A 120-g rubber ball is thrown with a speed of 10 m/s at an oncoming 900-kg car which is approaching at 30 m/s, and undergoes a one-dimensional elastic collision with the car. What is the speed of the ball after the collision?
A) 10 m/s
B) 30 m/s
C) 40 m/s
D) 50 m/s
E) 70 m/s
E
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Total internal reflection
A. Can occur when light travels from lower index of refraction into higher index of refraction. B. Can occur when light travels from higher index of refraction into lower index of refraction. C. Can occur in any combination of indices of refraction. D. Never occurs.
The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is:
A. 200 K B. 300 K C. 400 K D. 450 K E. 600 K
Square coil A has 2N turns and sides of length L, and square coil B has N turns and sides of length 2L. When a current of 2 amps is sent through coil A and a current of 1 amp is sent through coil B, which coil has the greater magnetic moment?
a. coil A b. coil B c. Both have the same magnetic moment. d. More information is needed.
Air expands adiabatically (no heat in, no heat out) from T = 300 K and P = 100 atm to a final pressure of 1 atm. Treat the gas as ideal with ? = 1.4, and determine the final temperature. Compare your result to the boiling points of nitrogen (77.4 K) and oxygen (90.2 K). Could this method result in the liquification of air?