Question

Q1 A small object with a momentum of magnitude 2.71 kg m/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 6.19 kg m/s. What is the magnitude of the small object's momentum change in kg m/s?

Q2 A force acts on a 4.708 kg mass as follows: the force starts at zero and rises to 60.334 N linearly in 2.24 seconds, it remains at 60.334 N for another 5.756 seconds, then diminishes linearly to zero in 1.212 second. If the mass had an initial velocity of 0 m/s, what is the final speed of the mass after the impulse?

Q3 A 13,299.096kg open rail car rolls under a hopper at 4.926m/s. The hopper dispenses grain into the moving rail car and the car slows down to 0.621m/s. How much grain was loaded into the car?

Q4 Two metal balls are hung from strings. The first ball, 0.13 kg, is pulled to the side and released so that it strikes the second ball with a speed of 1.66 m/s. The two balls stick together and the combined mass has a speed of 0.26 m/s after collision. What is the mass of the second ball?

Q5 Two balls with masses of 3.5 kg and 8.96 kg travel toward each other at speeds of 1.82 m/s and 8.64 m/s, respectively. If the balls have a head-on inelastic collision, how much kinetic energy is lost in the collision?

Q6 A 15 gram bullet is fired horizontally into a 0.853 kg wooden block suspended from the ceiling. The bullet is embedded in the block. The block, with bullet inside, swings upward and rises a vertical distance of 0.38 m. What is the initial speed of the bullet before striking the block?

Q7 Regulation tennis balls have a mass of 57.5 g. When dropped from a height of 3.02 m they must rebound to a height of 2.11 m to be acceptable for play. What is the loss in kinetic energy when these balls rebound?

Q8 - 80 Two car approach an intersection at a right angle to each other. If an inelastic collision occurs at the intersection, determine the x component of the final momentum of the combined vehicles. Car 1 of mass 904.54 kg approaches the intersection from the left with a speed of 29.98 m/s. Car 2 of mass 1,864.95 kg approaches the intersection from the south with a speed of 13.38 m/s.

Q9 A 68.72-kg pitching machine (excluding the baseball) is placed on a frozen pond. The machine fires a 0.05-kg baseball with a speed of 32.99 m/s in the horizontal friction. What is the recoil speed in m/s of the pitching machine? (Assume negligible friction.)

Q10 Two ice skaters face each other, one is 84.18 kg and the other is 48.07 kg. They push against each other’s palms and move apart. What is the speed of the lighter skater in relation to the heavier person?

Answer 1

As by Chegg's guidelines the first question is answered Solution Q1 The magnitude of momentum change of the small object is, J =Apl -p-P =6.19kg m/s-2.71kg m/s] 3.48kg m/s

Answer 2

SOLUTION :

Q1 :

Change in momentum of small object 

= Momentum after strike - Momentum before strike

= (- 6.19 ) - (-2.71)

= - 8.90 kg m/s  (negative sign means in the opposite direction to the initial direction)

So, magnitude of change of momentum = 8.90 kg m/s (ANSWER).