Suppose you are observing a light bulb. In this context, which of the following is a difference between intrinsic brightness and apparent brightness?
A) The wattage of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its distance from you.
B) The size of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its wattage.
C) The distance from the source of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its size.
D) The visual wavelength of the light bulb tells you its intrinsic brightness, whereas the apparent brightness of the light bulb depends on its distance from a neighboring light bulb.
A
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Meteorites are valuable to astronomers because:
A) they may provide evidence about the process in which the solar system was born. B) they originated in other solar systems. C) they contain diamonds and gold. D) they reveal the contents of interstellar space. E) they prove that life can only exist on the Earth.
A 1.53-kg piece of iron is hung by a vertical ideal spring. When perturbed slightly, the system is moves up and down in simple harmonic oscillations with a frequency of 1.95 Hz and an amplitude of 7.50 cm
If we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging iron, what is the total mechanical energy of the system? A) 0.633 J B) 0.955 J C) 0.646 J D) 0.000 J E) 0.844 J
The nichrome heating element in an electric drier operates on 240 V and generates thermal energy at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%
(Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power is still 2.0 kW. B) The power increases to 2.2 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.
Static charge can build up quickly on an object ________
a. during days when the conditions are not humid b. when the object is in good electrical contact with the ground c. only when it is in contact with a good conductor d. only when the object is moving