If two slide projectors are connected in parallel across the same 120 volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word
12 amperes
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Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. a and b e. all of the above
At what rate is thermal energy generated in the 20-? resistor when ? = 20 V?
A. 6.5 W B. 1.6 W C. 15 W D. 26 W E. 5.7 W
How can astronomers measure the period of a planet's orbit?
A) by measuring the time between peaks in the star's velocity curve B) by timing the cycle of small changes in a stars position on the sky C) by measuring the time between repeated transits D) all of the above
The Schwarzschild radius of a black hole is that radial distance from the center of a sphere within which not even light can escape
It was first discovered mathematically by Schwarzschild in 1916 after Einstein published his general relativity theory. It can be calculated from a star's mass M as: R = 2GM/c2. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be A) the same. B) twice as much. C) half as much. D) four times as much. E) one-fourth as much.