A tennis ball, 0.384 kg, is accelerated at a rate of 187 m/s2 when hit by a professional tennis player. What force does the player's tennis racket exert on the ball?

Answer:

Vf = 25.7 [m/s]

Explanation:

To solve this problem we must use the following kinematics equation:

[tex]v_{f} ^{2}= v_{i} ^{2}-(2*a*x)[/tex]

where:

Vf = final velocity [m/s]

Vi = initial velocity = 30 [m/s]

a = desacceleration = 2 [m/s^2]

x = distance = 60 [m]

Note: the negative sign in the equation means that the car slows down.

Now replacing:

[tex]v_{f}^{2}=(30)^{2}-(2*2*60)\\ v_{f}^{2} = 660\\v_{f} =\sqrt{660} \\v_{f}=25.7[m/s][/tex]

The answers is 30 miles per hour, the driver is speeding the car up,     section-H, 12 minutes, section-D, and 65 miles per hour.

Answer

C. 0 N

F=ma=0.5(0)=0 N

Answer:

c

Explanation:

hope it helps

Answer:

magnitude and direction e.g acceleration,displacement

Answer:

It would be 2N pointing South.

Explanation:

Since the forces are going in opposite directions, you can subtract them. Which makes it 7N south minus 5N North. That is 2N pointing South. Because the force going south is greater, it is the direction the force will be going.

Answer:

Electrons are retained by the electromagnetic force in the orbit around the nucleus since the nucleus is positively charged in the middle of the atom and absorbs the electrons charged negatively.

Hope this helps!

We have that for the Question "Why do you think the electron of the hydrogen atom stays close to the proton in the atom’s nucleus" it can be said that

From the question we are told

Why do you think the electron of the hydrogen atom stays close to the proton in the atom’s nucleus?

Generally

This is because of the law of attraction where unlike charges reply

Therefore

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Answer:

increases

Explanation:

edgu2020

Increasing the amount of current that flows through a wire increases the strength of an electromagnet.

An electromagnet is a type of magnet that is created by running an electrical current through a coil of wire. Unlike permanent magnets, which have a fixed magnetic field that cannot be adjusted, the magnetic field of an electromagnet can be turned on and off or adjusted by controlling the amount of current flowing through the coil.

The strength of an electromagnet depends on several factors, including the number of coils in the wire, the amount of current flowing through the wire, and the type of core material used in the coil. Electromagnets are widely used in various applications, such as in electric motors, generators, relays, MRI machines, and particle accelerators.

One of the advantages of electromagnets is that their magnetic field can be easily controlled by adjusting the amount of current flowing through the wire. This makes them useful in applications where the magnetic field needs to be turned on and off, or where a variable magnetic field is required.

Another advantage of electromagnets is that they can be designed to be much stronger than permanent magnets. This is because the strength of an electromagnet is directly proportional to the amount of current flowing through the coil, which can be increased or decreased as needed.

Here in this question,

This happens because an electromagnet is created when an electric current flows through a wire, generating a magnetic field around the wire. The strength of the magnetic field depends on the amount of current flowing through the wire.

When more current flows through the wire, the magnetic field around the wire becomes stronger. This is because the magnetic field is directly proportional to the current flowing through the wire, as well as the number of loops of wire in the coil.

Therefore, increasing the current flowing through a wire in an electromagnet will increase the strength of the magnetic field, resulting in a stronger electromagnet.

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Answer:

I gonna give you the number so but you need to round 6.19047619048

Explanation:

Answer:

Velocity is measured by a change in position/time, so that makes it similar to speed. However, to fully clarify velocity, you need to include direction.

Explanation:

So you should have the right answer as selected in the picture.

Answer:

the answers are 2, 4, and 5.

Explanation:

Answer:

t = 2.55 s

Explanation:

Given that,

Height from which the baseball is thrown, h = 155 m

Initial velocity of the baseball, u = -25 m/s

We need to find the time taken by it to reach the ground. Let the time is t. Using equation of kinematics to find it as follows:

[tex]v=u+at\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{0-(-25)}{9.8}\\\\t=2.55\ s[/tex]

So, it will take 2.55 seconds to reach the ground.

Answer:

Energy is found only in moving objects : False

Energy is never created : True

Energy can move matter : True

Energy is the same as force : False

Energy is never destroyed : True

Explanation:

Plato

Energy can neither be created nor be destroyed. Energy is generated by both moving and stationary objects but in different forms. Energy can move matter. Hence, options 2, 3 and 5 are correct.

According to the law of conservation of energy, energy can neither be created nor be destroyed. However, it can be transformed from one state to the other. For example electrical energy can be converted to light energy.

Energy is generated in both stationary and moving object. The energy for a particle gained by its motion is called its kinetic energy. The energy stored on an object at rest is called potential energy.

Energy can move matter as well. The energy used to displace an object is called work done on the object. The unit of energy and work done  is joule. Therefore, options 2, 3 and 5 are correct.

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Answer:

is this a mudder question

Answer:

d

Explanation:

Answer:

Soln:

d=30m

t=3s

now:

v=d/t

=30/3

=10

Answer:

The true statement is;

(b) The rock takes about the same time to hit the water in each case

Explanation:

The given information are;

The direction in which the rock is kicked = Horizontally

The number of different initial horizontal with which the rock as kicked =  different horizontal velocity

The time taken for the rock to hit the water is given by the following equation for projectile motion;

y = y₀ + v₀× sin(θ₀)×t - 1/2×g×t²

Where;

θ = The angle the rock makes with the horizontal when it was kicked = 0

y = The height through which the rock drops

y₀ = The initial height of the rock

t = The time taken for the ball to hit the water

g = The acceleration due to gravity ≈ 9.81 m/s²

For the different speeds, v₁, v₂, and v₃, we have;

y = y₀ + v₁× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²

y = y₀ + v₂× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²

y = y₀ + v₃× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²

Therefore, the time it takes for the ball to hit the water is given as follows;

[tex]t = \sqrt{\dfrac{(y_0 - y) \times 2}{g} }[/tex]

Which is the same for each case

However, the speed, v, with which the rock hits the water is given by the following equation;

[tex]v = \sqrt{v_x^2 + v_y^2}[/tex]

[tex]v_y[/tex] = The vertical velocity = v₀ × sin(θ₀) - g×t = v₀ × sin(0) - g×t = -g×t

[tex]v_y[/tex] = -g×t

Therefore, [tex]v_y[/tex], is the same for all three times

While vₓ = v₁, v₂, and v₃, for each of the three times.

Therefore, [tex]v = \sqrt{v_x^2 + v_y^2}[/tex]  the speed with which the rock hits the water is different for all three times.

Answer:

maybe. inv me to slides and I'll try.

Explanation:

Answer:

If we forget about drag for a second then any object will accelerate at 9.8 m/s/s. The distance traveled is (9.8 m/s)/2 * (x seconds)^2, so solving for 45 meters the no-air fall will take 3.06 seconds and reach 30 m/s or 108 kph or 67.1 mph

Explanation:

Answer:

C. Capacitance

Explanation:

right on EDGE2021

Answer:

F = 600N

Explanation:

F = m x a

F = Force

m = mass

a = acceleration

F = 0.14 x 600 = 84N

Answer:

the innermost layer of the earth

Explanation:

the earth has an outer core liquid and an inner core solid they are not chemically distinct from each other but they are chemically distinct from the mantle the core is mainly composed of nickel and iron

Answer:

θ = 29.38°

Explanation:

The centripetal force is given by the formula;

F_c = F_n(sin θ) = mv²/r

Now, the vertical component of the normal force is; F_n(cos θ)

Now, this vertical component is also expressed as; F_n(cos θ) = mg

Thus, the slope is;

F_n(sin θ)/F_n(cos θ) = (mv²/r)/mg

tan θ = v²/rg

v² = rg(tan θ)

The initial speed will be gotten from the relation;

(v_o)² = μ_s(gr)

Plugging rg(tan θ) for (v_o)², we have;

μ_s(gr) = rg(tan θ)

rg will cancel out to give;

μ_s = (tan θ)

Thus, θ = tan^(-1) μ_s

μ_s is coefficient of static friction given as 0.563

θ = tan^(-1) 0.563

θ = 29.38°

Answer:

true 28%

Explanation:

;"/:;,*"# /hcrvuvf

Answer:

True - - - probably more than one-fourth aren't to be honest

Explanation:

Answer:

D

Explanation:

Answer:

The guy above me is wrong. The answer is actually...

(C.)

Answer: D. 4.4 m/s

Explanation:

Answer:The correct answer is 4.4 m/s but I will warn you, A p e x counted it WRONG when I gave this answer.

Explanation:

Answer:

Maybe pistil or ovary

pistil usually is located in the center of the flower and is made up of three parts: the stigma, style, and ovary

Answer:

A. Ovary

Explanation: