In the development of a terrestrial planet, the stage of ____ when dense material settled to the core and less dense to the outer parts
a. differentiation
b. cratering
c. glaciation
d. accretion
e. flooding
A
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Superconductivity is lost when a certain critical temperature is exceeded
a. True b. False Indicate whether the statement is true or false
According to the second law of thermodynamics, which of the following applies to the heat received from a high temperature reservoir by a heat engine operating in a complete cycle?
a. must be completely converted to work b. equals the entropy increase c. converted completely into internal energy d. cannot be completely converted to work
A large spring requires a force of 100 N to compress it only 0.010 m. What is the spring constant of the spring?
a. 1.0 N/m c. 10,000 N/m b. 100 N/m d. 100,000 N/m
A ball thrown upwards reaches a maximum height and then comes back down to the original level. When a body moves in circular motion at constant speed
a. the velocity and acceleration point in the same direction b. the velocity and acceleration point in opposite directions c. the velocity and acceleration point perpendicular to each other d. the acceleration is zero e. none of the above