Can You Calculate Tension and Earth's Angular Attributes?

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The discussion centers on two physics problems involving tension in a string and Earth's angular attributes. The first question asks for the tension in a string when a mass is whirled in a vertical circle, with a specific length and angular speed provided. The second question involves calculating the Earth's angular speed, energy, torque, and average power required to reach its current speed from rest. Participants emphasize the importance of showing work before receiving answers, adhering to forum guidelines. A hint is provided to connect orbital velocity to centripetal acceleration for solving the first question.
iloveuok
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Hi Guys,

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
(i) Energy
(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)

Thanks.

Regards,
Alex
 
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We cannot just give you the answers, that's against the PF Guidelines. Please show us what you have done so far.

regards
marlon

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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