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# physics angular velocity question watch

1. an electric motor is lifting a mass via a system of pulleys. The motor is powered by voltage source of 230V. The diameter of the motor winding reel is D = 5cm and a mass M = 100kg isi being lifted with speed u - 0.5 m/s. The mass of pulleys and the strings can be neglected.

What is the angular velocity of the motors winding reel?

I tried using the equation w = v/r with r= 0.025m and v = u - 0.5 m/s
but I dont know how to get an actual answer... help?
2. (Original post by IDontKnowReally)
an electric motor is lifting a mass via a system of pulleys. The motor is powered by voltage source of 230V. The diameter of the motor winding reel is D = 5cm and a mass M = 100kg isi being lifted with speed u - 0.5 m/s. The mass of pulleys and the strings can be neglected.

What is the angular velocity of the motors winding reel?

I tried using the equation w = v/r with r= 0.025m and v = u - 0.5 m/s
but I dont know how to get an actual answer... help?
question looks a lot like P15 here https://www2.physics.ox.ac.uk/sites/...f_21027.pdf#15

in which case the mass is being lifted at u=0.5 m/s not at u-0.5 m/s

if you've got a different question with similar wording...if you aren't given a value of u and you can't work out what u is from some other information given, you won't be able to give a numerical answer.

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