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4 years ago

Asap please,

1 answer:

3 0

The gun and the bullet have much different masses. The forces of each are equal but since f=mass * acceleration, the bullet will have a greater acceleration because its mass is much smaller.

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8. In the billiard ball room at the basement of Memorial Union, two identical balls are traveling toward each other along a stra

mel-nik [20]

Answer:

- Ball 1 will move backward at 7.89 m/s

- Ball 2 will move forward at 4.67 m/s

Explanation:

In an elastic collision, both the total momentum and the total kinetic energy of the system are conserved.

The conservation of the momentum can be written as:

$m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2$

where

$m_1$ is the mass of ball 1

$m_2$ is the mass of ball 2

$u_1$ is the initial velocity of ball 1

$u_2$ is the initial velocity of ball 2

$v_1$ is the final velocity of ball 1

$v_2$ is the final velocity of ball 2

The conservation of kinetic energy can be written as

$\frac{1}{2}m_1 u_2^2 + \frac{1}{2}m_2 u_2^2 = \frac{1}{2}m_1 v_1^2 + \frac{1}{2}m_2 v_2^2$

Working together the two equations, it is possible to find two expressions for the final velocities in terms of the initial velocities:

$v_1=\frac{m_1 -m_2}{m_1 +m_2}u_1+\frac{2m_2}{m_1+m_2}u_2\\v_2=\frac{2m_1}{m_1+m_2}u_1 -\frac{m_1 -m_2}{m_1 +m_2}u_2$

In this problem we have:

$m_1 = m_2 = m$ since the mass of the two balls is identical

$u_1=+4.67 m/s$ is the initial velocity of ball 1

$u_2=-7.89 m/s$ is the initial velocity of ball 2

Substituting into the equations, we find the final velocities:

$v_1=\frac{2m}{m+m}u_2=u_2 =-7.89 m/s\\v_2=\frac{2m}{m+m}u_1=u_1=+4.67 m/s$

Therefore:

- Ball 1 will move backward at 7.89 m/s

- Ball 2 will move forward at 4.67 m/s

7 0

3 years ago

An object moving at a constant speed in a circle is _____.

nordsb [41]

Answer:

A. accelerating

Explanation:

Acceleration is defined as the ratio between the change in velocity and the time taken for the velocity to change:

$a=\frac{\Delta v}{\Delta t}$

We must note that the velocity is a vector - so it has both a magnitude (the speed) and a direction.

This means that a non-zero acceleration occurs when:

- the speed changes, or

- the direction changes, or

- both the speed and the direction change

For an object moving at constant speed in a circle, the direction changes, so the object is accelerating.

5 0

3 years ago

why did Iran experience almost 80 times more deaths in the 20th Century than California, despite having the same seismicity?

Shkiper50 [21]

Answer: poor construction of houses

Explanation:

Majority of the people that died in Iran were as a result of poor building methods coupled with the fact that there was lack of proper regulation.

California experienced a similar earthquake but due to safer construction methods, about three people died.

Due to population boom in Iran and house shortage, this resulted in builders building cheap houses which were not strong enough.

6 0

3 years ago

Question 2 of 30 The government needs to provide public goods for what reason? A. They are necessary for raising the standard of

allochka39001 [22]

Answer:

Either C or D.

Explanation:

Either one of them.

3 0

3 years ago

The measure of energy that a wave carries is known as what

Annette [7]

Amplitude...........

4 0

3 years ago

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