Dana uses a rope to pull a box that weighs 300 N across a level surface with constant velocity. The rope makes an angle of 30° above the horizontal and the tension in the rope is 50 N. What is the coefficient of friction?
a. 0.35
c. 0.16
b. 0.29
d. 0.20
C
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A. 2500 ? B. 796 ? C. 15.7 ? D. 2.50 ?
Calorimetry: A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C. A 24.0-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no heat exchange with the surroundings. For water, the specific heat capacity is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat capacity of the metal of the container?
A. 1700 J/kg ? K B. 970 J/kg ? K C. 2300 J/kg ? K D. 2800 J/kg ? K E. 3300 J/kg ? K
If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror:
a. is equal to the height of the man. b. is equal to one half the height of the man. c. depends on the distance the man stands from the mirror. d. depends on both the height of the man and the distance from the man to the mirror.
The Hubble Space Telescope is the largest telescope ever built.
Answer the following statement true (T) or false (F)