If an object is located 20 m to the right of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right.
B. 30 m to the right.
C. 25 m to the right.
D. 20 m to the right.
E. 10 m to the right.
D. 20 m to the right.
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What is a central dominant galaxy?
A) a galaxy around which many other smaller galaxies orbit B) a giant spiral galaxy that exerts large tidal forces on other nearby galaxies C) a spiral galaxy from which many smaller galaxies form when it is stripped apart by tidal forces D) a giant elliptical galaxy at the center of a dense cluster E) a hypothesized galaxy type that no longer exists but once dominated the structure of the universe
A star has absolute luminosity equal to that of the sun but is 10 pc away from the Earth
By what factor will it appear dimmer than the sun? The earth is 1.5 × 108 km from the sun, and 1 parsec is equal to 3.09 × 1016 m. A) 2 × 10-9 B) 2 × 10-11 C) 2 × 10-15 D) 2 × 10-13
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.
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity of 2 m/s. What is the work done by this person?
A) 0 J B) 20 J C) 200 J D) 1000 J E) None of the other choices is correct.