A 30.0-kg object slides down a slope which is inclined 27.0° to the horizontal. What is the normal force on the object?
A) 133 N
B) 171 N
C) 262 N
D) 387 N
E) 398 N
C
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Which of the following forces is the weakest?
a. strong nuclear b. weak nuclear c. electromagnetic d. gravitational
The hot spots in double-lobed radio source
a. appear to coincide with the location of the central galaxy responsible for the jets. b. are where hot excited gas interacts with the intergalactic medium. c. are only found near quasars. d. produce enough visible energy to be imaged at visible wavelengths. e. are always perpendicular to each other.
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative to the ship must the spaceship launch a shuttlecraft in the forward direction so that it will be moving away from Earth at 98.7% the speed of light?
A) 0.91c B) 0.97c C) 0.93c D) 0.99c E) 0.84c
An electron has a much smaller mass than a proton. Is it possible for an electron and a proton to have the same de Broglie wavelength?
A. Yes, if the electron is moving much faster than the proton. B. Yes, if the proton is moving much faster than the electron. C. No, this is never possible.