Mechanics | Relativity Answers

Hobbes, the stuffed tiger, has a mass of 28.4 kg. Calvin, the little boy, has a mass of 17.7 kg. In a game of football, Hobbes runs to the right (towards Calvin) at 9.2 m/s. Calvin runs to the left (towards Hobbes) at 12.0 m/s. The two collide and stick together.



What is their final velocity? (Assume that velocities to the right are positive.)

Question text
A cannonball with a mass of 12.2 kg is fired from a cannon that has a mass of 511.1 kg. The cannonball is fired with a speed of 173.9 m/s, and it takes 0.009 seconds for the cannonball to leave the cannon.



Calculate the net force acting on the cannon.

A 8.21 kg bowling ball traveling at 14.66 m/s strikes a 2.1 kg bowling pin. The impact slows the bowling ball to 9.97 m/s.



Determine the change in momentum of the pin.

A baseball of mass 0.239 kg sits on a tee. A kid's bat hits the ball and maintains contact for 0.005 seconds. The result is that the ball leaves the tee with a velocity of 11.03 m/s, traveling exactly horizontally.



Find the impulse given to the ball.

particles p and Q leave a fixed point A at the same time and travel in the same straight line. the velocity of P after t seconds is 6t(t-3)ms-1 and the velocity of Q after t seconds is (10-2t)ms-1.
1) sketch,on the same axes, velocity-time graph for P and Q for 0<=t<=5
2)verify that P and Q meet after 5 seconds.
3)find the greatest distance between P and Q for 0<=t<=5

[img]https://upload.cc/i1/2020/04/13/StisGB.jpg[/img]

question is in picture,d8=4

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question is in picture

d8=4

[img]https://upload.cc/i1/2020/04/13/32I8fV.jpg[/img]



question in photo,d8 is 4

[img]https://upload.cc/i1/2020/04/13/d9J0an.jpg[/img]

Explain how it is possible for a small child and a large football player to have the same momentum. If the small child and the large football player were running side-by-side (same velocity) which would take more force to stop? Why?