Convection occurs in the troposphere but not in the stratosphere because
A) the troposphere is warmer than the stratosphere.
B) the troposphere is cooler than the stratosphere.
C) lower altitudes of the troposphere are warmer than higher altitudes, unlike in the stratosphere.
D) higher altitudes of the troposphere are warmer than lower altitudes, unlike in the stratosphere.
E) the troposphere contains fewer greenhouse gases than the stratosphere.
C
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Star clusters are important to our study of the lives of high-mass versus low-mass stars because
a. stars in each cluster all formed at about the same time all with the same mass. b. the Sun was once a member of a globular cluster. c. stars in each cluster all formed at about the same time but with differing masses. d. stars in each cluster all formed at different times with differing masses. e. All of the other choices are correct.
Which of the following is an example of convection?
A) different kinds of material separating by density, like oil and water B) rocks sinking in water C) warm air expanding and rising while cooler air contracts and falls D) gas bubbling upward through a liquid
As I pull a rope connected to a box at constant speed up a frictionless slope, pulling parallel to the slope, the tension in the rope will be:
a. greater than the tension would be if the box were stationary. b. greater than the weight of the box. c. equal to the weight of the box. d. less than the weight of the box.
If the net force applied to an object is zero, the net torque:
a. must also be zero. b. can never be zero. c. can sometimes be zero. d. is not related to the net force. e. can only be clockwise.