If rockets are fired from an airplane in the backward direction, the momentum of the airplane will
a. increase
b. decrease
c. no change
d. increase then decrease
e. none of above
Ans: a. increase
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Which of the following technological advances was not useful in the 1930s to advance the study of nuclear reactions?
A suitcase is sitting on a horizontal conveyor belt, which is moving at speed v. The work done by the frictional force on the suitcase is a. positive
b. negative. c. zero. d. impossible to determine without knowing the mass of the suitcase.
A 30.0 cm wrench is used to generate a torque at a bolt. A force of 40 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 5.0 N•m. B. 7.0 N•m. C. 9.0 N•m. D. 12 N•m. E. 20 N•m.
The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
a. True b. False Indicate whether the statement is true or false