Mathematics, 13.05.2021 23:00 lolhgb9526
Kate needs to lift a 500 N box of books onto a library shelf that is 3 meters high. She decides that the best machine to help her would be a set of fixed and movable pulleys known as a block and tackle. She applies an effort force of 100 N to the rope of the pulley and finds that she has to pull 18 meters of rope to get the box raised to the height of the shelf. What is the efficiency of the pulley system? is it 50, 83, or 65%?
Answers: 2
Mathematics, 21.06.2019 21:00
Describe how making an ‘and’ compound sentence effects your solution set
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Mathematics, 21.06.2019 23:00
Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122
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Mathematics, 21.06.2019 23:00
Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?
Answers: 2
Kate needs to lift a 500 N box of books onto a library shelf that is 3 meters high. She decides that...
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