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.
The party that dominated Mexico from 1920 to 1990 is the
A. PRI B. PAN C. Republicans D. Democrats
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