The direction of the Moon's orbit about Earth is
a. westward.
b. eastward.
c. clockwise, as viewed from above Earth's North Pole.
d. none of these.
b
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All of the volcanoes on Mars are shield volcanoes
Indicate whether the statement is true or false
A plastic hose stuffed more or less densely with steel wool and a source of water can act as a model for resistance and electric current in wires. Suppose two one-meter lengths of such a hose were stuffed identically with steel wool
Discuss how one could use this model to determine which of the following would have greater resistance: one length; two lengths connected one after another; two lengths connected side by side, both connected to one source of water. Speculate on the answers as best you are able.
How much heat energy is required to vaporize a 4.40-g ice cube at 0°C? The heat of fusion of ice is 80.0 cal/g. The heat of vaporization of water is 540 cal/g, and cwater = 1.00 cal/g/°C
a. 2 730 cal b. 3 170 cal c. 2 820 cal d. 3 520 cal e. 2 380 cal
If the momentum of an electron is 1.95 × 10-27 kg ? m/s,
what is its de Broglie wavelength? (h = 6.626 × 10-34 J ? s) A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm