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一个大木箱原放在水平地面上．如图所示，现某人将它装在重为50N的小车将它从斜面底端沿斜面匀速推上顶端，整个过程历时10秒．已知木箱重400N，人对车的推力F=75N，斜面长4m，斜面高0.5m，人做功的功率______W；人做的有用功______J；人做的总功______J；斜面的机械效率为______．
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【简答题】我国被列为世界文化景观遗产的是_____。
【单选题】First Century Bank wants to earn an effective annual return on its consumer loans of 1 2 percent per year. The bank uses daily compounding on its loans. By law, what interest rate is the bank required...
A.
12 .23 percent
B.
10 .38 percent
C.
11 . 3 3 percent
D.
12 .72 percent
【简答题】Kermit Larson opened a law office on September 3 of the current year. During the first month of operations, the business completed the following transactions: Sep.3 Larson transferred $20,000 cash fro...
【简答题】Assignment 3 1_________ policemen, both 2_________ and the U. S., hardly recognize any 3_________ between their lives and what they 4_________ ---if they ever get home 5_________. Some 6_________ alm...
【简答题】Draw a graph or a picture about one of the first three laws: Everything is connected to everything else. Everything has to go somewhere. Nature knows best. (1. Tell us which law you are addressing. 2....
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