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 12:30, lnbrown9018
An arrow is shot vertically upward at a rate of 180ft/s. use the projectile formula h=ā16t2+v0t to determine at what time(s), in seconds, the arrow is at a height of 420ft. round your answer(s) to the nearest tenth of a second.
Answers: 1
Mathematics, 21.06.2019 17:00, KHaire2077
In a sample of 2023 u. s. adults, 373 said franklin roosevelt was the best president since world war ii. two u. s. adults are selected at random from the population of all u. s. adults without replacement. assuming the sample is representative of all u. s. adults, complete parts (a) through (d). (a) find the probability that both adults say franklin roosevelt was the best president since world war ii. the probability that both adults say franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (b) find the probability that neither adult says franklin roosevelt was the best president since world war ii. the probability that neither adult says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (c) find the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii. the probability that at least one of the two adults says franklin roosevelt was the best president since world war ii is (round to three decimal places as needed.) (d) which of the events can be considered unusual? explain. select all that apply. the event in part left parenthesis a right parenthesis is unusual because its probability is less than or equal to 0.05. the event in part (b) is unusual because its probability is less than or equal to 0.05. none of these events are unusual. the event in part (c) is unusual because its probability is less than or equal to 0.05.
Answers: 3
Mathematics, 21.06.2019 23:00, grettelyesenia
Find the dimensions of the circle. area = 64Ļ in.Ā² r= in.
Answers: 1
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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