The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process?
a. conduction
b. radiation
c. convection
d. vaporization
a
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You wish to read from a single lightbulb in a lamp at your desk. In order to get the same brightness on the page from a 25 W bulb as you can from 100 W bulb, how much closer do you need to bring the lamp to your book? Assume that the light bulbs are equally efficient.
A. 1/2 the distance B. 1/8 the distance C. 1/4 the distance D. 1/16 the distance
The strong force is the force that
a. binds electrons to the nucleus in an atom. b. holds the moon in orbit around Earth. c. creates the magnetic field associated with sunspots. d. produces the extremely high temperatures in the solar corona. e. binds protons and neutrons together to form a nucleus.
Many of the brightest stars we see are only a few million years old
Indicate whether the statement is true or false
A bucket of water with total mass 20.0 kg is attached to a rope, which in turn is wound around a 4.00-cm radius cylinder at the top of a well. The bucket is raised to the top of the well and released. The bucket is moving with a speed of 8.00 m/s upon hitting the water surface in the well. What is the angular speed of the cylinder at this instant?
a. 64.0 rad/s b. 50.3 rad/s c. 200 rad/s d. 126 rad/s e. 393 rad/s