A 100-N uniform ladder, 8.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.30 . What minimum angle can the ladder make with the floor before it slips?
a. 22°
c. 18°
b. 51°
d. 59°
D
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An umbrella has a tendency to move upward when it is windy principally because
1) moving air over the curved surface produces reduced pressure against its top. 2) air moves up into the "bowl" and pushes upward with increased pressure. 3) buoyancy increases with increasing wind speed. 4) the umbrella is simply pushed upward by the wind. This effect was first accurately described by 5) Galileo. 6) Newton. 7) Bernoulli. 8) Einstein. 9) Archimedes.
The Zeeman effect can be used to determine the _______ our Sun and other stars
a. rotation speed of b. mass of c. color of d. magnetic field on e. radial velocity toward or away from
Index of Refraction: The speed of light in a certain material is measured to be 2.2 × 108 m/s. What is the index of refraction of this material? (c = 3.0 × 108 m/s)
A. 1.1 B. 1.2 C. 1.4 D. 1.6 E. 1.8
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The ball is referred to at the two-second time. The acceleration is __________
Fill in the blank(s) with correct word