What are the most abundant gases in Jupiter's atmosphere?
a) methane and ammonia
b) methane and hydrogen
c) hydrogen and ammonia
d) hydrogen and helium
e) water vapor and ozone
Ans: d) hydrogen and helium
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Compare the axial heat flux achievable by a heat pipe using water as the working fluid with that of a solid silver rod. Assume that both are 20-cm-long, that the temperature difference for the rod from end to end is 100°C and that the heat pipe operates at atmospheric pressure. State your other assumptions.
GIVEN ? Silver rod and a heat pipe, both 20-cm-long ? End-to-end temperature difference of 100°C ? Heat pipe operates at atmospheric pressure FIND (a) Axial heat flux for both rods ASSUMPTIONS ? Neglect heat pipe vapor pressure drop ? Horizontal operation for the heat pipe ? Perfect wetting of the heat pipe fluid, ? ?= 0 PROPERTIES AND CONSTANTS From Appendix 2, Table 12, the conductivity for silver at 63°C is ksilver = 424 W/(mK)
You hold a 5-newton rock motionless in your hand. Regarding the forces on this rock,
A) the net force on the rock is zero. B) the downward force of gravity is balanced by the upward force of air resistance. C) there are no forces of any kind acting on the rock, because it is not moving. D) the net force on the rock is 5 newtons, directed downward. E) the net force on the rock is 5 newtons, directed upward.
An unknown amount of gas is placed in a container with a moveable piston as shown below. The cross-sectional area of the container is A. When a mass M is placed on the piston, the height of the piston above the bottom of the container is h
An amount of energy Q is transferred by heat to the gas. (Q>0.) Put the magnitudes of the energy Q, work W, and change in internal energy ?E in order from smallest to largest.
You observe a rocket moving toward you. Compared to the passage of time measured by the watch on your wrist, the passage of time on the rocket's clock is
1.faster. 2.slower. 3.the same.