Magazine paper is shiny because it is coated with clay. Why would it be wise to separate magazines from newspapers?
What will be an ideal response?
Clearly, different treatment would be necessary for clay-coated paper than for
paper not coated. Separation will be necessary at some stage in the processing.
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A simple pendulum of length 1.87 m has a mass of 120 g attached. It is drawn back 38.0° and then released. What is the maximum speed of the mass?
a. 1.44 m/s b. 3.93 m/s c. 2.74 m/s d. 2.79 m/s e. 0.249 m/s
Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find
A) a difference in temperatures. B) the breath from puckered lips is cooler. C) both of these D) neither of these
A radioactive sample has an activity R. For which of the following changes would the activity remain unchanged?
a. The number of radioactive nuclei in the sample is doubled. b. The half-life of the radioactive nuclei is doubled. c. The decay constant is doubled. d. A time period equal to two half-lives is allowed to elapse. e. All of the above changes result in a change in the activity.
The universe seems to be about how many years old?
a. 232 billion b. 6 billion c. 13.7 billion d. 1 billion