A tennis ball with a speed of 23.7 m/s is
moving perpendicular to a wall. After striking
the wall, the ball rebounds in the opposite
direction with a speed of 15.2865 m/s.
If the ball is in contact with the wall for
0.0145 s, what is the average acceleration of
the ball while it is in contact with the wall?
Take “toward the wall” to be the positive
direction.
Answer in units of m/s

Impoundment or dams are used to collect the water to enhance the amount of running water. Gravity is used to direct water down a pen stock pipe from a hole in the dam. The turbine is spun by the flowing water, and this rotation of the magnets inside the generator produces power.

Hydroelectric energy, also known as hydroelectric power or hydroelectricity, is a type of energy that uses the force of moving water to produce electricity, such as water running down a waterfall. This force has been utilized by people for ages. Greeks have been grinding wheat into flour for over 2,000 years by using flowing water to turn their mill's wheel.

The majority of hydroelectric power plants feature a water reservoir, a gate or valve to regulate the amount of water that flows out of the reservoir, and an outlet or location where the water ends up after flowing downstream. Just before water rushes over the top of a dam or cascades down a hill, it gains potential energy. Water flowing downhill changes potential energy into kinetic energy. When a turbine's blades are turned by water, electricity is produced and sent to the power plant's users.

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The strength of the electrostatic force is inversely proportional to the square of the distance

between the charges. If the distance is doubled, the force is 1/4.

The new force is 0.80/4 = 0.20 N.

Electrostatic force is the attractive or repulsive force that exists between two charged particles. Also known as Coulomb interaction or Coulomb force. For example, the electrostatic forces between the protons and electrons of an atom are responsible for the stability of the atom.

The force acting along a line joining two point charges is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them.

[tex]F=K |\frac{q_{1} q_{2}}{r^{2} } |[/tex]

In the above formula, k is arbitrary and can be chosen to be any positive value. Since k is a constant, I chose to give the value of k as follows:

Therefore, with q₁ and q₂ values ​​of 1 and r = 1 (two charges with 1 Coulomb charge each at a distance of 1 m), we get F = [tex]9 \times 10^9[/tex] N. In the above equation, ε₀ is given as the permittivity of free space and its value in SI units is [tex]8.854\times10^{-12} C^{2} N^{-1} m^{-2}[/tex].

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Answer:

Self demagnetization means when magnets' poles are free (suspended) for too long, their magnetic attraction becomes weaker and thus, self demagnetizes.

It does not violate the principle of  relativity because the speed of the electron in water can explained as its relative speed with water.

The principle of relativity states that there is no physical way to differentiate between a body moving at a constant speed and an immobile body.

If the speed of light in water is 230Mm/s and an electron is moving through water at 250 Mm/s, it does not violate the principle of  relativity because the speed of the electron in water can explained as its relative speed with water.

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Answer:

1. A

2. D

3. B

4. C

Explanation:

1. A- Aristotle thought that the Earth was flat and that anyone who sailed off the edge of the ocean would fall of Earth, this theory of course later got disproved by Kepler and other scientists

2. D- Kepler suggested the modern model of the Solar System because after months and months of looking out the telescope and making models of the Solar System, Kepler finally made the conclusion of the official Solar System.

3. B- Egyptians thought did not move and all the planets, including the sun revolved around it. Later, Kepler disproved this theory with the modern Solar System.

4. C- This is the path that planets follow to revolve around the Sun. People first thought that planets moved in a circular motion but actually they moved in a ellipse because the Sun's gravity pulled planets closer at some parts more than others.

The resultant wave is calculated by adding the magnitude of both the waves traveling in same direction.The resulting wave is of the amplitude 5.66cm or 5.66 x 10⁻²m

Let us take A be the amplitude of both the waves that are travelling

We are given that waves are moving 90 degrees out of the phase

Let the equations of the waves be

y1= Asin(ωt-kx)

y2=Acos(ωt-kx)

Since the waves are ninety degrees travelling out of phase ,

The resultant wave is

y=y1+y2

  = Asin(ωt-kx) +Acos(ωt-kx)

  =√2 A sin(ωt-kx+π/4)

So, we can conclude resultant wave is √2A = √2 *4 =5.66cm

=5.66* 10 ⁻²m

Hence the resultant wave is 5.66cm

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Answer: 1) D & 2) H

Explanation:

D. Tropical rainy &

H. Long-term average temperature  and precipitation for the area

The EMF that will be produced is 13.3 V

EMF is an acronym for Electromotive Force which can be defined as the potential difference between the terminals of a cell when it is not delivering any current in an external circuit.

Given that a generator produces 24.0V when turning at 900 rev/min. What EMF does it produce when turning at 500 rev/min?

The EMF produced by a generator is proportional to the angular speed at which the generator turns. That is, E [tex]\alpha[/tex] w

E1/E2 = W1/W2

24/E2 = 900/500

Reciprocate both side.

E2/24 = 500/900

E2 = 0.5556 x 24

E2 = 13.33 V

Therefore, the EMF that will be produced is 13.3 V

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The speed at which Matt ran is 10 miles per hour. Therefore, option (B) is the correct answer.

Matt runs at a speed of x miles per hour, whereas Doug does it at a speed of 2 miles per hour faster. Doug's speed will thereafter be equal to x + 2 miles per hour. Since there are four quarter-mile laps, Doug completes 1.5 miles in the time it requires Matt to complete 1.25 miles.

Matt:

Speed = x

Distance = 1.25

Time = [tex]\frac{1.25}{x}[/tex]

Doug:

Speed = x+2

Distance = 1.5

Time = [tex]\frac{1.5}{x+2}[/tex]

Making an equation by putting the two timings on the chart equal to one another and then solving for x will reveal that the two boys took the same amount of time from the moment Doug started.

[tex]\frac{1.5}{x+2}[/tex] = [tex]\frac{1.25}{x}[/tex]

1.5x = 1.25 (x+2)

0.25x = 2.5

x = 10

Therefore, Matt’s speed is 10 miles per hour.

The complete question is:

Doug, who runs track for his high school, was challenged to a race by his younger brother, Matt. Matt started running first, and Doug didn’t start running until Matt had finished a quarter-mile lap on the school track. Doug passed matt as they both finished their sixth lap. If both boys ran at a constant speed, with Doug running 2 miles an hour faster than Matt, what was Matt’s speed?

A. 10.5 miles per hour

B. 10 miles per hour

C. 9 miles per hour

D. 8 miles per hour

E. 7.5 miles per hour

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The total voltage across resistor- three in the circuit is 24V

acc to ohm's law

the electrical current flowing through any circuit is directly proportional to the voltage applied across it.

i.e. V ∝ I

V= IR

I = current

v = voltage

R = resistance (proportionality constant)

R in parallel

(1/Rp = 1/R1 + 1/R2 + 1/R3 +1/R4)  

on rearranging the above equation (V=IR)

I = V/R

I = 24/6 = 4A

I is the current in each resistor.

in the parallel circuit voltage across the component is same and total current is the sum of the current  flowing through each component.

the total voltage across resistor-three (vr3) in the circuit is

V= IR₃ = 4×6= 24 volt

the total voltage across the resistor three (vr3) in the circuit is 24volt.

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Hence , the rise and fall of the amplitude of the sound causes the variation from loud to soft .

The variation from loud to soft sound created by a twin-engine craft may be explained by the idea of formation of beats.

When 2 sound waves of nearly equal frequencies square measure created at the same time, then the intensity of the resultant sound created by their superposition will increase and reduces as an alternative with time. This increase and reduce within the intensity of sound square measure referred to as the development of beats.

Let us suppose that at a specific time the 2 waves of slightly totally different frequencies square measure in section, i.e. the crest of the primary wave falls on the crest of the second wave, thus at this point the resultant amplitude is most, therefore we tend to hear a louder sound. however since there's a small variation in frequencies there comes a time once the 2 waves square measure out of section, I.e. the crest of 1 wave falls on the trough of the opposite, here the resultant amplitude becomes zero and that we hear no sound. This rise and fall of amplitude continue and what we tend to hear could be a beat. Similar is that the case in an exceedingly twin-engine craft which ends within the variation of loud and soft sound.

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Answer:

The primary mirror in a telescope is curved so that it changes the path of the light hitting its surface.

Explanation:

Brainliest please

Answer:

the primary mirror in a telescope is curved because it changes the path of the light hitting its surface.

Answer:

Explanation:

In a series curcuit Current is divided across the resistors meaning the more you add resistors the more current is taken. The formula I= V/R also makes it easier to understand. The resistance is in the denominator. The more you increase it the more the current decreases.

Keep in mind Adding more resistors in a series curcuit reduc current.

Answer:

Explanation:

always accerelation it measures in m/second sguared.

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

When a wave encounters an obstacle or a slit that is comparable in size to its wavelength, it bends around it. This characteristic is called diffraction.

The term 'diffraction' was coined by an Italian scientist named Francesco Grimaldi Maria in 1660 when she first recorded accurate observations of this phenomenon. Diffraction is a wave phenomenon that describes the bending of waves when it encounters an obstacle or a slit. It is more pronounced when the obstacle or slit the wave encounters is in comparable size to its wavelength.

Diffraction occurs in all waves, including light, water waves, sound waves, electromagnetic waves like X-rays and even gravitational waves. In recent years, it has been observed that matter also demonstrates this wave-like property, but only at the atomic and subatomic level.

Diffraction can be observed in everyday life. The rainbow pattern seen on CDs and DVDs is as a result of diffraction of light. It can also be observed in ocean waves as they diffract around rocks, jetties and other obstacles.

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When we change the amplitude of the pendulum, the period does not change when we change the amplitude of the pendulum.

A pendulum is device that could be used to show oscillatory motion. The motion of the pendulum is that of an object that is tossed from one side to another. Typically, the simple pendulum is used in most school labs to show a motion that is regular and repeating.

Now we know that the amplitude refers to the point of highest displacement of the pendulum. The point of the highest displacement would depend on the angle at which the pendulum was displaced. The period has to do with the time that it takes for a particular pendulum to complete a full cycle.

We know that the period of the pendulum does not have an effect on the amplitude of the pendulum. It then follows that; When we change the amplitude of the pendulum, the period does not change when we change the amplitude of the pendulum.

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Answer: it remains the same

Explanation:

the frequency of a sound wave cannot change as it crosses the water-air boundary

Starting from rest, a boulder rolls down a hill with constant acceleration and travels 4.00 m during the first second, 8 m first it is moving.

Speed increase is the name we provide for any cycle where the speed changes. Since speed is a speed and a heading, there are simply two different ways for you to speed up: change your speed or shift your course — or change both. In mechanics, speed increase is the pace of progress of the speed of an item as for time. Speed increases are vector amounts (in that they have size and heading). The direction of an article's speed increase is given by the direction of the net power following up on that item. The extent of an articles. An item's typical speed increase throughout some undefined time frame is its adjustment of speed, partitioned by the span of the period.  Numerically, Momentary speed increase, in the meantime, is the constraint of the typical speed increase over a microscopic time period. In the terms of analytics, immediate speed increase is the subsidiary of the speed vector regarding time.

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The distance below the center of the board where the dart hits is 0.00056 m.

The distance below the center of the board reached by the dart is calculated as follows;

v² = u² + 2gh

where;

The initial vertical velocity of the dart = 0

v² = 0² + 2gh

v² = 2gh

h = v² /2g

h = (v sinθ)²/2g

where;

h = (1.2 x sin355)²/(2 x 9.8)

h = 0.00056 m

Thus, the distance below the center of the board where the dart hits is 0.00056 m.

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In the electron-transport chain, as electrons move along a series of carriers, they release energy that is used to pump protons across a membrane.

In plants and animals, the electron transport chain refers to the consistent streaming of electrons between cells where electron donors donate electrons and electron acceptors accept electrons through a redox reaction.

An electrochemical gradient is created as a result of the redox reaction and ATPs are produced.

In this chain, there are 4 major protein complexes that are transferred across the plasma membrane.

This cellular process occurs in mitochondria and is responsible for photosynthesis and cellular respiration. Its primary steps are Krebs' cycle, glycolysis, oxidative phosphorylation, and pyruvate oxidation.

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The pair of forces include;

Normal force of mass 1 on mass 2(F₁₂) and the reaction of mass 2 on mass 1 (F₂₁)

Normal force of mass 2 on the table A (F₂A) and the reaction of the table on the mass 2 (FA2).

The normal force is an everyday force that is felt when a surface pushes against an object that is placed on that surface.

Normal force acts in opposite direction to the weight of the object.

Based on Newton's third law of motion, for every action, there is an equal and opposite reaction.

The downward force exerted on the table, is equal to the reaction of the table on the masses.

The pair of forces acting on the masses stacked together include the following;

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The magnitude of the force on the test charge is 1.

Greatness is the quantitative worth of seismic energy. It is a particular worth having no connection with distance and heading of the focal point. The idea of extents traces all the way back to the Ancient Greeks, when stars overhead was sorted into six sizes. Extent alludes to the evaluating of the splendor of stars, the first being the most splendid. It has been moved to different issues since basically the seventeenth 100 years. In Physics, greatness is characterized as the most extreme degree of size and the course of an item. Greatness is utilized as a typical consider vector and scalar amounts. By definition, we realize that scalar amounts are those amounts that have size as it were.

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The net electric flux is not dependent on the volume of the cube and hence no change to the electric flux.

According to Gauss law, which states that the electric flux is defined as the electric field multiplied by the area of the surface in a plane perpendicular to the field.

Φ=Q ϵo

Where;

Q is enclosed charge

ϵo is the permittivity of the free space

According to the above gaussian relation, If the volume of the cube is doubled, then flux will neither be doubled or changed. It remains the same. This is because there is no direct relationship between the total flux and volume of the cube in the electric field. This means that there is no change to the electric flux.

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Initial speed for the toys snake will be 122.88 m/s

Given,

Height from where it has been dropped, h = 115 m

Height where the toy lands, s = 595 m

As we know that [tex]t = \sqrt{\frac{2h}{g} }[/tex]

here 'g' is acceleration due tp gravity = 9.81 m/s²

therefore  [tex]t = \sqrt{\frac{2 * 115}{9.81\\ }[/tex]

[tex]t = \sqrt{23.445}[/tex]

t = 4.842 s

Now, According to the Second Equation of the Motion which relates distance with the acceleration and time, we can say that

[tex]S = ut + \frac{1}{2}at^{2}[/tex]

The toy snake is thrown horizontally, therefore acceleration acting on the toy will be zero (0).

s = 595 m

t = 4.842 s

therefore [tex]u = \frac{s}{t}[/tex]

[tex]u = \frac{595}{4.842}[/tex]

u = 122.88 m/s

The initial speed of the toy snake will be 122.88 m/s.

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The electric field on the axis of the ring at the center of the ring at 100.00cm is 6.64×〖10〗^5N/C

Where a positive charge (q) is given, always note that the charges are pointing away from the electric field. The expression used to calculate the electric field away from the center of the ring is given by the equation below,

E=(K_e×b)/(r^3×Q)

Given that;

E = Electric field

Ke = electric field constant

a = radius of the charge q from the center of the circle

Q = electric charge = 75.0μC

The radius of the charge is a = 10cm= 0.1m

Distance from the electric field is 100cm = 1m

Ke is a constant given as 8.99×〖10〗^(9) Nm^2/c^2

E=(8.99×〖10〗^(9  ) Nm^2/c^2×1)/(〖0.1〗^3×75×〖10〗^(-6) )

E=6.64×〖10〗^5N/C

Therefore, the electric field away from the center of the ring is 6.64×〖10〗^5N/C away from the center of the ring.

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Answer:Never stand or move around while music is being performed.

Explanation:

Answer:

Mass

No matter where an object is in the universe, the more matter an object has, the more mass it will have as well.

The correct responses are;

1) The velocity is 15.0 m/s

2) The net force is 25 N and the acceleration is 1.25 m/s/s due east.

3) The distance covered is 63 m

4) The kinetic energy is  900000 J.

5) The greatest momentum is displayed by a baseball hit with a net force of 10.0 N for 3.0 s

6) The force is now is  one-ninth of the original amount.

7) The data that Carter and Sam want to find out is the  Instantaneous speed

8) The appropriate formula is change in velocity/change in time

The term momentum has to do with the product of the mass and the velocity of a body.

1) We know from the principle of the conservation of momentum that the momentum before collision is the equal to the magnitude of the momentum after Collison in a closed system thus;

3.4 *  23.9 m/s = (3.4 + 2) v

v = 3.4 *  23.9 m/s / (3.4 + 2)

v = 15.0 m/s

2) Mass of the box = 196/9.8 = 20 Kg

The net force that acts on the box = 75 N - 50 N = 25 N

Acceleration =  25 N/ 20 Kg

= 1.25 m/s/s due east.

Thus, the net force is 25 N and the acceleration is 1.25 m/s/s due east.

3) v^2 = u^2 - 2as

v = 0 m/s

u^2 = 2as

s = u^2/2a

s = (25 m/s )^2/ 2 *  5 m/s2

s = 63 m

The distance covered is 63 m

4) Kinetic energy = 1/2 mv^2 = 0.5 * 2000 * (30)^2

=  900000 J

The kinetic energy is  900000 J.

5) The greatest momentum is displayed by a baseball hit with a net force of 10.0 N for 3.0 s

6) The new magnitude of the force between them is  one-ninth of the original amount.

7) The data that Carter and Sam want to find out is the  Instantaneous speed

8) The formula that should be used is change in velocity/change in time.

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