Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by
a. 0°C.
b. +5°C.
c. –5°C.
d. +10°C.
e. –10°C.
a
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A worker pushes a wheelbarrow with a horizontal force of 50.0 N over a level distance of 5.0 m. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
a. 250 J b. 0.0 J c. 35 J d. 10.0 J
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z is neutral (has no net charge.) e. Y is negatively charged or neutral (has no net charge.)
Ice melts at
A. 0 K B. 0 C C. 0 F D. 100 C
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