Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.After you drop the box and it has fallen half way, its potential energy is __________ and its kinetic energy is __________
Fill in the blank(s) with correct word
50 J, 50 J
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What was most surprising about SN1987A?
A) Its pulsar appeared within weeks of the explosion. B) The supernova was luminous enough to see with the naked eye. C) The supernova was not even in our own Galaxy. D) The parent star was a blue supergiant, much like Deneb or Rigel. E) It did not produce the flood of neutrinos our models had led us to expect.
The change in entropy of a mass m of a solid substance which has a latent heat of fusion LF and melts at a temperature T is
a. LFT/m b. mLF ln(T) c. mLFT d. mLF/T e. LF/mT
The lithosphere of a planet is the layer that consists of
A) material above the crust. B) material between the crust and the mantle. C) the rigid rocky material of the crust and uppermost portion of the mantle. D) the softer rocky material of the mantle. E) the lava that comes out of volcanoes.
The Earth has a radius of about 6,000 km. How long would it take for an object traveling at the speed of light to circle the earth? (Recall that the speed of light is 300,000 km/s)
A) 1/300,000 of a second (0.0000033 s) B) 1/ 6000 of a second (0.00015 s) C) 1/2 of a second (0.5 s) D) 1/50 of a second (0.02s)