
Charge Q = 178876.2 coulomb.
For cylinder D, the uniform charge density is 750 nC/m^2. use of equation (4)
Charge Q = 298.127 x 750
charge Q = 223,595.25 coulomb.
To know more about charge visit :
https://brainly.com/question/19886264
#SPJ4
Using the graph provided, determine the velocity in meters per second of the object at t = 2 seconds.
+/-
The velocity in meters per second of the object at t = 2 seconds is 2.5 m/s
What is velocity?Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:
Velocity = displacement / time
How to determine the velocity of the object at t = 2 sFrom the question given above, the following data were obtained:
Time = 2 sDisplacement = (3.33 + 6.67) / 2 = 5 mVelocity =?Velocity = displacement / time
Velocity = 5 / 2
Velocity = 2.5 m/s
Thus, the velocity is 2.5 m/s
Learn more about velocity:
https://brainly.com/question/3411682
#SPJ1
A conducting rod is moving perpendicularly through a uniform magnetic field. Why does the motional emf drop to zero when the conductor stops moving in the field?.
The electric charge on the rod is no longer separated.
If the magnetic field is parallel to the position of the exposed surface the magnetic flux produced will be zero if the magnetic field is non-zero. If a charged particle moving parallel to the magnetic field has a velocity parallel to the magnetic field, then the force is zero In the above case the velocity is parallel to the magnetic field lines, so the magnetic force is zero.
Induced currents can be created by changing the strength of the magnetic field changing the size of the wire loop, or changing the direction of the wire loop. The main difference between magnetic flux and flux density is that magnetic flux is a scalar quantity whereas flux density is a vector quantity. Flux is the scalar product of flux density and area vector.
Learn more about A uniform magnetic field here:-https://brainly.com/question/25655915
#SPJ1
in 7 seconds, a projectile goes from 0 to 181m/s. What is the acceleration l? (round to the nearest whole number)
Answer:
84.83 ft/s^2 or 85 ft/s^2
Explanation:
A = Δ v Δ t
Acceleration is the rate of change of an objects speed; in other words, it's how fast velocity changes. According to Newton's second law, acceleration is directly proportional to the summation of all forces that act on an object and inversely proportional to its mass. It's all common sense - if several different forces are pushing an object, you need to work out what they add up to (they may be working in different directions), and then divide the resulting net force by your object's mass.
This acceleration definition says that acceleration and force are, in fact, the same thing. When the force changes, acceleration changes too, but the magnitude of its change depends on the mass of an object. This is not true in a situation when the mass also changes, e.g., in rocket thrust, where burnt propellants exit from the rocket's nozzle.
In the 17th century, Sir Isaac Newton, one of the most influential scientists of all time, published his famous book Principia. In it, he formulated the law of universal gravitation which states that any two objects with mass will attract each other with a force exponentially dependent on distance between these objects (specifically, it is inversely proportional to the distance squared). The heavier the objects are, the greater is gravitational force. It explains, for example, why planets orbit around the very dense Sun.
In Principia, Newton also includes three laws of motion which are central to understanding the physics of our world. The acceleration calculator is based on three various acceleration equations, where the third is derived from Newton's work:
a = (v_f - v_i) / Δt,
a = 2 * (Δd - v_i * Δt) / Δt²,
a = F / m,
where:
a is the acceleration,
v_i and v_f are respectively the initial and final velocities,
Δt is the acceleration time,
Δd is the distance traveled during acceleration,
F is the net force acting on an object that accelerates,
m is the mass of this object.
If you already know how to calculate acceleration let's focus on the units of acceleration. You can derive them from the equations we listed above. All you need to know is that speed is expressed in feet per second (imperial/US system) or in meters per second (SI system) and time in seconds. Therefore, if you divide speed by time (as we do in the first acceleration formula), you'll get acceleration unit ft/s² or m/s² depending on which system you use.
Alternatively, you can use the third equation. In this case, you need to divide force (poundals in US and newtons in SI) by mass (pounds in US and kilograms in SI) obtaining pdl/lb or N/kg. They both represent the same thing, as poundal is pdl = lb * ft/s² and the newton is N = kg * m/s². When you substitute it and reduce the units, you'll get (lb * ft/s²) / lb = ft/s² or (kg * m/s²) / kg = m/s².
There is also a third option that is, in fact, widely used. You can express acceleration by standard acceleration, due to gravity near the surface of the Earth which is defined as g = 31.17405 ft/s² = 9.80665 m/s². For example, if you say that an elevator is moving upwards with the acceleration of 0.2g, it means that it accelerates with about 6.2 ft/s² or 2 m/s² (i.e., 0.2*g).
A proton having an initial velvocity of 20.0i Mm/s enters a uniform magnetic field of magnitude 0.300 T with a direction perpendicular to the proton's velocity. It leaves the field-filled region with velocity -20.0j Mm/s. Determine(c) the distance the proton traveled in the field.
The distance the proton traveled in the field is 2.09m.
What is a proton?A stable subatomic particle known as a proton with the symbols p, H+, or 1H+ and an elementary electric charge of +1e. It has a mass that is somewhat lower than that of a neutron, and because of the proton to electron mass ratio, it has an 1836-fold greater mass than an electron. The term "nucleons" refers to protons and neutrons, both of which have masses of roughly one atomic mass unit (particles present in atomic nuclei).
In the nucleus of every atom, there are one or more protons. They offer the central force of electrostatic attraction that holds the atomic electrons together.
Explanation:
Now as the initial and final velocity makes 180degree angle, So, the proton must have travelled only half a revolution. So, the distance ,d will be :
d=2πr/2=πR
d=2.09m
To learn more about proton ,visit:
https://brainly.com/question/1176627
#SPJ4
inclined plane how much work does it take to slide a crate 20 m along a loading dock by pulling on it with a 200-n force at an angle of 30° from the horizontal?
The work it takes to slide a crate 20 m along a loading dock by pulling on it with a 200-n force at an angle of 30° from the horizontal is 346.4J.
What is work?
The energy that is transmitted to or from an object when a force is applied along a displacement is referred to as work in physics. In its simplest form, it is typically explained as the outcome of force and displacement. Positive work is the term for the component of a force that moves the point of application when it is applied. A force is said to do negative work if, at the point of application, one of its components points in the opposite direction of the displacement.
Calculations:
Work done= component of force along displacement x displacement
= F cosΘ x d
= 200cos 30 x2
= 346.4 J
To learn more about work ,visit:
https://brainly.com/question/14275315
#SPJ4
i go 540km at a speed of 100 km per hour how long does it take?
Answer: 5.4 hours.
Explanation:
So, this would simply be divison. So, we can take 540 km, and seperate it into 500 km, and 40 km.
That being said, we can divide 500 km by 100, so we can see how many hours it takes for 500 km, which is 5.
Now, we divide 40/100, which gives us 0.4.
Add the two together, and it takes 5.4 hours to reach 540 km at a speed of 100 km/hr
Helllp
What is velocity at d,e,g,h and j
PLEASEEEEE HELP NO ONE EVER HELPS ME
Switch on your light source and make sure it's shining onto a wall.hold your largest cardboard square between the light source and the wall.wha do you observe?
Light source will pass through and form a shadow, when I hold the largest cardboard between the light source and the wall. Since, the cardboard is not so thick it will allow rays to pass through it.
Light rays always travel in a straight line. A shadow is formed when the light rays hit an opaque object. Sun is a natural source of light. The rays from the sun fall on objects on earth and forms shadows. Light rays do not interfere with each other if they come cross each other. Light rays travel from the direction of source to the direction of eye. They show property of reflection wherein after colliding a surface they trace their path back.
To know more about Shadows:
brainly.com/question/24806314
#SPJ4
What is the difference between a testing and outcome variable??
Answer:
The independent variable is the cause. Its value is independent of other variables in your study. The dependent variable is the effect. Its value depends on changes in the independent variable.
Explanation:
Hope this helps!
the gauge pressure at the bottom of a cylinder of liquid is 0.40 atm . the liquid is poured into another cylinder with twice the radius of the first cylinder. part a what is the gauge pressure at the bottom of the second cylinder?
The gauge pressure at the bottom of the second cylinder is 0.10 atm.
What do you mean by gauge pressure?The pressure of a system above the atmospheric pressure is known as gauge pressure, commonly referred to as overpressure. The pressure from the weight of the atmosphere is included in gauge pressure readings because gauge pressure is zero-referenced against ambient air (or atmospheric) pressure. This indicates that gauge pressure varies in response to both weather and height above sea level. Gauge pressure measurement is adequate for the majority of industrial applications because every operation in a refinery or manufacturing facility operates at the same air pressure. Absolute pressure is a measurement of pressure that is based on a reference pressure of zero or absolutely no pressure. The only place where this happens naturally is in a perfect vacuum, which can only be found in space.
To learn more about Gauge pressure, Visit:
https://brainly.com/question/20709159
#SPJ4
Suppose you have found a piece of material. You are not sure what the material is. You want to find out if it is a good conductor or a good insulator. Describe in words what you would do to determine if the material is an electrical conductor.
Answer:
Touch the open ends of the two wires to each other to form a circuit and test the bulb. Touch the two open ends of the wire to each material you are testing, one at a time. If the bulb lights up, it is a good conductor. If it doesn't, it is a good insulator.How do you know if an object is a good conductor and poor conductor of electricity?
Image result for Suppose you have found a piece of material. You are not sure what the material is. You want to find out if it is a good conductor or a good insulator. Describe in words what you would do to determine if the material is an electrical conductor.
Difference between Good Conductor and Bad Conductor of Electricity. Good conductors are those materials which allow electricity to pass through them easily. Bad conductors are those materials which do not allow electricity to pass through them easily.
20. A boy runs 400 m at an average speed of 4.0 m/
s. He runs the first 200 m in 40 s. How long does he
take to run the second 200 m?
Answer:
40s to run the second 200 m
Explanation:
the average speed is 4.0 m/s
if he is moving at a constant speed he should be able to run the first and second have at the same time
what is the total capacitance of a certain circuit containing three capacitors with capacitances of .25 microfarad, .03 microfarad, and .12 microfarad, respectively? (note: c(t)
The total capacitance of the capacitor circuit is 40 μF.
We need to know about capacitor circuits to solve this problem. The capacitance will be summed up when the capacitor is combined in parallel. The total capacitance can be determined as
Ct = C1 + C2 + C3
From the question above, we know that:
C1 = 25 μF
C2 = 3 μF
C3 = 12 μF
By substituting the parameters, we can get
Ct = C1 + C2 + C3
Ct = 25 μF + 3 μF + 12 μF
Ct = 40 μF
Hence, the total capacitance of the circuit is 40 μF.
For more on capacitance at: https://brainly.com/question/28221251
#SPJ4
Plane used to remove the tip of your nose
A. Transverse (top/bottom)
B. Sagittal (sides)
C. Frontal (front/back)
Plane used to remove the tip of your nose is known to be called option C. Frontal (front/back).
What is another name for the coronal plane?In regards to biology, If a person were to cut their nose off, it is one that is known to be called coronal.
The coronal plane is said to be a term that is often referred to as the frontal plane and it is seen as any vertical plane that shares the body into ventral as well as dorsal (belly and back) parts.
Therefore one can say that the coronal Plane (Frontal plane) used to remove the tip of your nose.
Learn more about coronal plane from
https://brainly.com/question/2090020
#SPJ1
An engineer in a locomotive sees a car stuck on the track at a railroad crossing in front of the train. When the engineer first sees the car, the locomotive is 350 m from the crossing and its speed is 12 m/s. If the engineer’s reaction time is 0.56 s, what should be the magnitude of the minimum deceleration to avoid an accident? Answer in units of m/s^2.
The magnitude of the minimum deceleration to avoid an accident is 2,186.5 m/s².
Minimum acceleration to avoid accidentThe minimum acceleration to avoid accident is calculated as follows;
s = ut + ¹/₂at²
where;
u is the initial velocitya is the minimum accelerationt is time of motionSubstitute the given parameters and solve for the acceleration as follows;
350 = 12(0.56) + ¹/₂(0.56²)a
350 = 6.72 + 0.157a
0.157a = 350 - 6.72
0.157a = 343.28
a = 343.28/0.157
a = 2,186.5 m/s²
Thus, the magnitude of the minimum deceleration to avoid an accident is 2,186.5 m/s².
Learn more about minimum deceleration here: https://brainly.com/question/14440398
#SPJ1
A⁵⁷ Fe Fe nucleus at rest emits a 14.0keV photon. Use conservation of energy and momentum to find the kinetic energy of the recoiling nucleus in electron volts. Use M c² = 8.60 × 10⁻⁹J for the final state of the ⁵⁷Fe nucleus.
Kinetic energy is K = 1.82 × 10⁻³ eV.
⁵⁷Fe nucleus emits 14 keV photons at rest.
We have, Mc² = 8.6 × 10⁻⁹ J in the final state of the nucleus.
Let p(nucleus) be the moment of the nucleus and p(photon) be the momentum of the photon.
Then, by conservation of momentum since the total moment is zero.
p(nucleus) = p(photon) = E(γ) / c = 140 keV / c
The energy for the recoiling nucleus is given as:
E² = p²c² + (mc²)²
Now, Mc² = 8.60 × 10⁻⁹J =5.38 × 10¹⁰ eV = 5.38 × 10⁷ keV
Therefore,
(Mc² + K²) ² = (14 keV)² + (Mc²)²
(1 + K²/Mc²)² =(14/Mc²)² +1
The term (1 + K²/Mc²)² is less than 1 therefore, (14/Mc²)² + 1 is equal to 1 by clacualtor.
Now using binomial theorem,
(1 + K²/Mc²)² = √[1 + ((14/Mc²)²] = 1 + (1/2)(14/Mc²)²
K = 1.82 × 10⁻³ eV
Learn more about kinetic energy here:
brainly.com/question/114210
#SPJ4
a group of students launches a model rocket in the vertical direction. based on tracking data, they determine that the altitude of the rocket was 89.6 ft at the end of the powered portion of the flight and that the rocket landed 17 s later. the descent parachute failed to deploy so that the rocket fell freely to the ground after reaching its maximum altitude. assume that g
The speed of rocket is ,V₀ = 268.42ft/sec
A projectile is an object upon which the only force is gravity.
a rocket launched in vertical direction by a group of students.
The path of projectile will be parabola.
to find the speed of the rocket is we use the equation of a projectile motion the data determined by them is
Initial height is.[tex]y_{0 } =[/tex] 89.6 ft
final height is [tex]y_{f} =[/tex] 0ft
time taken, t = 17sec
as we know , g = 32.2 ft/s²
g is acceleration due to gravity.
[tex]y_{f} - y_{o} = V_{o}t - \frac{1}{2} g t^{2}[/tex]
0 = 89.6 + 17V₀ - 16.1 × (17)²
V₀ = 268.42ft/sec
The speed of rocket is ,V₀ = 268.42ft/sec
To know more about equation of projectile motion:
https://brainly.com/question/21496711
#SPJ4
Two spheres are made of the same metal and have the same radius, but one is hollow and the other is solid. The spheres are taken through the same temperature increase. Which sphere expands more?.
The ideal selection is C. The spheres will each grow evenly.
What is the coefficient of expansion?The coefficient of expansion of any material is the property of the material which defines the expansion or contraction of the material with the variation of the temperature.
The ratio of a body's length, area, or volume at a given temperature, usually 0° C, to its length, area, or volume at that temperature, respectively, while maintaining constant pressure.
Given that two spheres with the same radius and formed of the same metal are hollow and solid, respectively. The same temperature rise is applied to the spheres.
Since both bodies in this instance are formed of the same substance, their orientation has no bearing on how much it expands. Because the materials used to create both spheres were the same, we can thus conclude that they will expand equally.
Therefore, both materials will expand equally.
The complete options are given below:-
A Hollow sphere will expand more than the solid one.
B Solid sphere will expand more than the hollow one.
C Both spheres will expand equally.
D None of these
To know more about the coefficient of expansion follow
https://brainly.com/question/24215446
#SPJ4
The micrometer 1 is often called the micron , a) how many microns make up 1.8km ? b) how many centimeters equal 1.8 ? c) how many microns are in 1.8 yd ?
By unit conversion, the converted unit is
a. 1.8 km = 1.8 x 10⁹ μm
b. 1.8 μm = 1.8 x 10¯⁴ cm
c. 1.8 yard = 1645920 μm
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
a. 1.8 km = .... μm
b. 1.8 μm = .... cm
c. 1.8 yard = .... μm
Find the microns (1 km = 10⁹ μm)
1.8 km = 1.8 x 10⁹ μm
Find the centimeter (1 cm = 10⁴ μm)
1cm = 10⁴ μm
1/10⁴ cm = 1 μm
Hence,
1.8 μm = 1.8/10⁴ cm
1.8 μm = 1.8 x 10¯⁴ cm
Find the microns (1 yd = 914400 μm)
1.8 yard = 1.8 x 914400 μm
1.8 yard = 1645920 μm
Find more on unit conversion at: https://brainly.com/question/4158962
#SPJ4
What does a radio wave do to the charges in the receiving antenna to provide a signal for your car radio?
Radio waves allows the charges in the receiving antenna to respond to the electric field portion of the carrier wave.
What is a wave?This refers to a type of disturbance which transports energy from one place to another without the actual movement of the particles and of various types such as microwaves, radio waves etc.
The radio wave allows the electrons in the rod to vibrate with amplitudes which emulates those of the carrier wave and in this case, it is the antenna thereby resulting in the signals in the car radio being provided as a result of these type of interactions.
Read more about Radio waves here https://brainly.com/question/69373
#SPJ1
A straight wire carrying a 3.00-A current is placed in a uniform magnetic field of magnitude 0.280 T directed perpendicular to the wire. (b) Explain why you can't determine the direction of the magnetic force from the information given in the problem.
The reasons are discussed below -
We have a straight current carrying wire placed in a uniform magnetic field.
We have to explain why we can't determine the direction of the magnetic force from the information given in the problem.
What is the magnitude of force acting on a current (I) carrying wire of length (L) placed in a Magnetic field (B)?The force on the current carrying wire will be -
F = IBL sinθ
According to the question -
It is impossible to determine the direction of magnetic force because of the following reasons -
Firstly, the length of the wire present in the region of magnetic field is given. If we assume it to be ∞, then -
F = IB sin(θ) x ∞ = ∞ (which is not a valid result)
Secondly, Although it is mentioned that a straight current carrying wire is placed perpendicular to the uniform magnetic field, there is no mention about the exact orientation of the magnetic field direction. For example, if we consider the wire along +x axis then perpendicular could be any of the four directions -
+k, -k, +j, -j
Hence, these are the reasons why we can't determine the direction of the magnetic force from the information given in the problem.
To solve more questions on Magnetic force on wire, visit the link below-
brainly.com/question/13103888
#SPJ4
a 2-kg mass attached to the end of a spring with a spring constant of 200 n/m moves in simple harmonic motion. find the period of the oscillations.
By angular speed, the period of oscillation is 0.63 second.
We need to know about the angular speed of harmonic oscillation. the angular speed can be determined as
ω² = k / m
where ω is angular speed, k is spring constant, and m is the mass.
The angular speed can be calculated by
ω = 2π/T
Hence,
ω² = k / m
(2π/T)² = k / m
where T is period.
From the question above, we know that:
m = 2 kg
k = 200 N/m
By substituting to the equation, we get
(2π/T)² = k / m
(2π/T)² = 200 / 2
(2π/T)² = 100
square root
2π/T = √100
T = 2π / √100
T = 0.63 second
Find more on angular speed at: brainly.com/question/6860269
#SPJ4
22. сс Peter exerts a horizontal force of 500 N on a box of mass 2.0 kg which also experiences a friction force of 200 N. If it takes 4.0 s to move the box 3.0 m, what is the efficiency in moving the box? Efficiency 2 Energy coming in energy going X 100 %. (c) ABUD 29% 40% 60% 71% FH301/P1/19 ont.
The efficiency of moving the box is 60%.
Given in the question
Force exerted by peter = 500 N
Force due to friction on box = 200 N
Distance Traveled by box = 3 meters
Now work done by the force is given by
Work Done = (Magnitude of Force) × (Distance traveled)
Let us find work done by each force,
Work done by peter
Work Done = (Magnitude of Force) × (Distance traveled)
Put in the value, we get
Work Done =500 × 3
Work Done by peter = 1500 J
Similarly, Work done by friction
Work Done = (Magnitude of Force) × (Distance traveled)
Put in the value, we get
Work Done =200 × 3
Work Done by Friction = 600 J
As we know the work done by friction force is always negative,
Work Done by Friction = -600 J
So, net Work done = Work Done by peter + Work Done by Friction
net Work done = 1500 - 600
Net Work done = 900 J
Now Efficiency = (Net work done/work done by peter) × 100
Put in the values, we get
Efficiency = (900/1500) × 100
Efficiency = (3/5) × 100
Efficiency = 300/5
Efficiency = 60 %
So, the efficiency of moving the box is 60%.
LEARN MORE ABOUT WORK AND ENERGY HERE:
https://brainly.com/question/25959744
#SPJ9
A ball is thrown straight up into the air with a velocity of 63. 7 m/s. What is the velocity after 3s?
The ball that is thrown straight up into the air with a velocity of 63. 7 m/s after 3s will have a velocity of: 34.3 m/s
The formula for the vertical launch upward and the procedure we will use is:
vf = v₀ - g * t
Where:
v₀ = initial velocityg = gravityt = timevf= final velocityInformation about the problem:
g = 9.8 m/s²v₀ = 63. 7 m/st = 3 svf =?Applying the final velocity formula we get:
vf = v₀ - g * t
vf = 63. 7 m/s - 9.8 m/s² * 3 s
vf = 63. 7 m/s - 29.4 m/s
vf = 34.3 m/s
What is vertical launch upwards?In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.
Learn more about vertical launch at: brainly.com/question/13962796
#SPJ4
What weight of the ore in lb would contain exactly 1lb of copper
The density of crushed iron ore is equivalent to 2 500 kg/m3, or 2.5 grams per cubic centimeter, which is the weight of the material. The density is equal to 156.07 pounds per cubic foot in either the Imperial or US customary measuring systems.
When weights are expressed in kilograms of air, the air gives buoyancy, and because a kilogram of copper has a larger volume than a kilogram of lead, it displaces more air and hence receives more support. As a result, on a scale in the air, a kilogram of lead will weigh more than a kilogram of copper. Copper has a density of 8.94 grams per cubic centimeter, or 8 940 kilograms per cubic meter, or 20°C (68°F or 293.15K), at ordinary atmospheric pressure.
Learn more about weight here-
https://brainly.com/question/10069252
#SPJ9
Two long, parallel conductors, separated by 10.0cm, carry currents in the same direction. The first wire carries a current I₁ = 5.00A, and the second carries I₂ = 8.00 A. (b) What is the force per unit length exerted by I₁ on I₂ ?
The force per unit length exerted by I₁ on I₂ is [tex]8\times10^-^5 \ N/m[/tex] .
Two long parallel conductors separated by a distance 'r' having current [tex]I_1[/tex] and [tex]I_2[/tex] have force per unit length which is given by [tex]f=\frac{u_0I_1I_2}{2\pi r}[/tex] .....(1) where [tex]u_0[/tex] is permittivity of free space whose value is [tex]4\pi \times10^-^7Tm/A[/tex]
It is given that two long, parallel conductors, separated by 10.0cm having current I₁ = 5.00A and I₂ = 8.00 A.
If the current flowing through the wire are in same direction then they the wire attract each other and if the current flowing through the wire are opposite in direction then they the wire repel each other
Putting r = 10.0cm [tex]=10\times10^{-2}m[/tex] , I₁ = 5.00A and I₂ = 8.00 A in equation (1) , we get
[tex]f=\frac{4\pi \times10^-^7\times5.00\times8.00}{2\times\pi\times10.00\times10^{-2}}\\\\f=\frac{2\times40\times10^-^5}{10} \\\\f=8\times10^{-5}N/m[/tex]
Learn more about force per unit length here :
https://brainly.com/question/15071504
#SPJ4
reduction in cerebral blood flow in areas appearing as white matter hyperintensities on magnetic resonance imaging author links open overlay paneladam m.brickman
Answer: Conclusion White matter hyperintensities predict an increased risk of stroke, dementia, and death. Therefore white matter hyperintensities indicate an increased risk of cerebrovascular events when identified as part of diagnostic investigations, and support their use as an intermediate marker in a research setting