A solar heating system has a 25.0% conversion efficiency; the solar radiation incident on the panels is 800 W/m2 . What is the increase in temperature of 25.0 kg of water in a 1.00-h period by a 3.40-m2-area collector? (cw = 4 186 J/kg/°C)
a. 93.6°C
b. 6.88°C
c. 23.4°C
d. 46.8°C
e. 17.5°C
c
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According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would
A) increase by a factor of 3. B) decrease by a factor of 3. C) increase by a factor of 9. D) decrease by a factor of 9. E) stay the same.
Which of the following planets has an exosphere?
A) Mercury B) Venus C) Earth D) Mars E) all of the above
In addition to being the largest moon in the solar system, Ganymede, the Galilean moon of Jupiter, is
A) the only moon to have its own internal magnetic field B) the only moon to have its own atmosphere C) more geologically active than the Earth D) the only moon to show evidence for a subsurface ocean of water
A roller coaster starting from rest descends 35 meters in its initial drop and then rises 23 meters when it goes over the first hill, which has a circular shape over the top
If a passenger at the top of the hill feels an apparent weight equal to one-half of her normal weight, what is the radius of curvature of the first hill? Neglect any frictional losses.