What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N
b. 200 N
c. 98 N
d. 49 N
e. Some value other than those given above.
E
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Two crates of mass 65 kg and 125 kg are in contact and at rest on a horizontal surface (figure below). A force of 650 N is exerted on the 65 kg crate. If the coefficient of kinetic friction is 0.18, calculate:
a) the acceleration of the system and
b) the force that each crate exerts on the other. Draw a FBD (full body diagram). Show all work.
Which of the following statements about brown dwarfs is not true?
A) Brown dwarfs eventually collapse to become white dwarfs. B) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature. C) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores. D) All brown dwarfs have masses less than about 8% that of our Sun.
All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet. B) Venus has many circular features, called coronae, which appear to be tectonic in origin. C) Venus's largest features are three elevated regions that look somewhat like continents. D) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle.
Venus has a high reflectivity because of its
A) light-colored rocks. B) snow. C) clouds. D) dust storms. E) volcanic ash.