(a) Standing above the North Pole and looking down at the earth, which way is th
ID: 1636126 • Letter: #
Question
(a) Standing above the North Pole and looking down at the earth, which way is the earth rotating: clockwise or counterclockwise? (b) Same question, but standing above the South Pole: clockwise or counterclockwise? A mass m hangs from a massless but amazingly strong string suspended from an elevator which is accelerating up at 9 g. What is the tension in the string in terms of m and g? Two particles in uniform circular motion in a zero-gravity environment, each with mass 3 kg, are connected by a string of length 4 meters. If both particles have tangential speed v = 5 m/s. w hat is the tension in the string in New tons?Explanation / Answer
As the mass hangs from elevator we consider elevator as the frame of reference.
When the elevator accelerating up at 9g, then a pseudo force (m.9g=9mg) act downward with the gravitational force mg.
So forces on the mass m are:
a) mg downward (gravitational)
b) 9mg downward (pseudo)
Total downward force on the mass m is
=(mg+9mg)
=10mg
This total downward force is equal to the tension in the string.
So tension in string is T=10mg
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