A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20 m/s horizontally and experiences no significant air resistance. The height of the platform above the ground is 2.0 m
What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground? A) 20 m/s
B) 6.3 m/s
C) 13 m/s
D) 15 m/s
E) 21 m/s
B
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Which of the following processes is due to
convection? a) The flowing of air from over cool water toward a warmer land area. b) The warming of the interior of a closed auto on a hot, sunny day. c) The frying of eggs in a hot pan. d) The direct warming of the Earth’s surface by the energy from the Sun.
The Ptolemaic model of the universe was heliocentric
Indicate whether the statement is true or false
The picture below shows a sphere as it looks at rest. Suppose the sphere is moving to the right at about 90 percent of the speed of light. Which figure below correctly shows the shape of the sphere as you would measure it?
A) Figure A B) Figure B C) Figure C D) Figure D E) Figure E
Suppose that two stars are identical in every way—for example, same distance, same mass, same temperature, same chemical composition, and same speed relative to Earth—except that one star rotates faster than the other
Spectroscopically, how could you tell the stars apart? A) The faster rotating star has wider spectral lines than the slower rotating star. B) The faster rotating star will have an emission line spectrum while the slower rotating star will have an absorption line spectrum. C) The peak of thermal emission will be at a shorter wavelength for the faster rotating star than for the slower rotating star. D) There is no way to tell the stars apart spectroscopically, because their spectra will be identical.