Problem 1: A car of 1500 kg. of mass hits a wall, as seen in Figure 9.6a. The initial speed Vi = - 15i m/sec. The final speed VF = - 15i m/sec. If the shock lasts 0.15 sec. Find the impulse due to this and the average force exerted on the car?
Problem 2: An 1800 kg car. Stopped at a traffic light, he is hit from behind by a 900-kg car. And the two are hooked. If the smaller car was moving at 20 m/s before the collision. What is the speed of the hooked mass after this?
Problem 3: A boy bounces a large ball on a sidewalk. The linear impulse delivered by the sidewalk to the ball is 2 N-sec. for 1/800 sec. contact. What is the magnitude of the average force exerted by the sidewalk on the ball?
(I = Impulse = F t )
Problem 4: A pitcher claims that he can throw a baseball with as much momentum as a 3-g bullet. Moving with a speed of 1500 m/sec. A baseball has a mass of 0.145 kg. What must his speed be, if the pitcher's call is valid? (Momentum of the baseball = momentum of the bullet)
Problem 5: A car stops at a traffic light. When the light turns green, the car accelerates, increasing its speed from zero to 5.2 m/sec. in 0.832 sec. What linear impulse and average force does a 70 kg passenger experience? in the car? Impulse (I) = m * (VF - Vo) and I = Impulse = F t
Problem 6: A 0.15-kg baseball is thrown with a speed of 40 m/sec. It is then hit directly towards the pitcher with a speed of 50 m/sec.
a) What is the impulse received by the ball? (ΔP = mVF - mVo)
b) Find the average force exerted by the bat on the ball if the two are in contact for 2 * 10-3 sec. ( I = Impulse = F t )