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pentagon [3]
3 years ago
5

A boy pulls a wagon full of newspapers down the sidewalk at a constant acceleration. Suddenly, half the newspapers fall off the

wagon. If the boy continues to pull with the same force as before, what happens?
A.The net force remains constant.

B.The wagon suddenly speeds up.

C.The mass that he is pulling does not change.
Physics
1 answer:
vitfil [10]3 years ago
5 0
The answer is B

rtheojdjsfioaj



      
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A 50 kg pitcher throws a baseball with a mass of 0.15 kg. If the ball is thrown with a positive velocity of 35 m/s and there is
Andreas93 [3]

The velocity of the pitcher is <u>0.105 m/s</u> in a direction opposite to the velocity of the ball.

When no external force acts on a system, the total momentum of the system is conserved. The total initial momentum of the system is equal to the total final momentum of the system.

The pitcher and the ball are initially at rest, therefore, the total initial momentum of the system is zero.

Since no external forces act on the system comprising of pitcher and the ball, the total final momentum of the system is also equal to zero.

If the mass of the pitcher is mp and its speed is vp, the mass of the ball is mb and the ball's speed is vb, then the final momentum of the system of pitcher and the ball is given by,

p=m_pv_p+m_bv_b=0

Therefore,

v_p=-\frac{m_b}{m_p} v_p

Substituet 0.15 kg for mb, 50 kg for mp and 35 m/s for vb.

v_p=-\frac{m_b}{m_p} v_p=-\frac{0.15 kg}{50 kg} (35m/s)=-0.105 m/s

The pitcher has a velocity <u> 0.105 m/s</u> opposite to the direction of the velocity of the ball.

8 0
3 years ago
What’s the answer?hhhu
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Which one if you want independent variable meaning that means  variable (often denoted by x ) whose variation does not depend on that of another.

7 0
3 years ago
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Art [367]

Answer:

800pa

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According to your fitness guide, 10,00 steps equals how many miles approximately? Question 5 options:
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