Why was it important to have a "boring" patch of sky for the Hubble Deep Field?
A. To minimize the number of objects in the view that were local to our own galaxy.
B. To first take a "flat field" for use in comparison to a more interesting part of the sky.
C. To avoid catching a comet or asteroid that could end up a blur streak across the entire image.
D. To prevent the Hubble Space Telescope overheating from bright light sources.
E. Honoring the memory of Edwin Hubble, who first searched this same part of space.
Ans: A. To minimize the number of objects in the view that were local to our own galaxy.
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Earth is closer to the Sun in winter than in summer. The orbital speed of Earth about the Sun is therefore faster during the
1) summer. 2) winter. 3) is the same for all seasons. Correspondingly, the gravitational force between the Sun and Earth is strongest during 4) summer. 5) winter. 6) is the same for all seasons.
Light takes approximately one second to travel from Earth to the Moon. This means that the Moon is approximately
A) 1 astronomical unit from Earth. B) 1 light-year from Earth. C) 3000 kilometers from Earth. D) 300,000 kilometers from Earth. E) near the top of Earth's atmosphere.
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
A. 2.0 A B. 1.0 A C. 3.0 A D. 9.0 A E. 1.5 A
An x-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the velocity of the ball is zero. We can be positive that at t = 6 s,
a. the slope of the curve is non-zero. b. the acceleration is constant. c. the ball has stopped. d. none of the above answers is always correct.