A star whose parallax is 0.01 seconds arc is at a distance of 1000 pc
a. True
b. False
Indicate whether the statement is true or false
False
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Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
A. it has the same position and the same velocity as A. B. it has the same position and the same acceleration as A. C. it has the same velocity and the same acceleration as A. D. it has the same displacement and the same velocity as A. E. it has the same position, displacement and velocity as A.
A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?
A) 2.58 light-years B) 3.52 light-years C) 4.12 light-years D) 4.30 light-years
Astronomical alignments in antiquity on solstice and equinox sunrises and sunsets show us these builders had developed a ________ for farming
Fill in the blank(s) with correct word
At a certain point in space there is a potential of 400 V. What is the potential energy of a +2-?C charge at that point in space?
A) 80 × 10-6 J B) 800 J C) 400 J D) 200 J E) 8 × 10-4 J