Estimation: Estimate the number of times the earth will rotate on its axis during a human's lifetime.
A. 3 × 104
B. 3 × 105
C. 3 × 106
D. 3 × 107
E. 3 × 108
Answer: A
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The ______________number in the periodic table is equal to an element’s number of valence electrons.
Fill in the blank(s) with the appropriate word(s).
A person would like to pull a car out of a ditch. This person ties one end of a chain to the car’s bumper and wraps the other end around a tree so that the chain is taut. The person then pulls on the chain perpendicular to its length, as shown in the picture. The magnitude of the force that the chain exerts on the car in this situation is
A. Much smaller than the force the person exerts on the chain. B. About equal to the force the person exerts on the chain. C. Much bigger than the force the person exerts on the chain.
A current may be induced in a coil by
A. moving one end of a bar magnet through the coil. B. moving the coil toward one end of the bar magnet. C. holding the coil near a second coil while the electric current in the second coil is increasing. D. all of the above. E. none of the above.
The estimated age of the Milky Way Galaxy is about 13 billion years.
Answer the following statement true (T) or false (F)