The Concorde's exterior is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6K-1. At 15°C, the Concorde measures 62.1 m in length
When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the Concorde?
A)
20 cm
B)
24 cm
C)
28 cm
D)
32 cm
E)
36 cm
C
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A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2500 J of heat to the hot reservoir, requiring 1500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no) b. 1.0 (yes) c. 1.5 (yes) d. 1.5 (no) e. 2.5 (no)
Which of the following can actually escape from inside a black hole's event horizon?
A) neutrinos B) electrons C) very high energy gamma-rays D) gravitons E) None of the above
Which of the following is a feature of quantum physics that is not valid according to Newtonian physics?
A) The second law of thermodynamics. B) The universe is made of tiny particles. C) The future is entirely determined by the present. D) The principle of conservation of energy. E) Nature is non-local, i.e., separated objects are sometimes instantaneously connected with each other.
A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?
A) 1.2 A B) 2.5 A C) 4.9 A D) 7.6 A E) 9.8 A