A 200-N crate rests on a ramp; the maximum angle just before it slips is 21° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
a. 0.11
c. 0.38
b. 0.21
d. 0.47
C
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The variable r that appears in the equation F = Gm1m2/r2 is
a. the straight-line distance between the centers of the two masses. b. the rate at which both objects are moving. c. the radius of the first mass. d. the radius of the second mass.
The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3
A) 1.11 × 102 Pa B) 1.09 × 106 Pa C) 1.11 × 105 Pa D) 1.09 × 103 Pa E) 1.16 × 106 Pa
At 96°F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90% when the temperature is 96°F, the humidity is __________
Fill in the blank(s) with correct word
The broadening of spectral lines can be caused by:
A) density of the hot medium. B) thermal motion of the hot atoms. C) rotation of the star. D) magnetic fields of the star. E) All of the above