At which of the following temperatures would one liter of water weigh the most?
a. 2°C
b. 4°C
c. 8°C
d. 90°C
e. It would weigh the same at all these temperatures.
b
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Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
The most underlying feature of machines is
A) energy conservation. B) that energy input always equals energy output. C) that power input always equals power output. D) all of the above E) none of the above
What buoyant force does a 0.60-kg solid gold crown experience when it is immersed in water? The density of gold is 19.3 × 103 kg/m3 and that of water is 1000 kg/m3
A) 3.0 × 10-5 N B) 3.0 × 10-4 N C) 3.0 × 10-2 N D) 0.30 N
Starting from zero, an electric current is established in a circuit made of a battery of emf E, a resistor of resistance R and an inductor of inductance L. The electric current eventually reaches its steady-state value
What would be the effect of using an inductor with a larger inductance in this circuit? A) The steady-state value of the current would be larger, but it would take the same amount of time to reach it. B) The steady-state value of the current would be the same, but it would take more time to reach it. C) The steady-state value of the current would be the same, but it would take the same amount of time to reach it. D) The steady-state value of the current would be larger, but it would take more time to reach it. E) The steady-state value of the current would be the same, but it would take less time to reach it.