A heat pump uses 100 J of work to output 150 J of heat at some temperature. What is the coefficient of performance for the heat pump?
A. 1.0
B. 1.5
C. 2.0
D. 2.5
E. 3.0
B. 1.5
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
In the above cartoon image of Orion, where would you find the Orion nebula?
a. below the belt (i.e., three white stars) but above the lower right blue and lower left white stars
b. above the belt (i.e., three white stars) but below the upper red and the upper white stars
c. in the belt, that is, among the three white stars
d. outside the white lines
Rotational Kinetic Energy: A solid uniform sphere of mass 120 kg and radius 1.7 m starts from rest and rolls without slipping down an inclined plane of vertical height 5.3 m. What is the angular speed of the sphere at the bottom of the inclined plane?
A. 5.1 rad/s B. 8.7 rad/s C. 9.7 rad/s D. 6.1 rad/s
What is the occupancy probability at an energy 1.0% above a Fermi level of 7.0 eV at 300 K?
A) 0.06% B) 1.0% C) 3.2% D) 6.3% E) 12%