A certain speed boat weighs 4,900 N. It can accelerate from 0 to 20 m/s in 5 seconds. (a) What is the mass of the boat? (b) What is the acceleration? (c) How large is the net force acting on the boat?
(a) 500 kg, (b) 4 m/s2, (c) 2,000 N
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Resistors in Combination: What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.
A. 950 ? B. 450 ? C. 392 ? D. 257 ?
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. How much tritium will be left after 30 years?
a. 0.20 kg b. 1.8 kg c. 0.18 kg d. 1.7 kg e. 4.1 kg
How does the prevailing model for activity explain the hot ejected gas seen in active galaxies?
A. It is energy released as matter is funneled into a black hole. B. It is gas evaporating from an accretion disk around a massive black hole. C. It is shot out of a black hole. D. It is material trapped between two orbiting black holes being gravitationally scattered. E. It is a rip in space-time from which Hawking radiation is released.
Venus' lack of magnetic field means that:
A) there is no lightning on Venus. B) the surface of Venus has no protection from the Sun's radiation. C) it doesn't have a liquid metallic core. D) Venus' upper atmosphere is permanently ionized. E) there are constant aurorae everywhere on Venus.