How many valence electrons does an atom of phosphorus have?
a. 15
b. 5
c. zero
d. 3
b
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If the position versus time graph of an object is a vertical line, the object is
A) moving with constant non-zero speed. B) moving with constant non-zero acceleration. C) at rest. D) moving with infinite speed. E) none of the above
The most widely accepted system of measurement is the metric system
a. True b. False Indicate whether the statement is true or false
What kind of a gas cloud can collapse and form stars?
A.) A very hot gas cloud that has a huge internal pressure can collapse and form stars. B.) A gas cloud that has a mass less than 10 solar masses can collapse and form stars. C.) The gas cloud must have a mass that exceeds the Jeans mass so that gravity overcomes the internal pressure in the cloud. D.) The gas cloud must have a mass that is smaller than the Jeans mass so that gravity overcomes the internal pressure in the cloud. E.) A black hole can collapse and form stars.
On a hot day, you open the refrigerator and experience a refreshing feeling when the cool air comes in contact with your body
You think to yourself "I think that I'll just keep the refrigerator door open and stand in front of the refrigerator all day today to stay cool. I might even bring a chair." Will this work? Explain why or why not.