A person with an initial mass of 70 kg climbs a stairway and thereby rises 6.0 m in elevation. By how much does his mass increase by virtue of his increased potential energy? (c = 3.0 × 108 m/s)
What will be an ideal response?
4.6 × 10-14 kg
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In which of the following ways are Pluto and Eris more like comets than like any of the terrestrial or jovian planets?
A) They are made mostly of rock and ice. B) They sometimes enter the inner solar system. C) They have long tails. D) They have thick atmospheres.
Ice cream, when eaten, gives about 2100. Calories/kg to the body. On the other hand, the body must give back energy to warm it up to body temperature (37°C). Assuming ice cream has similar thermal properties to water:
(a) 1/2 kg produces how much energy? (b) 1/2 kg absorbs how much energy to reach 37°C? (c) What is the net gain or loss (eating 1/2 kg ice cream)?
The current in a wire varies with time according to the equation I(t) = 6.00 A + (4.80 A/s)t, where t is in seconds. How many coulombs of charge pass a cross section of the wire in the time period between t = 0.00 s and t = 3.00 s?
What will be an ideal response?
If the dark nebula are really dark, how do we know they are there?
What will be an ideal response?