Which is a key difference between electric charges and magnetic poles?
a. Electric charges can be separated while magnetic poles always occur together as opposite poles of equal strength.
b. Magnetic monopoles exist but isolated electric charges are never found.
c. Like electric charges repel but like magnetic poles attract.
d. An electrically charged rod attracts an electrically neutral object but a magnet does not attract and unmagnetized chunk of iron.
e. In electricity, unlike charges repel, but in magnetism, unlike poles attract.
a
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In solving a physics problem you end up with m in the numerator and m/s in the denominator. The units for your answer are
A) m2/s. B) m2. C) m. D) s. E) 1/s.
The general chemical equation for photosynthesis is shown below. Through this reaction are the oxygens of the water molecules, H2O, oxidized or reduced?
6 CO2+ 6H2O ? C6H12O6+ 6 O2 A) The oxygens of the water molecules are oxidized. B) The oxygens of the water molecules are reduced. C) The oxygens of some of these water molecules are oxidized while others are reduced. D) The oxygens of the water molecules are neither oxidized nor reduced.
Rotational Kinetic Energy: A pencil that is 15.7 cm long is released from a vertical position with the eraser end resting on a table. The eraser does not slip as it tips over. Treat the pencil like a uniform rod. What is the angular speed of the pencil just before it hits the table?
A. 13.7 rad/s B. 7.23 rad/s C. 3.70 rad/s D. 24.5 rad/s E. 16.8 rad/s
Two charged objects attract each other with a certain force. If the charges on both objects are doubled with no change in separation, the force between them
A) becomes zero. B) doubles. C) halves. D) quadruples. E) increases, but we can't say how much without knowing the distance between them.