A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving at 12 m/s. They stick together and move at a speed of
A) 3 m/s.
B) 4 m/s.
C) 6 m/s.
D) 8 m/s.
E) none of the above
Answer: E
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Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude of 6.0 nC, are released simultaneously from rest when they are a very large distance apart. What distance separates the two at the instant when each has a speed of 5.0 m/s?
A. 4.3 mm B. 8.6 mm C. 7.3 mm D. 5.6 mm E. 2.2 mm
A person has a mass of 45 kg. How much does she weigh on the Moon, where g = 1.62 m/s2?
A) 45 N B) 73 N C) 7.4 N D) 220 N E) 440 N
If two protons are moved 3 times farther apart, the electrical force between them is what factor of the original force?
A proton's rest mass is 1.67 × 10^-27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^-10 J b. 1.5 × 10^-10 J c. -2.0 × 10^-10 J d. 2.5 × 10^-10 J e. 7.5 × 10^-10 J