If you draw a spacetime diagram, how will the worldline of an object that is stationary in your reference frame appear?
A) vertical
B) horizontal
C) slanted
D) curved
E) a circle
A) vertical
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A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
In which of the following cases does TANSTAAFL apply?
a. common use of land for grazing of sheep b. use of air in industrial processes c. use of water for power plant cooling d. TANSTAAFL applies in all the above cases. e. TANSTAAFL does not apply in any of the above cases.
Two capacitors with CA greater than CB, are connected in parallel with a battery. Which of the following is true?
a. There is the same charge stored on each capacitor. b. There is the same potential difference across both capacitors. c. There is more potential difference across CB. d. There is more potential difference across CA.
The cosmic background radiation
a. has a blackbody spectrum. b. has its peak emission in the microwave band. c. corresponds to a blackbody at a temperature of 2.726 kelvins. d. all of the above