If the same-sized force is made to act over a smaller area, the pressure is
a. decreased.
b. increased.
c. unchanged.
d. dependent upon the shape of the area.
b
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Imagine an advanced civilization living on a planet orbiting at a distance of 10 AU (1.5 billion kilometers) from a close binary star system that consists of a 15 MSun red giant star and a 10 MSun black hole. The black hole is surrounded by an accretion disk. Sometime within the next million years or so, the civilization's planet is likely to be doomed because
A) the red giant will probably supernova within the next million years. B) jets of material shot out of the accretion disk will shoot down their planet. C) the red giant star, which provides most of energy the civilization needs to exist, will soon be destroyed in the accretion disk. D) tidal forces from the black hole will rip the planet apart. E) the planet's orbit will gradually decay, as it is sucked in by the black hole.
A monster turnip (assumed spherical) weighing in at 0.45 kg is dropped into a cauldron of water boiling at atmospheric pressure. If the initial temperature of the turnip is 17°C, how long does it take to reach 92°C at the center? Assume that
GIVEN
FIND
Time needed to reach 92°C at the center
ASSUMPTIONS
SKETCH
Complete the following sentence: When a positively-charged particle is released from rest in a region that has a magnetic field directed due east, the particle will
a) remain at rest. b) be accelerated due east. c) be accelerated due north. d) be accelerated upward. e) be accelerated downward.
A uniform pressure of 21 × 10^5 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 × 10^10 N/m2)
a. 2.4 × 10^-2 % c. 8.4 × 10^-2 % b. 1.5 × 10^-3 % d. 0.5 × 10^-3 %