Lab Phy 108 Spring 2018 Midterm 11. Based on your knowledge of physics or just a

Question

Lab Phy 108 Spring 2018 Midterm 11. Based on your knowledge of physics or just a sense of the meaning of the word elastic, panel 3 of (a), it is a different snowball thrown by an unseen character)? which of the following collisions would you say is more elastic (note that in FUNNY THE SECOND TIME YOU HEAR IT ?! TOO LATE CPANT PANT) MADEM GUITTING IF ANOERNE DONIT stor OME RUN.USING THs TENNIS BAL Mn. 12. A car has a momentum of 10,000 kg'm/s and a kinetic energy of 50,000 J. If the kinetic energy is increased to 200,000 J (its mass doesn't change and it continues moving in the same direction), what is the momentum? (a) 160,000 kg'm/s (b) 80,000 kg'm/s (c) 40,000 kg'm/s (d) 20,000 kg'm/s (e) 2,500 kg m/s 13. Look back at the transverse wave shown in question 4. Imagine this is a standing wave that is fixed at the endpoints of the section shown. How many nodes are shown? (Hint: Remember that a standing wave that is fixed at both ends can have 2, 3, 4,... nodes, but not 1.) (a) 3 (b) 6 (c) 7 (d) 13

Explanation / Answer

12.

Momentum is given by:

P = m*V

Kinetic energy is given by

KE = m*V^2/2 = P^2/(2*m)

P = sqrt (2*m*KE)

So we can see that for same mass, momentum is directly proportional to square root of kinetic energy, which means

P2/P1 = sqrt (KE2/KE1)

P2 = P1*sqrt (KE2/KE1)

Using given values:

P2 = 10000*sqrt (200000/50000)

P2 = 20000 kg-m/sec

Correct option is D.

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