What kinds of light are these telescopes designed to detect?
A) radio waves
B) x-rays
C) infrared and visible light
D) ultraviolet light
E) light with extremely short wavelengths
A) radio waves
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The law of conservation of energy:
a. fails because energy increases too fast as the speed gets closer to c. b. does not apply to the theory of special relativity. c. applies to the theory of special relativity as long as the relativistic adjustment factor is correctly included. d. applies to any given inertial system but not to others. e. applies to the theory of special relativity in exactly the same form as it applies for small velocities.
We know interstellar matter exits because
A. the matter creates narrow absorption lines in the spectra of some stars. B. we can see it in dark clouds and clouds that absorb light. C. we can detect radio waves coming from atoms and molecules in the cold gas. D. some stars appear red in color despite their temperature. E. All of these choices are correct.
Two metal rods, one silver and the other copper, are both attached to a steam chamber, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other
The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. How much heat flows through the two rods in 60 s? The thermal conductivity of silver is 417 W/(m•K), and that of copper is 395 W/(m•K). No heat is exchanged between the rods and the surroundings, except at the ends. A) 20 kJ B) 39 kJ C) 47 kJ D) 49 kJ E) 11 kJ
A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a golf ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student's hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?
a. The train is moving at constant velocity. c. The train is slowing down. b. The train is speeding up. d. Whatever the cause, it cannot be any of the answers given.