Carnot Engine: An ideal Carnot engine has an efficiency of 83.0% and performs 4500 J of work every cycle. How much energy is discharged to the lower temperature reservoir every cycle?
A. 920 J
B. 830 J
C. 740 J
D. 3700 J
E. 5400 J
Answer: A
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Latent Heats: The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/kg ? K. If 300 kJ of heat are added to 442 g of aluminum at 100°C, what is the final state of the system? That is, how much is liquid, how much is solid, and what is its temperature?
What will be an ideal response?
A combination of a 2.0-? resistor in series with 4.0-? resistor is connected in parallel with a 3.0-? resistor. What is the equivalent resistance of this system?
A) 2.0 ? B) 3.0 ? C) 4.0 ? D) 9.0 ?
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the sun to push this solar sail. If a huge sail of area 6.00 × 10^5 m2 and mass 6000 kg were placed into orbit and turned toward the sun, what would be the force exerted on the sail? (Assume a solar intensity of 1380 W/m2.)
A physicist has two slits and two light sources to choose from, and wants to choose the configuration that will give the most data. The more maxima projected onto the screen, the more data. If slit 1 is smaller than slit 2, and the wavelength of source 1 is smaller than that of source 2, which ones should be used? e?
1.slit 1 and source 1 2.slit 2 and source 2 3.slit 2 and source 1 4.slit 1 and source 2