Toy attached end of a horizontal string and rotate in circle
A 0.30 kg toy is attached to the end of a horizontal string and rotated in a circle of radius 1.6 m on a frictionless horizontal surface. If the string will break when the tension in it exceeds 56 N, what is the maximum speed the toy can have?
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(a) What is the initial angular velocity of the turbine? (b) How much time elapses while the turbine is speeding up?
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If the random variable z is the standard normal score and a > 0, is it true that P(z > -a) = P(z < a)? Why or why not? & Find the (two) z-scores that bound the middle 40% of the standard normal distribution.
What is the probability that the average length of a randomly selected bundle is less than 520cm? Also, what is the probability that the average length of a randomly selected rod is less than 520cm.
From a well shuffled pack of cards, four cards were drawn( one card at a time) with replacment technique. What is the probability all cards are black.
What is the probability of selecting a sample of 50 one-bedroom apartment and finding the mean which is at least $6000.
The scores of 12th-grade students on the National assessment of Educational Progress test have a distribution that is N(300,s=35).
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