A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick. Thermal conductivity for the glass is 0.63 W/mK. If 1.6 kJ is lost through the window in 12 s, and if inside the house the temperature is 
what is the outside temperature?
a. 
b. 
c. 
d. 
e. 
d.
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Compared to its rotational axis, Jupiter's magnetic field:
A) is exactly in alignment. B) lies about 10 degrees off, much like our own rotation and magnetic field. C) is tilted about 23.5 degrees, much like our own axial tilt. D) is tilted 98 degrees, much like the case of Uranus. E) has yet to be detected.
A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16-cm-high steps a 70-kg athlete could ascend in one minute while expending one horsepower is
A. 4. B. 7. C. 65. D. 408. E. 4567.
Suppose that a source of sound is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A) unchanged. B) half as great. C) as great. D) twice as great. E) one-fourth as great.
Jason takes off across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). Water exerts a force of 200 N on the skis
The coefficient of kinetic friction between skis and water is 0.10. Unfortunately, the skis run out of fuel after only 90 s. What is Jason's top speed? A) 150 m/s B) 240 m/s C) 24 m/s D) 90 m/s