A sphere is constructed of two concentric pieces. The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3
The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm. The outer shell has a density 9000 kg/m3.
(a) What is the mass of this sphere?
(b) What is the average density of this sphere?
(a) 281 kg
(b) 8.38 × 103 kg/m3
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A star's luminosity depends only on the star's
a. distance and diameter. b. temperature and distance. c. distance. d. temperature and diameter. e. apparent magnitude.
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
The largest component of ionizing radiation the average American receives is from:
a. radon b. cosmic rays c. TV d. medical x-rays e. terrestrial sources
Two resistors can be either connected to a battery in series or in parallel. In which case, if either, is the equivalent resistance the smallest?
a) When the two resistors are wired in parallel, the equivalent resistance is less than if they are wired in series. b) When the two resistors are wired in series, the equivalent resistance is less than if they are wired in parallel. c) Both series and parallel wiring will result in the same equivalent resistance. d) It is not possible to know which method of wiring will result in the lowest equivalent resistance without knowing the values of the two resistances.