|Feb14-06, 07:01 AM||#1|
Need some help to answer Some questions
I face some problems answering below questions. Anyone can help to answer?
Q1: One end of a string of length 1.0m is tied to body of mass 0.5kg. It is whirled in a vertical circle. If its angular speed is 3rev/s, calculate the tension in the string at the highest and lowest points.
Q2: (a) Calculate the angular speed of the earth.
(b) Calculate the
(ii) Torque and (iii) average power
required to accelerate the Earth in 1 day from rest to its present angular speed.
(Mass of the Earth : 6x10 power 24 kg , radius of erath = 6400km)
|Feb14-06, 07:21 AM||#2|
We cannot just give you the answers, that's against the PF Guidelines. Please show us what you have done so far.
ps : as a hint to Q1. Can you link the orbital velocity to an acceleration (centripetal) ? There is a nice and easy formula for this. If you do this, you are on your way...
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