A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 225 grams of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? (The heat of fusion of ice is 3.33 × 10^5 J/kg)
20.8 J (per second)
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Which of the following are irregularities in our solar system that must be explainable in models of planetary formation?
A) Venus' low rate of rotation B) Mars' north-south asymmetry C) the tilt of Uranus' rotation axis D) binary Kuiper Belt objects E) All of the above
Which of the following statements about lunar phases is true?
A) It is possible to have two full moons during November, but not during December. B) The full moon sometimes rises around midnight. C) The time between new moons is two weeks. D) The time from one new moon to the next new moon is the same as the time from first-quarter moon to third-quarter moon. E) It is possible to have two full moons during January, but not during February.
A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?
A) Mrg B) 2 Mrg C) D) E) /
Energy Conservation With Conservative Forces: In the figure, a ball hangs by a very light string. What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A, which is 1.0 m above the bottom of the swing?
A. 2.2 m/s B. 3.1 m/s C. 4.4 m/s D. 4.9 m/s