A pulley system can
A) change the direction of a force.
B) multiply a force.
C) both of these
D) none of the above
Answer: C
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How many kilocalories of heat would be needed to melt 0.12 kg of ice at 0°C and increase the temperature to 25°C?
The volume coefficient of thermal expansion for gasoline is 9.50 × 10-4 per degree C. By how much does the volume of 1 L of gasoline change when the temperature rises from 20.°C to 40.°C?
A) 37. cm3 B) 6.0 cm3 C) 19. cm3 D) 24. cm3 E) 12. cm3
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 2.0 
B. 1.8
C. 1.0
D. 0.9
E. 0.6
The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the gases plotted in the diagram could be retained in the atmosphere of Mars?