When you are in a high-flying jet plane, does either your weight or your mass differ from their normal value as measured on the ground?
A) No, both your weight and your mass are exactly the same as on the ground.
B) Both your weight and your mass are slightly reduced.
C) Both your weight and your mass are slightly increased.
D) Your weight is slightly reduced, but your mass is unchanged.
E) Your weight is slightly increased, but your mass is unchanged.
D
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A heavy ball hangs by a string, with a second string attached to its bottom. A slow pull on the bottom string breaks the
A) top string. B) bottom string. C) top or bottom string equally.
We now know that Newtonian physics is not valid [i.e., not correct] for
A) gases. B) very fast-moving objects. C) solid objects. D) stationary objects. E) Nonsense--Newtonian physics has never been found to be incorrect.
In a two-object inelastic collision, how are the final velocities of the objects related?
A. There is no relation. B. The larger mass has the larger velocity. C. The larger mass has the smaller velocity. D. They each have the same velocity.
Liquid oxygen (LOX) for the Space Shuttle can be stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. Institute of Standards and Technology’s Cryogenic Division that has an effective thermal conductivity of 0.00012 W/(m K). If the outside temperature is 20°C on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.
GIVEN
FIND
- The minimum thickness of the insulation (L) to keep evaporation rate below 0.2 kg/h
ASSUMPTIONS
- The thickness is small compared to the sphere diameter so the problem can be considered one
dimensional
- Steady state conditions prevail
- Radiative heat loss is negligible
SKETCH
