Answer:
2.66secs
Explanation:
To get the time it will take to reach the ground, we will use the equation of motion;
S = ut + 1/2at²
S is the distance
u is the initial velocity
g is the acceleration due to gravity
Given
S = 30m
u = 0m/s
Let's get the acceleration
According to newton's second law;
[tex]\F_x = ma_x\\F_m - F_f = ma_x\\mgsin \theta - 0 = ma_x\\gsin\theta = a_x\\a_x = 9.8sin 60\\a_x = 9.8(0.8660)\\a_x = 8.49m/s^2[/tex]
Get the required time:
Recall that: S = ut + 1/2at²
Substitute the given parameters and find t
30 = 0(t) + 1/2(8.49)t²
30 = 4.24t²
t² = 30/4.24
t² = 7.08
t = √7.08
t = 2.66secs
Hence it take the box 2.66seconds to reach the ground
The tension of a guitar string is increased by 40%. By what factor odes the fundamental frequency of vibration change? a. 1.13 b. 1.18 c. 1.06 d. 1.09 e. 1.24
Answer:
b. 1.18Explanation:
The fundamental frequency in string is expressed as;
F1 = 1/2L√T/m .... 1
L is the length of the string
T is the tension
m is the mass per unit length
If the tension is increased by 40%, the new tension will be;
T2 = T + 40%T
T2 = T + 0.4T
T2 = 1.4T
The new fundamental frequency will be;
F2 = 1/2L√1.4T/m ..... 2
Divide 1 by 2;
F2/F = (1/2L√1.4T/m)/1/2L√T/m)+
F2/F = √1.4T/m ÷ √T/m
F2/F = √1.4T/√m ×√m/√T
F2/F = √1.4T/√T
F2/F = 1.18√T/√T
F2/F = 1.18
F2 = 1.18F
Hence the fundamental frequency of vibration changes by a factor of 1.18
When a capacitor, in RC circuit, is fully charged, the current through the resistor is Select one: zero if it is the only capacitor, but maximum if there is another capacitor in series with it. At its maximum value. Greater than the current in a resistor that is farther from the battery than the capacitor. Zero. Equal to the current in a resistive circuit in parallel with the capacitor circuit.
Answer:
The correct option is "Zero". A further explanation is given below.
Explanation:
As we know,
The capacitor is given by:
⇒ [tex]Q=C\times V[/tex]
Rate of change with respect to the time will be:
⇒ [tex]\frac{dQ}{dt}=C\times \frac{dV}{dt}[/tex]
Now,
It is mentioned in the question that the capacitor is completely charged, then
⇒ [tex]\frac{dV}{dt}=0[/tex]
i.e.,
⇒ [tex]\frac{dQ}{dt}=0[/tex]
All other choices available aren't related to that same scenario in question. So the answer above is the perfect one.
The Earth's _____
is what gives us day and night
1. Orbit
2. Rotation
3.Revolution
Answer:
rotation
Explanation:
............................
Answer: 2nd option, Rotation
I hope this helps, and Stay Safe! :)
Uses of Photodiode.State the 8 uses of phototide...................
Answer:
Photodiodes are used in consumer electronics devices such as compact disc players, smoke detectors, medical devices and the receivers for infrared remote control devices used to control equipment from televisions to air conditioners. For many applications either photodiodes or photoconductors may be used.
A car’s brakes decelerate it at a rate of -1.70 m/s2. What is the time, in seconds, required to slow the car from 15 m/s to 9.0 m/s?
Answer:
t = 3.52 s
Explanation:
Given that,
The deceleration of a car is, a = -1.7 m/s²
The initial velocity of the car, u = 15 m/s
Final velocity of the car, v = 9 m/s
We need to find the time that is required to slow the car from 15 m/s to 9 m/s. The definition of acceleration is :
[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{9-15}{-1.7}\\\\t=3.52\ s[/tex]
So, it will take 3.52 seconds to slow the car from 15 m/s to 9 m/s.
What is the net force of the object below
A. 17 N right
B. 0 N
C. 3 N right
D. 3 N left
Answer:
Concept: Physics
So we have forces in the Fx planeWe do sum of Fx= 0 Next we establish F-f So 10N- 7N = 3N to the rightA car that experiences no frictional force is started and caused to move. For the car to continue in that motion, the gas pedal would have to be used:
Explanation:
Gas pedal is not required to used on friction less surface. On a friction less surface once the car is started and caused to move, car continues to move with same velocity as there is no opposing force. Therefore, no pressing of gas pedal required. However, this situation is not possible in real life, as friction is always present.
A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of _____.
Answer:inertia
Explanation:
A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of the principle of Inertia.
What is newton's first law of motion?
It states that" When a body s at rest it remains at rest, and IF the body is in motion It remains in motion until an external force is applied to that object."
i.e
If F=0, Then v= constant
and when that constant =0 then the body is at rest.
Where F= force
v = velocity.
Inertia is the tendency of an object to resist changes in its state of motion. In this case, the car was moving at a certain speed before it hit the tree, and because of its inertia, it continued to move forward even after the collision with the tree.
The car only stopped when another force acted on it, such as the force of the tree, or the force of friction with the ground, which slowed it down and eventually brought it to a stop. The severe damage to the car was a result of the force of the impact, which was a combination of the car's speed and its mass.
Hence the car does not stop because of the principle of inertia.
To learn more about Inertia click:
https://brainly.com/question/3268780
#SPJ3
how do you test hydrogen gas
Explanation:
The test for hydrogen consists of holding a burning splint held at the open end of a test tube of gas. If the gas is hydrogen it burns with a loud “squeaky pop” which is the result of the rapid combustion of hydrogen with oxygen to produce water.
List the three main things necessary to build an electromagnet.
Answer:
Electromagnets are special types of magnets that are made by passing current through coils of wire. To make an electromagnet, the minimum requirements are:
1. A nail (usually made of iron, steel or zinc)
2. Dry cell batteries
3. Wire (Usually copper wire)
Other things could be:
1. Electric tape to hold both ends of the wire properly at the battery terminals.
2. Scissors to cut the wire into desired length.
3. Iron fillings for testing purposes.
What’s the kinetic energy of the object? Use. Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot’s kinetic energy is_____ joules.
Answer:
4 kilograms
Explanation:
****PLEASE HELP**** THERE ARE TWO QUESTIONS (ITS EASY)
but I think it's a and f
and
b and e
Why do adults make bigger splashes when they jump into swimming pools than small children?
Answer:
it bc the adults are bigger then us kid so when they dip in the pool it makes bigger splashes
Explanation:
a transformer is used to provide a pd of 100kV to an xray tube from 250V a.c mains supply. A current of 100mA flows in the x ray tube and the transformer is 100% efficient. calculate the ratio of the number of turns in the secondary coil to the number of turns in the primary coil.
Answer:
9726
Explanation:
she tried oii oii oii ooe last kow show e
A transformer is used to provide a pd of 100kV to an xray tube from 250V a.c mains supply. A current of 100mA flows in the x ray tube and the transformer is 100% efficient. the ratio of the number of turns in the secondary coil to the number of turns in the primary coil is 9726.
What is transformer?
A transformer is an electrical device that transfers energy from one electric circuit to another using the electromagnetic induction principle.
It is intended to change the AC voltage between the circuits while keeping the current's frequency constant. Transformers accomplish this without establishing a conductive link between the two circuits.
The magnetic core, the primary winding, and the secondary winding are the three components that make up a simple transformer. A live supply of AC power is connected to the primary winding. The winding is encircled by an oscillating magnetic field as a result.
Therefore, A transformer is used to provide a pd of 100kV to an xray tube from 250V a.c mains supply. A current of 100mA flows in the x ray tube and the transformer is 100% efficient. the ratio of the number of turns in the secondary coil to the number of turns in the primary coil is 9726.
To learn more about transformer, refer to the link:
https://brainly.com/question/15200241
#SPJ2
Please help!
A pulley system is hanged in a lift as shown below in the
figure. A and B are two masses each having m and 2m mass
respectively. If d is the distance from the floor to B and the
lift starts to move with acceleration a, the time taken by B to reach the floor is,
1)
[tex] \sqrt{ \frac{6d}{(g + a)} } [/tex]
2)
[tex]\sqrt{ \frac{6d}{g} }[/tex]
3)
[tex]\sqrt{ \frac{6d}{(g - a)} }[/tex]
4)
[tex] \frac{6d}{( g+ a)} [/tex]
5)
[tex]\sqrt{ \frac{2d}{(g + a)} }[/tex]
Answer:
B
Explanation:
Find the acceleration of the system
m2>m1
further m2 = 2m
and m1 = m
The acceleration is going to be the downward force created by m2 divided by the total mass (m2 + m2)
a = (m2*g - m1*g) / (m1 + m2)
a = (2m - m)*g/ (2m + m)
a = m * g/3m
a = 1/3 * g
Formula for time
Givens
distance := d
acceleration : = a
vi = 0
Kinematic Formula
d = vi * t + 1/2 a t^2
Solution
d = 0 + 1/2 * 1/3 g * t^2
6d = g * t^2
t^2 = 6d/g
t = √(6d/g)
Answer.
B
how can a simple machine lift a heavy load with smaller effort
Answer:
The axle is fixed to a frame or a block. The pulley is normally fixed to a support above the load. The load is tied to one end of the rope and the effort is applied at the other end. Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort.
May be this will help U
Answer:
The axle is fixed to a frame or a block. The pulley is normally fixed to a support above the load. The load is tied to one end of the rope and the effort is applied at the other end. Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort
Explanation:
Release an object from a distance of 2 meters. If the object reaches the ground at a speed of 20 m / s. Find the acceleration of the object?
Applicate formula:
Vf² = Vo² + 2ad
Clearing a:
a = (Vf² - Vo²) / 2d
Replacing:
a = ((20 m/s)² - 0 m/s)²) / 2 * 2 m
a = 400 m²/s² / 4 m²
a = 100 m/s²
The aceleration is 100 m/s²
In terms of the scientific definition of work, magnetic and electric fields can do work.
Answer:
i think yes if right or wrong comment me ok
when the mass of an object is increased it would decrease its acceleration in the force is left alone
Answer:
See the explanation below.
Explanation:
This analysis can be easily deduced by means of Newton's second law which tells us that the sum of the forces or the total force on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
F = total force [N]
m = mass [kg]
a = acceleration [m/s²]
We must clear the acceleration value.
[tex]a=\frac{F}{m}[/tex]
We see that the term of the mass is in the denominator, so that if the value of the mass is increased the acceleration decreases, since they are inversely proportional.
Assume that Michael's teacher has a rule that if a student talks out-of-turn three times in one day, that student must stay in for recess for the
rest of the week. Which of the following methods is she using to control student behavior?
a. folkway
b. sociobiology
c. informal sanction
d. formal sanction
2. __________is the pressure exerted by the layer of air around the Earth
Answer:
Atmospheric Pressure
Explanation:
Explain what happen to pressure exerted by air in the tyre if the temperature of tyre increases
Answer:
See the answer below
Explanation:
According to Amonton's law, the pressure of a gas is directly proportional to the temperature of its molecules given that the volume remains constant.
Hence, if the temperature of a tyre increases, heat is transferred to the air molecules within the tyre leading to an increase in the air temperature. The air thus exerts more pressure on the tyre in agreement with Amonton's law.
A ball is kicked by an offensive player and hits the goal post and comes back to the person who kicked it and he/she kicks it in the goal. It is ruled ______.
Answer:
A goal.
Explanation:
This is clearly seen to be a scenario of a sporting event. It is seen to have certain set down rules that it is been strictly played by. In different occasions, it is seen to favour an opposing or defending side. In the case here where the ball did not touch or foul anyone after its hit on the woodwork, and been shot into the net, it can be counted to be a goal. There are different rules which ranges from penalty to offsides, to throw-in etc which makes the game lively and controlled very well.
2. A force of 50 N is applied to the object for a distance of 2.0 m. Assume that object（the mass of the object is 3kg）
was at rest at the beginning, what speed did it achieved because of the work done on it? (Hint:
Calculate the works performed by the force first.)
I figured that is 8.2m/S，I am just not sure can anyone help me i much appreciate it.
Answer:
2. A force of 50 N is applied to the object for a distance of 2.0 m. Assume that object（the mass of the object is 3kg）
was at rest at the beginning, what speed did it achieved because of the work done on it? (Hint:
Calculate the works performed by the force first.)
I figured that is 8.2m/S，I am just not sure can anyone help me i much appreciate it.
PLEASE HELP, MAJOR, brainest if correct
01
Question 4
What is an atom's nucleus made of?
X a. protons only
b. only neutrons
c. electrons and protons
d. protons and neutrons
Answer:
D i think
Explanation:
dont need a explanation it's just D
a 10-kg box is sitting at rest on a table. What is the net force acting on the box?
Answer:
the net force /resultant force is 0N
Explanation:
this is because newton's first law states that when there was no resultant force, the object will continue in its state of rest or uniform motion in a straight line.
as a result, the box is at rest. this the net for certain which is the resultant force is 0N, this doesn't mean that there is no force, it is just that the total force (after subtracting) is 0N
hope this helps,
1. A car travels 180 m southeast in 30 s. What is the average velocity? (Lesson 2.01)
Show your work and include units.
Step 1: write formula
Step 2: list “givens”
Step 3: plug in numbers
Step 4: calculate & write answer
Step 5: add units
i
Answer:
6m/s
Explanation:
Velocity (m/s) = Displacement (m) / Time (s)
Given:
Displacement = 180m
Time = 30s
Velocity = 180/30 = 6m/s
The diameter of Circle A is _________. EF AG EG FG
Answer:
The diameter is EF
Explanation:
Given
Circle A (See attachment)
Required
Determine the line that represents the diameter
First, it should be noted that the diameter of a circle is always a straight line.
From the attachment, the circle has the following straight lines:
E FE AA GA FIt should also be noted that the diameter passes through the center of a circle and divides it into two congruent parts.
From the list of straight lines above, only line EF satisfy this property
Hence, the diameter of the circle is line EF.
Write the chemical formula and chemical name for two phosphorus and four fluorine.
Answer:
2 moles of phosphorus difluoride
2PFsubscript2
I hope it will be useful.