Determine the distance to Proxima Centauri in light-years, if it is 1.3 pc away
d(ly) = 1.3 pc × 3.26 ly/1 pc = 4.3 ly
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How does an object’s rate of cooling vary with size?
a. A larger object cools more slowly than a smaller object. b. A smaller object cools more slowly than a larger object. c. Size has no effect on an object’s rate of cooling.
The magnetic field near a strong permanent bar magnet might be 500
A) microGauss. B) Tesla. C) Gauss. D) milliGauss. E) MT.
On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical properties of these materials?
A) density B) specific heat C) emissivity D) thermal conductivity E) mass
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.