Meteor showers are
A) usually annual events, as the orbits again intersect.
B) caused by the Earth passing near the orbit of an Earthgrazing asteroid.
C) caused by the Earth passing near the orbit of an old short-period comet.
D) Both A and B are correct.
E) Both A and C are correct.
E
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When creating an animated GIF, you should specify whether the animation should ______, or repeat.
A. replay B. playback C. loop D. tween
A piece of iron of mass 0.12 kg is taken from an oven where its temperature is 336°C and quickly placed in an insulated copper can that contains 0.20 kg of water
The copper can has mass 0.50 kg, and it and the water in it are originally at a temperature of 20°C. Calculate the final temperature of the system, assuming no thermal energy is transferred to the surroundings. Use the following specific heats: 4190J/kg ? C° (water), 470 J/kg ? C° (iron), and 390 J/kg ? C° (copper).
A satellite moves east, taken as the positive x axis direction, at a speed of 0.5 c and a spaceship moves toward it (to the west) at a speed of 0.8 c as measured by an observer on the Earth. The speed of the satellite measured by an observer in the spaceship is
a. 8.7 c b. 0.21 c c. -0.21 c d. 0.93 c e. -0.93 c
The Wilkinson Mapping Project gave:
A) ?o = 1, but matter (dark and visible) is only 27% of this, the rest is dark energy. B) a closed universe, where dark matter triumphs over dark energy. C) an exact picture of the nature of dark energy. D) us proof that 90% of matter is dark, only 10% normal. E) the background cosmic temperature is 4.36 K.