A transformer changes the 10,000 V power line to 120 V. If the primary coil contains 750 turns, how many turns are on the secondary?
A)
3
B)
0
C)
9
D)
6.3 × 104
E)
2.1 × 104
C
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The age of our solar system is approximately
A) 10,000 years. B) 3.8 million years. C) 4.5 million years. D) 4.5 billion years. E) 14 billion years.
Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed
A) doubles. B) halves. C) remains the same.
When you apply an alcohol swab to your skin, it feels cool because
A. the density of alcohol is less than 1 g per cm3. B. your skin transfers a bit of heat to the liquid alcohol and the alcohol evaporates. C. germs are destroyed by the alcohol, and they give off cold heat as they die. D. of nothing-it is an illusion, because evaporating alcohol is actually hotter than liquid alcohol.
The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
A. 2.4 m/s B. 3.0 m/s C. 5.4 m/s D. 7.7 m/s E. 49 m/s