Most of Earth's fresh water is in
a. the atmosphere.
b. lakes and rivers.
c. glacial ice sheets.
d. aquifers.
c
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What is the direction of 
at point Q?
A. A B. B C. C D. D E. E F. F T. Zero
A person is walking outdoors on a cold day when the temperature is -20°C. He is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales 0.0050 m3 of air
At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/kg ? K and the density of air is 1.29 kg/m3. A) 90 W B) 150 W C) 60 W D) 100 W E) 300 W
A 2.0-m long piano string of mass 40 g is under a tension of 338 N. Find the speed with which a wave travels on this string
a. 130 m/s c. 520 m/s b. 260 m/s d. 1040 m/s
Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg mass in the center
A force of 50 N pushes on the 5.0-kg mass, which pushes against the other two masses. (a) Draw the free-body diagrams for each of the masses. (b) What is the contact force between the 5.0-kg mass and the 3.0-kg mass? (c) What is the contact force between the 3.0-kg and the 2.0-kg mass?