A quantity that is a measure of how the distance traveled changes with time is
A. acceleration.
B. velocity.
C. force.
D. speed.
E. momentum.
Answer: D
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Because of Earth's rotation, a swinging pendulum rotates about a vertical axis once every twenty-four hours.
a. true b. false
The central core inside an atom is the
a. electron b. proton c. neutron d. nucleus e. none of the above
Of the thousands of different isotopes known to exist,
a. most of them are radioactive b. only a couple can be used to build an atom bomb c. some are used in medical diagnosis and treatment d. most occur naturally e. all of the above
A child, whose weight is 150 newtons, lifts a pumpkin from the ground with a force of 50 newtons. The force the pumpkin exerts on the child is
A. 50 newtons. B. zero. C. more than 50 newtons. D. greater than zero but less than 50 newtons.