Suppose Joe is at rest and Moe is moving at almost the speed of light. Due to length contraction, Joe sees Moe's starship as only five inches long. What does Moe notice about his own starship?
A. It is longer and more massive
B. It is shorter but no fatter
C. It is both shorter and fatter
D. It appears to be normal to him
Answer: D
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A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 107 positive charges of magnitude |e| are now placed on the positive plate of the capacitor, the voltage between the plates changes by
A. ?5.0 V. B. ?1.1 V. C. 0 V. D. +1.1 V. E. +5.0 V.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m
One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C,
the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J) (a) What is the actual efficiency of this engine? (b) What is the power output of this engine? (c) What would be the maximum possible efficiency for an engine using the same temperature extremes?
Air at 100ºF, 70% relative humidity is to be conditioned to 75ºF and 60% relative humidity. Determine the partial pressure of the water vapor in the air at both states, the amount of water removed per lbm of dry air, and the lowest temperature to which the air must be cooled to accomplish this conditioning process.
What will be an ideal response?