A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart
B) the rod will lose its charge
C) electroscope leaves will tend to collapse
D) electroscope will become discharged
E) nothing noticeable will happen
C) electroscope leaves will tend to collapse
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Carnot Engine: A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day, and the heat of combustion of coal is 3.3 × 107 J/kg. The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C.(a) What is the overall efficiency of the plant for generating electric power?(b) How much thermal energy is exhausted each day?(c) Using the same heat reservoirs, what is the maximum possible efficiency for a heat engine?
What will be an ideal response?
A simple magnifier of refractive power 15.0 D is used to observe a beetle on a student’s desk. If the image of the beetle is formed at her nearpoint of 25 cm, how far is the beetle from the magnifier?
A. 50 cm B. 6.3 cm C. 4.2 cm D. 17 cm
Which of the following is not a general feature of the Moon's surface?
a. Dry ocean plains b. Multiring basins c. Secondary craters d. None of these; that is, all these features are present
A single force acts on an object and the torque caused by the force is nonzero about some point. Is there any other point about which the torque is zero?
1.Yes, under any circumstance there is such a point. 2.No. 3.Yes, but only if the force is centripetal. 4.It is impossible to determine.