Which of the following equations accurately defines acceleration?

Plz help ASAP

Answer:21

Explanation:every body said

Answer:c

Explanation:c

This question involves the concepts of the time period, orbital radius, and gravitational constant.

The theoretical period of the moon is "658 hr".

The theoretical time period of the moon around the earth can be found using the following formula:

[tex]\frac{T^2}{R^3}=\frac{4\pi^2}{GM}[/tex]

where,

T = Time Period of Moon = ?

R = Orbital Radius = 3.84 x 10⁸ m

G = Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

M = Mass of Earth = 5.97 x 10²⁴ kg

Therefore,

[tex]\frac{T^2}{(3.84\ x\ 10^8\ m)^3}=\frac{4\pi^2}{(6.67\ x\ 10^{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)}\\\\T^2=(9.91\ x\ 10^{-14}\ s^2/m^3)(56.62\ x\ 10^{24}\ m^3)\\\\T=\sqrt{561.34\ x\ 10^{10}\ s^2}[/tex]

T = 2.37 x 10⁶ s[tex](\frac{1\ h}{3600\ s})[/tex]

T = 658 hr

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The attached picture shows the derivation of the formula for orbital speed.

to get weight multiply Mass by 9.8

weight =9.8x15=147N

Answer:

C. It keeps the electric current flowing in one direction.

Explanation:

just got it correct on my quiz.

The commutator in a DC generator keeps the electric current flowing in one direction option (C) is correct.

A direct current generator's principal job is to transform mechanical energy into electricity. Internal combustion engines, water, gas, steam turbines, and even hand cranks are all sources of mechanical energy for DC generators.

The commutator in a DC generator converts the alternate current into the direct current.

Thus, the commutator in a DC generator keeps the electric current flowing in one direction option (C) is correct.

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Answer:

Sheikh Hasina is the prime minister of Bangladesh.

Answer:

her name is Sheikh Hasina

Answer:

miu = 0.31

Explanation:

The friction force is defined as the product of the normal force by the coefficient of friction.

[tex]f=miu*N[/tex]

where:

f = friction force = 3 [N]

miu = friction coefficient

N = normal force [N]

The normal force on a horizontal surface can be calculated by means of the product of mass by gravity.

where:

m = mass = 1 [kg]

g = gravity acceleration = 9.81 [m/s²]

[tex]N=m*g\\N=1*9.81[/tex]

[tex]N= 9,81 [N][/tex]

Now replacing in the equation above, we can find the friction coefficient.

[tex]miu=3/9.81\\miu = 0.31[/tex]

Answer:

A = 0.188 m²

Explanation:

First we find the distance between the plates by using the formula of electric field intensity:

E = ΔV/d

d = ΔV/E

where,

d = distance between plates = ?

ΔV = Potential Difference = 4 KV = 4000 V

E = Electric Field = 2 x 10⁸ V/m

Therefore,

d = 4000 V/(2 x 10⁸ V/m)

d = 2 x 10⁻⁵ m

Now, we find the Area of Plates by using formula of capacitance:

C = A∈₀∈r/d

where,

C = Capacitance = 0.25 μF = 0.25 x 10⁻⁶ F

A = Area of Plates = ?

∈₀ = Permittivity of free space = 8.85 x 10⁻¹² C/N.m²

∈r = Dielectric Constant = 3

Therefore,

0.25 x 10⁻⁶ F = A(8.85 x 10⁻¹² C/N.m²)(3)/(2 x 10⁻⁵ m)

A = (0.25 x 10⁻⁶ F)(2 x 10⁻⁵ m)/(3)(8.85 x 10⁻¹² C/N.m²)

A = 0.188 m²

Answer:

2.66 m/s² .

Explanation:

Initial velocity , u = 0 m/s

Final Velocity , v = 8 m/s

Time Taken , t = 3 s

So , Acceleration = (v-u)/t = (8 m/s - 0 m/s) /3 sec . = 8/3 m/s² = 2.66 m/s²

Answer:

it's 24

Explanation:

I took the test and got 100 %

Answer:

24

Explanation:

Answer:

A. a rigorously tested explanation

Explanation:

Answer:

The answer is option letter B

Answer:

The reaction force is the force that causes the ball to move toward the bat.

Explanation:

Answer:

D; the reaction force is the force of the ball on the bat.

Explanation:

Answer:

Explanation:

The gravitational potential energy of a body can be found by using the formula

GPE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

GPE = 6 × 9.8 × 2

We have the final answer as

Hope this helps you

Answer:

b

Explanation:

Answer:

  ≈ 6.68 m/s

Explanation:

A suitable formula is ...

  vf^2 -vi^2 = 2ad

where vi and vf are the initial and final velocities, a is the acceleration, and d is the distance covered.

We note that if the initial launch direction is upward, the velocity of the ball when it comes back to its initial position is the same speed, but in the downward direction. Hence the problem is no different than if the ball were initially launched downward.

Then ...

  vf = √(2ad +vi^2) = √(2·9.8 m/s^2·1.0 m+(5 m/s)^2) = √44.6 m/s

  vf ≈ 6.68 m/s

The ball hits the ground with a speed of about 6.68 meters per second.

__

We assume the launch direction is either up or down.

Answer:

22.5 kg

Explanation:

solve for mass in the kinetic energy equation then round to a whole number

A beaver runs at a speed of 2.0 m/s with 45 J of kinetic energy.

What is the beaver’s mass?

Answer: 22.5 kg

Answer: Conductor, semiconductor, insulator

Explanation:

Just did the quiz

The correct option is option A.

The descending order in which electrons flow easily is:

Conductor, semiconductor, insulator

The correct order for materials by their ability to allow the flow of electrons, from most easily to least easily is Conductor, semiconductor, insulator.

Conductors are generally metals, they have plenty of free electrons due to which the electron flow is easy. Also, the conduction band and valance band in a conductor overlap, so they can conduct at room temperature.

In the case of semiconductors, the band gap between the conduction band and valance band is almost 1eV, so a little energy is enough to make the flow of electrons possible

Whereas, in insulators, the band gap is quite high and electrons can not jump from the conduction band to the valence band due to which the flow of electrons is not possible.

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Answer:A. The source is written by the person who conducted the experience

Explanation:

Primary source is the source that is written by the person who conducted the experiment. The correct option is A.

The easiest way to describe a primary source is that it was created by someone who actually participated in the experiment or event being researched.

A primary source offers information that has been obtained directly from the person who conducted the research or investigation.

It provides a clear viewpoint and insights into the topic, making it a useful and reliable source for research and analysis.

Research papers, diaries, interviews, original documents, experimental results, and eyewitness stories are a few examples of primary sources.

Thus, the correct option is A.

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Answer:

Matter is a substance which has mass and takes up space by volume the properties of matter are,

States of matter (solid,liquid,gas)are inter convertable.

Force of attraction varies from one kind of matter to another.

States of matter can be varied by varying temperature and pressure.

Explanation:

Answer:

Explanation:

From the question we are told that

   The mass of the tennis ball is  [tex]m = 0.060 \ kg[/tex]

    The speed is  [tex]u = 15 \ m/s[/tex]

    The initial height of the ball is  [tex]h_o = 2.2 \ m[/tex]

     The height considered is  [tex]h = 9.5 \ m[/tex]

Generally the time taken to reach the considered height is mathematically evaluated from the equation of motion as follows

           [tex]h = h_o + ut - \frac{1}{2} gt^2[/tex]

=>         [tex]9.5 = 2.2 + 15t - \frac{1}{2} * 9.8 t^2[/tex]

=>         [tex]7.3 = 15t - 4.9t^2[/tex]

=>          [tex]4.9t^2 -15t + 7.3[/tex]

solving the above equation using quadratic formula

           [tex]t= 0.6070 \ s[/tex] and  [tex]t_1 = 2.454 \ s[/tex]

Generally from kinematic equation we have that

        [tex]v = u - gt[/tex]

=>     [tex]v= 15 - 9.8 * 0.6070[/tex]

=>      [tex]v= 9.0514 \ m/s[/tex]

Note if we had used the second values of time the velocity at 9.5 \ m would have been negative which is not correct given that at maximum height velocity is zero

Answer:

it will be 318.5 Kelvin

Answer:

Explanation:

Let the direction of the south be -y

Let the direction of the east be +x

The displacement is gotten by using the pythagoras theorem as shown;

Let d be the displacement;

d² = x² + y²

Given

x = 45 yards

y = -80 yards

Substitute the given values into the expression;

d² = x² + y²

d² = 45² + (-80)²

d² = 2025 + 6400

d² = 8425

d = √8425

d = 91.79 yards

Hence the total displacement of the player is 91.79 yards

Answer:

12.5

Explanation:

500 divided by 40 = 12.5

Answer:

Geology Notes

1 Veryovkina Cave 2212[1] 13.5 km (8.4 mi)[1] Abkhazia / Georgia 43°23′52″N 40°21′37″E.

Answer:

Elevate the wound.

Hope this helped!

its b welcome

Explanation:

Answer:

[tex]\huge\boxed{\sf a_{c} = 15.6\ m/s^2}[/tex]

Explanation:

Given Data:

Radius = r = 40 m

Speed = v = 25 m/s

Required:

Centripetal Acceleration = [tex]\sf a_{c}[/tex] = ?

Formula:

[tex]\sf a_{c} = \frac{v^2 }{r}[/tex]

Solution:

[tex]\sf a_{c} = \frac{v^2}{r} \\\\a_{c} = \frac{(25)^2}{40} \\\\a_{c} = \frac{625}{40} \\\\a_{c} = 15.6 m/s^2\\\\\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

I think that's Newton's second law of motion

Explanation:

f = m(v-u)

________

t

since a = (v-u)t

f = ma