A bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling. Assuming there is no friction and the bottom of the hill is 20 meters below the top, what is the bicyclist's speed at the bottom of the hill?
19.8 m/s
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Thermodynamic Devices: An ideal Carnot refrigerator powered from an electrical outlet takes heat from water at 0.0°C and rejects heat to a room at 20.0°C. How much electrical energy must be supplied to the refrigerator so it will convert 78 g of water at 0.0°C to ice at 0.0°C. The latent heat of fusion of water is 3.34 × 105 J/kg.
Fill in the blank(s) with the appropriate word(s).
A thin metal sheet in the xy plane carries current in the ?y direction. What is the direction of the magnetic field everywhere in the region above the sheet? 
in this case
A. points in the +x direction. B. points in the ?x direction. C. points in the +y direction. D. points in the ?y direction. E. points in the +z direction. F. points in the ?z direction. T. is zero.
A football player leaps at 3.0 m/s toward a second football player, who is at the time of the collision moving at 0.5 m/s toward the first player. After the collision, the two players move together at 1.2 m/s. If the originally stationary player's mass is 175 kg, what is the other's mass?
A. 185 kg B. 119 kg C. 165 kg D. 68 kg
An infrared thermometer operates by way of
A) temperature differences. B) radiant energy invisible to humans. C) conduction, convection, and radiation. D) none of the above