A handball of mass 0.10 kg, traveling horizontally at 25. m/s, strikes a wall and rebounds at 19. m/s. What is the change in the momentum of the ball?
A) 4.4 N-s
B) 72 N-s
C) 1.2 N-s
D) 1.8 N-s
E) 5.4 N-s
A
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Einstein's theory of relativity is based in part on which one of the following postulates?
a. Mass and energy are equivalent. b. Space and time are absolutes. c. Energy is conserved only in elastic collisions. d. Speed of light in a vacuum is same for all observers regardless of source velocity.
It used to be thought that both of Mars' moons were captured asteroids. Information from Mars Express and Mars Global Surveyor has led to the conclusion that Phobos may have formed by a different process. Briefly describe that process
What will be an ideal response?
An electron and a proton
A) attract each other. B) repel each other. C) attract or repel depending on distance.
A piston in an internal combustion engine applies torque during 
of each full rotation of the crankshaft to which it is connected. Suppose an 8-cylinder engine (8 such pistons) is running with its crankshaft turning at 2500rpm and produces 410J of work each second. What is the torque applied to the crank shaft by one of the engine’s eight pistons?
A. 3.8 Nm B. 1.6 Nm C. 0.47Nm D. 0.20 Nm