Springs: A very light ideal spring stretches by 21.0 cm when it is used to hang a 135-N object. What is the weight of a piece of electronic equipment that would stretch the spring by 44.9 cm if you hung the equipment using the spring?
A. 289 N
B. 63 N
C. 176 N
D. 405 N
Answer: A
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A reversible engine takes in 40. Joules of heat, does 10. J of work, and expels 30. J of wasted heat during each cycle. If it is operated in reverse as a refrigerator, then its COP would be
A) 25%. B) 4. C) 3. D) 4%. E) 75%.
The magnetic flux through a coil changes steadily from 4.0 × 10-5 T ? m2 to 5.0 × 10-5 T ? m2 in 0.10 s. What emf is induced in this coil?
A) 5.0 × 10-4 V B) 4.0 × 10-4 V C) 1.0 × 10-4 V D) None of the given answers are correct.
In another solar system, a planet has an airless moon Zygo that is 4.0 × 105 m in diameter
Experiments reveal that a freely falling object at the surface of Zygo accelerates at 0.20 m/s2. What is the mass of Zygo? (G = 6.67 × 10-11 N ? m2/kg2) A) 2.4 × 1019 kg B) 4.8 × 1019 kg C) 1.2 × 1020 kg D) 2.4 × 1020 kg E) 4.8 × 1020 kg
Which of the following systems cannot be analyzed as a visual binary?
A) Binary stars that are separately visible in a telescope B) Binary stars that are about 2 AU apart C) Binary star systems having orbital periods of hundreds or thousands of years D) Binary stars orbiting so close to each other that they are not visible as separate stars