Answer: After serving as Second Lady from 1981 to 1989, Barbara Pierce Bush served as First Lady of the United States when her husband George H. W. Bush won the Presidency. She is also the mother of the 43rd President, George W. Bush, and of Florida's 43rd Governor, Jeb Bush.
Explanation:
This question is asking: Why does gravity occur? why will your notebook get pulled towards you?
Answer:
Explanation:
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Refer to the diagram shown below.
For dynamic balance,
1.5W - 2.5F = 0
W = (2.5*F)/1.5
= (2.5*40)/1.5
= 66.667 N
Because the lever is 80% efficient, the actual maximum load that can be lifted is
0.8*66.667 = 53.3 N
Answer: D. 53.3 N