Suppose you and your sister travel at different speeds in space and you note a slowing of her clock. Compared with her clock your sister will notice that your clock runs
A) faster.
B) slower.
C) the same.
D) need more information
Answer: B
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The efficiency of a Carnot engine operating between 100°C and 0°C is most nearly:
a. 7%. c. 27%. b. 15%. d. 51%.
Power: A sand mover at a quarry lifts 2000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute. What minimum power must be supplied to this machine?
A. 520 W B. 3.9 kW C. 6.7 kW D. 4.3 kW E. 1.1 kW
If the energy of n = 5 is –0.544 eV and that of n = 2 is –3.40 eV in a hydrogen atom, a transition from n = 2 to n = 5 will absorb a photon of what energy?
Which of the following do winds on Mars NOT cause
A) global dust storms B) local dust storms C) hurricanes D) dust devils