A Carnot engine operates between reservoirs at 550K and 300K, discarding 1500 J of heat in each cycle
(a) What is the engine's efficiency?
(b) How much heat is supplied to the engine by the hot reservoir in each cycle?
What will be an ideal response?
(a) 45.5% (b) 2750 J
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Looking for an Earth-size planet around a nearby star (besides the Sun) is like looking for a pinhead located
A) across the street. B) thousands of kilometers away. C) across the length of a football field. D) a few hundred kilometers away.
A 2.0-m straight wire carrying a current of 0.60 A is oriented parallel to a uniform magnetic field of 0.50 T. What is the magnitude of the magnetic force on it?
A) zero B) 0.15 N C) 0.30 N D) 0.60 N
Which of the following statements is incorrect?
a. Capacitance is always positive. b. The symbol for potential difference between the plates of a capacitor is . c. Water is a polar molecule. d. When a dielectric is placed in a capacitor it serves to reduce the electric field. e. Nonpolar molecules cannot be used for dielectric material in a capacitor.
The atoms that make up a newborn baby were made
1) in the mother's womb, 2) from the food that the mother ate, 3) in the ancient stars, While all atoms heavier than copper were manufactured by processes 4) photosynthesis. 5) atomic fabrication. 6) supernova explosions. 7) radioactivity. 8) none of these.