Time Dilation: Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth. Compared to the twin who remained on Earth, the astronaut twin is
A. younger than the Earth-twin.
B. the same age as the Earth-twin.
C. older than the Earth-twin.
D. The ages cannot be determined from the information provided.
Answer: A
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Wire A is twice as long as wire B but is otherwise identical. Both have the same potential difference between their ends. How do the currents flowing in these wires compare?
A. /A = 4/B B. /A = 2/B C. /A = /B D. /A = (1/2)/B E. /A = (1/4)/B F. Other (specify) T. It is impossible to say given the provided information.
Atomic nuclei of almost all elements consist of
a. only neutrons b. protons and electrons c. neutrons and electrons d. only protons e. protons and neutrons
Two capacitors with capacitances of 2.0 and 3.6 ?F, respectively, are connected in series. The system is connected to a 40-V battery. What charge accumulates on the 2.0-?F capacitor?
a. 220 ?C b. 31 ?C c. 2 100 ?C d. 51 ?C e. 290 ?C
A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
a. 2.0 m/s2 down the incline b. 5.3 m/s2 up the incline c. 2.0 m/s2 up the incline d. 3.9 m/s2 down the incline e. 3.9 m/s2 up the incline