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2 years ago

14

a car company claims that its car can accelerate from rest to a speed of 28.0 m/s in 20.0 s. find the average acceleration of th

e car

1 answer:

elixir [45]2 years ago

5 0

tje average acceleration of the car is

$\frac{28}{20} = 1.4$

the average acceleration of the car is 1.4 m/s

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Johanna is studying what happens to the energy as a ball rolls down a ramp. What is one form of energy that she is studying? gra

timofeeve [1]

Answer: gravitational potential energy

Explanation:

Gravitational potential energy is refered to as the potential energy that an object has due to its gravitational field, which in turn is being turned into a kinetic energy when there is a fall of such objects.

Since Johanna is studying what happens to the energy as a ball rolls down a ramp, the form of energy here is the gravitational potential energy.

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2 years ago

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A wooden rod of negligible mass and length 80.0cm is pivoted about a horizontal axis through its center. A white rat with mass 0

algol13

Answer:

The speed of the animals is 1.64m/s.

Explanation:

Let us work with variables and call the mass of the two rats $m_1$ and $m_2$ , and the length of the rod $L$ .

Using the law of conservation of energy, which says the potential energies of the rats must equal their kinetic energies, we know that when the rod swings to the vertical position,

$m_1\frac{L}{2}g -m_2\frac{L}{2}g = \frac{1}{2}m_1v^2+\frac{1}{2}m_2v^2$

$(m_1 -m_2)g\frac{L}{2} = \frac{1}{2}(m_1+m_2)v^2$ ,

solving for $v$ , we get:

$\boxed{v = \sqrt{\frac{(m_1 -m_2)gL}{(m_1+m_2)}} }$

Putting in the values for $m_1$ , $m_2$ , $g$ , and $L$ we get:

$v = \sqrt{\frac{(0.450kg -0.220kg)(9.8m/s^2)(0.8m)}{(0.450kg+0.220kg)}}$

$\boxed{ v= 1.64m/s}$

Therefore, as the rod swings through the vertical position , the speed of the rats is 1.64 m/s.

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2 years ago

A jet can travel at 400 minutes per second how far will it travel at this speed in 3 seconds

MaRussiya [10]

400 * 3 = 1200
A jet can travel 1200 minutes for 3 seconds

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Detlev walks 1000 meters north to the store and walks back 900 meters south to his friends house. The friends house is 100 meter

lilavasa [31]

1000 is the correct answer

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2 years ago

1. What causes velocity to change?

tresset_1 [31]

The amount of force an object has will change the velocity

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