A hot air balloon has a volume of 2.00 × 103 m3 when fully inflated, and the air inside the balloon is always at atmospheric pressure of 1.01 × 105 Pa
because of the large opening used to fill the balloon and heat the air inside it. What is the mass of hot air inside the balloon if its temperature is 120°C? The universal gas constant is 8.314 J/mol•K. (Assume a molecular weight of 28.8 g/mol for air.)
A) 1780 kg
B) 5850 kg
C) 203 kg
D) 62.0 kg
A
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A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate. If the power output of the engine is 1620 W,
how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible.
What provides the energy (and so light and heat) of a star?
A. Continual explosions B. Atomic energy/nuclear reactions C. Lots of electricity D. Chemical reactions at the surface E. Gravitational contraction
Which of the following are the units of a henry and a farad, respectively?
A. J ? s2/C2 and C2/J B. V ? s/A and V/C C. V/(A ? s) and C/V D. N ? m/A2 and 1/J E. None of the above
The main constituent of the Martian atmosphere is
A) methane. B) helium. C) carbon dioxide. D) hydrogen. E) nitrogen.