The question is in the photo.

Answer:8.2N

Explanation:I did the quiz on k12 and that’s the answer i got :)

Height,h= 20m

"gently dropped" means initial velocity, u, =0m/s

Uniform acceleration, g=10m/s²

using the formula v²=u²+2gs

Substituting, v²=0²+2*10*20

v²=400

v=

[tex] \sqrt{400} [/tex]

v=20m/s

Time, t at which is strike the ground

using the formula v=u+at

Substituting, 20=0+10t

20=10t

t=2s

This means that the bank strike the ground with a velocity of 20m/s in 2s.

Answer:

eeeeeeeeeeeeeeeeeeeeeeeeeeeee

Explanation:

Answer:

3a^5 - (-a^5) = 3a^5 + a^5 = 4a^5

6a^7 - 2a^7 = 4a^7

-3a^5 - (-2a^5) = -3a^5 + 2a^5 = -a^5

7a^7 - 8a^7 = -a^7

Answer:

here ya go

Explanation:

Answer:

126.32m/s

Explanation:

The formula for calculating the speed of wave is expressed as:

Speed of wave = frequency/wavelength

Given

Wavelength = 4.75m

Frequency = 600Hz

Required

Speed of the wave

Substitute the given value into the formula

Speed = 600/4.75

Speed = 126.32m/s

Hence the speed of the wave is 126.32m/s

Answer:

To solve this problem we will apply the principle of conservation of energy for which we have that the potential energy on a body, is equivalent to the work done on it at the given point. Therefore we will have the following equality

At the same time we know that work is equivalent to the Force applied over a given distance, so,

The potential energy is equivalent to the product between mass, gravity and height. Recall that the product of mass and gravity is equivalent to weight (The same given in the statement)

Equating,

Then,

Replacing,

Therefore the force needed to lift the piano is 600N

Explanation:

HOPE THIS HELPS!!!

Answer:

10 Pascal

Explanation:

[tex]pressure =\frac{force}{area}[/tex]

[tex]pressure= \frac{200}{20}[/tex]

pressure = 10 Pa

Answer:

He needs to enroll himself in CMMA. This company help young students obtain a well future in Construction Science.

Answer:

The new force of attraction between the two objects will be remain the same.

The gravitational law states that the gravitation force is the ratio of the product of the masses and the square of the distance between them.

Let the masses be m and M and the distance between them is r. Then the force is given as,

F = GmM / r²

Suppose that two objects attract each other with a gravitational force of 16 units.

F = 16

GmM / r² = 16 units

If the mass of both objects was doubled, and if the distance between the objects was doubled. Then we have

F' = G(2m)*(2M) / (2r)²

F' = 4GmM / 4r²

F' = GmM / r²

F' = 16 units

The new force of attraction between the two objects will be remain the same.

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Answer:

the answer is true Induction charging is a method used to charge an object without actually touching the object to any other charged object.

Explanation:

Answer:

[tex]V_a =1.4285m/s[/tex]

Explanation:

From the question we are told that

70 kg astronaut

5 kg ball

A velocity of 20 m/s east

Generally with Law of conservation of momentum in place for a body in space

initial and final momentum must be equal

Therefore

[tex]M_b*V_b=M_a*V_a[/tex]

[tex]M_b=Mass of ball \\V_b=Ball velocity \\M_a= Mass of astronaut \\V_a= Astronaut velocity[/tex]

Mathematically solving for[tex]V_a[/tex]

[tex]V_a =\frac{5*20}{70}[/tex]

[tex]V_a =1.4285m/s[/tex]

Therefore the Astronauts velocity relative to his mass is given to be

[tex]V_a =1.4285m/s[/tex]

The velocity of the astronaut is 1.43 m/s.

From Newton's third law of motion,

To get the velocity of the astronaut, we use the formula below.

Formula:

Where:

make V the subject of the equation

From the question,

Given:

Substitute these values into equation 2.

Hence, the velocity of the astronaut is 1.43 m/s.

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Answer:

Gravitational potential energy is greatest at the highest point of a roller coaster and least at the lowest point.

Answer:

aww that's simple! its B can i get brainliest? i really need some points rn <3

Explanation:

Answer:

B

Explanation:

Answer:

contact

Explanation:

A contact force is defined as a force which requires some contact to occur. When we apply force that is in contact with the objects are called as contact forces.

In the context, Carmen is loading furniture and boxes on a moving van by picking up by picking up the boxes or furniture on a cart and pushing it onto the van. Carmen uses contact forces to lift the boxes and furniture onto the van.

Answer:

13950kg

Explanation:

If we make the system both railroad cars, we know that the momentum of the whole system doesn't change because the forces are internal.

Let a be the mass of the second car.

The original momentum is 9300*15 kg*m/s+ a*0 kg*m/s = 139500 kg*m/s

After sticking together, the momentum is (9300+a)kg*6m/s, which should be equal to 139500 kg*m/s

Therefore (9300+a)*6 = 139500

9300+a = 23250

a = 13950 kg

Answer:

Friction is a resistive force to motion. When two bodies move against each other some of the kinetic energy is converted to heat energy due to friction. This reduces the total kinetic energy in the system.

Explanation:

Answer:

i disagree because if you throw a ball in the air gravity will bring it down so only the force that moved it was needed.

Explanation:

Answer:

5.1 x 10¹⁰s

Explanation:

Given parameters:

Decay constant  = 13.6 x 10⁻¹²/s

Unknown:

Half life of the element  = ?

Solution:

From the decay constant, we can find the half-life of this radioactive element.

  Half-life  = [tex]\frac{0.693}{decay constant}[/tex]  

     Half-life  = [tex]\frac{0.693}{13.6 x 10^{-12} }[/tex]   = 5.1 x 10¹⁰s

Answer:

The tension in the rope is 10 N

Explanation:

The Force Vector

Like all vectors, the force has a magnitude and direction. Vectors can be decomposed into two perpendicular components on both axes.

The tension in the rope (F) can be calculated by using vector decomposition as follows.

The figure included below shows a force F which horizontal component is known to have a value of Fx= 5 Nw. The angle formed by the force and its horizontal component is 60°.

We can use the trigonometric ratio called the cosine to find the magnitude of F as follows:

[tex]\displaystyle \cos 60^\circ = \frac{5}{F}[/tex]

Solving for F:

[tex]\displaystyle F = \frac{5}{\cos 60^\circ}[/tex]

[tex]\displaystyle F = \frac{5}{\frac{1}{2}}[/tex]

Thus, F = 10 N

The tension in the rope is 10 N

Answer:

B. Increases

Explanation:

Momentum is given as [tex]p=mv[/tex]. Since [tex]m[/tex] is maintained, as the velocity decreases, the momentum decreases, and similarly, as the velocity increases, the momentum increases.

speed speed scalar quantity is the rate of at which an object covers distance on the other hand velocity is a vector quantity it is direction aware.velocity is the rate at which the position changes.the average velocity is the displacement or position change Per time ratio.so velocity is a vector quantity but speed is a scalar quantity

Answer: The tile floor.

Explanation:

We can think of this as follows:

By the second Newton's law, we know that:

F = m*a

force is equal to mass times acceleration.

Now, as the egg hits the ground, we can think that there is a force that is applied in a very short period of time.

(similar to the case of a bat hitting a baseball)

Ok, the total energy of the impact will be the same for any surface in which the egg falls.

But suppose that the egg falls in a carpet, in this case, the carpet has a kinda large collision time (the time that the force is applied to the egg), this means that we will have a smaller force, acting for a long period of time. Now if the egg falls on something harder, like the tile floor, the collision time will be a lot shorter, then the force must be a lot stronger to compensate, this force is so large, that breaks the shell of the egg.

the tile floor is then the correct answer.

Answer:

The value of acceleration due to gravity is greater in terai than in mountain. In terai region the radius of earth is less as it lies close to the centre of the earth. Thus, the value of g is more in terai region.

Answer:

[tex]\boxed {\boxed {\sf 95,795 \ Joules}}[/tex]

Explanation:

Gravitational potential energy is found using the following formula.

[tex]E_p=m*g*h[/tex]

where m is the mass, g is the gravitational acceleration, and h is the height.

1. Define Variables

We know the anvil's mass is 115 kilograms and it's 85.0 meters above the coyote. Assuming this is on Earth, the acceleration due to gravity is 9.8 m/s²

[tex]m=115 \ kg \\h= 85.0 \ m \\g= 9.8 \ m.s^2[/tex]

2. Calculate Potential Energy

Substitute the values into the formula.

[tex]E_p=(115 \ kg)*(9.8 \ m/s^2)*(85.0 \ m)[/tex]

Multiply the first two numbers together.

[tex]E_p=1127 \ kg*m/s^2*(85.0 \ m)[/tex]

Multiply again.

[tex]E_p=95795 \ kg*m^2/s^2[/tex]

[tex]E_p=95795 \ J[/tex]

The anvil has 95,795 Joules of gravitational potential energy.

Answer:

Explanation:

Answer:

large

Explanation:

the harder you pluck the louder it gets

If you pluck the guitar string hard, the sound waves it gives off will have larger amplitudes

We know that, for soundwaves, the amplitude is related to the intensity of the sound.

If you pluck the guitar string hard, you will notice that the intensity of the sound increases. So we can conclude that the amplitude of the soundwaves will be larger than if you plucked the guitar string softer.

Then the complete statement would be:

"The sound waves it gives off will have larger amplitudes."

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