A 40.0-kg crate is being raised by means of a rope. Its upward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
A) 80.0 N
B) 312 N
C) 392 N
D) 472 N
E) 552 N
D
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Which hypothesis suggested that the Moon formed elsewhere and was later caught by Earth's gravity?
a. fission hypothesis b. fusion hypothesis c. large-impact hypothesis d. capture hypothesis e. condensation hypothesis
A galaxy's spectrum has a redshift of 30,000 kilometers per second. If the Hubble constant is 75 kilometers per second per megaparsec, how far away from Earth is the galaxy?
A. 1,000 megaparsecs B. 106 megaparsecs C. 400 megaparsecs D. 20 megaparsecs E. 50 megaparsecs
If the pole-vaulter were to land on concrete rather than on a cushion, the impulse that stops the fall would be:
a. greater because of the rigidity of the concrete. b. greater because the force of impact is greater. c. less, because there is less change in momentum during the stop. d. less, because he would come to a stop over a shorter period of time. e. the same because impulse is the change in momentum of the object.
A laser emits monochromatic and coherent light
Indicate whether the statement is true or false