As hot mantle rock rises, it expands. As it expands it cools. This cooler rock is
A) less dense so it keeps rising to form underwater volcanoes.
B) more dense so it sinks. This contributes to the heat flow convection process.
C) ocean crust.
D) unstable and explodes in a volcano.
Answer: B
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According to general relativity, what is a black hole?
A) an object that cannot be seen B) a place where light travels slower than the normal speed of light C) a place where the strength of gravity is infinite D) a hole in the observable universe
A bowling ball of mass 7.5 kg and radius 9.0 cm rolls without slipping 10 m down a lane at 4.3 m/s
(a) Calculate the angular displacement of the bowling ball. (b) Calculate the angular velocity of the bowling ball. (c) Calculate the centripetal acceleration of the bowling ball. (d) Calculate the tangential acceleration of the bowling ball.
The celestial equator is
a. a line around the sky directly above Earth's equator. b. the dividing line between the north and south celestial hemispheres. c. the path that the sun appears to follow on the celestial sphere as Earth orbits the sun. d. a and b. e. a and c.
New rocks that have had their original form altered by heat and pressure, but without melting, are classified as
a. sedimentary. b. metamorphic. c. igneous. d. all of these.