A package is dropped by a drone flying at 10 m/s at an altitude of 20 m when directly overhead its receiver. Neglecting the effects of air resistance, the package lands
A. 20 m from the receiver.
B. directly beneath the flying drone.
C. both of these.
D. none of the above
Answer: C
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Europe was the battleground for which wars during the 20th century?
A) World War I, but not World War II B) World War I and World War II, but not the Cold War C) World War I and the Cold War, but not World War II D) World War II, but not World War I E) World War I, World War II, and the Cold War
Two students need to make a decision about what sort of towels they should purchase in an attempt to generate the least amount of MSW. They agree that if they purchase paper towels, they will buy the thick, quilted brand
The best strategy to generate the least amount of MSW would be to purchase A) 5 bulk packages of 10 paper towels, for a total of 50 rolls of paper towels, and 10 garbage bags. B) 10 bulk packages of 5 paper towels, for a total of 50 rolls of paper towels, and 10 garbage bags. C) 25 packages of 2 paper towels each, for a total of 50 rolls of paper towels, and 10 garbage bags. D) one bag of 5 rags (about the size of 5 rolls of paper towels) that they can wash out and reuse.
How many atoms are in the smallest anhydride?
A) 5 B) 7 C) 9 D) 11
Which of the following is CORRECT regarding the Northwest and Northeast Passages?
A) They have been blocked since 2007 by increasing ice. B) They are expected to remain open until 2015. C) Until recently, sea ice blocked the routes, making them unavailable for shipping. D) They have been used for shipping and circumnavigation since the 1800s.