Compared to the period of satellites in close Earth orbit, the periods of satellites farther away are
A. the same.
B. longer.
C. shorter.
D. none of the above
Answer: B
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A cart is pushed to the right by a 10-N force. At the same time, a boy pushes it to the left with a 5-N force. The net force exerted on the cart is
A. 5 N to the left. B. 10 N to the left. C. 10 N to the right. D. 5 N to the right.
Which of the following pairs is incorrect?
A) Water rationing - Conservation
B) Restrictions on oil drilling in the arctic - Preservation
C) Yosemite National Park - Preservation
D) Fuel efficiency mandates - Conservation
E) Recycling - Preservation
Which cells of the immune system are the first to attack invading viruses or bacteria?
A) B cells B) dendritic cells C) macrophages D) T cells
The party that dominated Mexico from 1920 to 1990 is the
A. PRI B. PAN C. Republicans D. Democrats