A planet speeds up in its orbit as it gets closer to the sun because of
A) the torque exerted on the planet by the sun.
B) conservation of energy.
C) conservation of momentum.
D) conservation of angular momentum.
E) inertia.
D
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Suppose two stars are identical except that one is twice as far away from us as the other. Which statement is true?
A) Both stars have the same apparent brightness, but the luminosity of the closer star is four times as great as that of the more distant star. B) Both stars have the same luminosity, but the apparent brightness of the closer star is twice as great as that of the more distant star. C) Both stars have the same luminosity, but the apparent brightness of the more distant star is four times as great as that of the closer star. D) Both stars have the same luminosity, but the apparent brightness of the closer star is four times as great as that of the more distant star.
A 3. ? resistor is connected in parallel with a 6. ? resistor. This pair is then connected in series with a 4. ? resistor. These resistors are connected to a battery
What will happen if the 3. ? resistor burns out, i.e., becomes an infinite resistance? A) The current in the 4. ? resistor will drop to zero. B) The current in the 6. ? resistor will increase. C) The current provided by the battery will not change. D) The power dissipated in the circuit will increase.
All the following statements about Venus are true. Which one offers evidence of a global repaving about a billion years ago?
A) Venus's largest features are three elevated regions that look somewhat like continents. B) Venus has many circular features, called coronae, which appear to be tectonic in origin. C) Venus appears to lack any water that could lubricate the flow of rock in its crust and mantle. D) Venus has relatively few impact craters and these craters are distributed fairly evenly over the entire planet.
The position of a particle as it moves along the x axis is given by x = 15e?2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s?
a. 22 m/s b. 60 m/s c. 8.1 m/s d. 15 m/s e. 35 m/s