Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible)
The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10. Unfortunately, the skis run out of fuel after only 48 s. What is Jason's top speed?
A) 81 m/s B) 48 m/s C) 13 m/s D) 130 m/s
A
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Carnot Engine: An ideal Carnot engine operates between a warm reservoir at 233 K and a colder reservoir. During each cycle, this engine extracts 15.0 J of heat from the warm reservoir and does 4.0 J of work. What is the temperature of the colder reservoir?
A. 171 K B. 62 K C. 47 K D. 67 K
Some quasars show absorption spectra with a smaller redshift than their emission spectra; this indicates that:
A) we still don't understand redshifts. B) they are much closer than previously thought. C) there is cooler gas between us and the quasar. D) their black holes are still contracting. E) their black holes are still expanding.
A step-up transformer steps up voltage by ten times. Neglecting slight losses, if 100 W of power go into the primary coil, the power coming from the secondary coil is
A) 1 W. B) 10 W. C) 100 W. D) 1000 W. E) none of the above
How much heat (in kilocalories) is needed to convert 1.00 kg of ice at 0°C into steam at 100°C?
a. 23.9 b. 79.6 c. 564 d. 643 e. 720