Which Lagrange points in the Earth—Moon system are stable?
A) L1 only
B) L4 and L5
C) L2 and L3
D) all are stable
B
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Electric power lines require convective cooling from the surrounding air to prevent excessive temperatures in the wire. If a 1 inch diameter line is wrapped with nylon to increase heat transfer with the surroundings, how much nylon can be wrapped around the wire before it begins to act as an insulator? The convective heat transfer coefficient is 5 Btu/hr?ft^2 ?ºF.
What will be an ideal response?
Which of the following is a key factor in explaining why many jovian moons have been more geologically active than the Moon or Mercury?
A) Jovian moons contain much more ice that can melt or deform at lower temperatures than can the rock and metal that make up the Moon and Mercury. B) The jovian moons are considerably larger than the Moon and Mercury and therefore have retained much more internal heat. C) The jovian moons probably have far more internal heat generated by radioactive decay than do the Moon or Mercury. D) Because of their greater distances from the Sun, the jovian moons receive much less heat from the Sun.
Gamma rays travel faster than visible light.
a. true b. false
When a damping force is applied to a simple harmonic oscillator which has angular frequency ?0 in the absence of damping, the new angular frequency ? is such that
A. ??0. D. ?T?0T0.