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garri49 [273]
3 years ago
7

Identical guns fire identical bullets horizontally at the same speed from the same height above level planes, one on the Earth a

nd one on the Moon. Which of the following three statements is/are true? I. The horizontal distance traveled by the bullet is greater for the Moon
Physics
1 answer:
olga nikolaevna [1]3 years ago
3 0

Answer:

horizontal distance on moon > horizontal distance on earth

Explanation:

Let the time of fall is t and the height from which they fall is h.

The time of fall is

t=\sqrt{\frac{2h}{g}}

Time of fall on earth

t=\sqrt{\frac{2h}{g_{e}}

Time of fall on moon

t'=\sqrt{\frac{2h}{g_{m}}

As the gravity on moon is less than the gravity on earth

So, t' > t

Horizontal distance = horizontal velocity x time

So, the horizontal distance on moon is more than the horizontal distance on earth.

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Answer:

-0.4 m/s

Explanation:

According to the law of conservation of momentum, the total momentum of the bullet - rifle system must be conserved.

The total momentum before the shot is zero, since they are both at  rest:

p_i = 0

While the total momentum after the shot can be written as:

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Since the total momentum is conserved, we can write:

p_i = p_f

So

0=mv+MV

And solving for V, we find the recoil velocity:

V=-\frac{mv}{M}=-\frac{(0.010)(200)}{5}=-0.4 m/s

and the negative sign indicates that the velocity is opposite to the bullet.

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