The gravitational force between two metal spheres in outer space is 2000 N. How large would the force be if the two spheres were four times as far apart?
A. 32,000 N
B. 8000 N
C. 500 N
D. 125 N
Answer: D. 125 N
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Widmanstätten patterns are mostly seen in stony meteorites
Indicate whether the statement is true or false
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? 1 Ci = 3.7 × 1010 Bq
A) 5.8 × 109 nuclei B) 8.5 × 108 nuclei C) 6.3 × 108 nuclei D) 3.2 × 109 nuclei E) 2.4 × 109 nuclei
A 5.00-m-long 200-N uniform ladder, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall. The coefficient of static friction between the ladder and the floor is 0.200
How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip? A) 1.50 m B) 1.26 m C) 1.05 m D) 3.95 m E) 4.56 m
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
a. concave mirror farther than one focal length from the burning candle. b. a convex mirror farther than one focal length from the burning candle. c. a biconcave lens farther than one focal length from the burning candle. d. a concave mirror closer than one focal length to the burning candle. e. a convex lens closer than one focal length to the burning candle.