Rock Bucket
March 12th, 2005
500 Watt crane lifts bucket of rock 12 meters in 3 secs and@ constantspeed.What is the mass of the bucket&rock?
i dont understand how to get acceleration…
500 watts is 500 joules per second.
or 1500 joules in 3 seconds.
so 1500 joules lifts a mass 12 meters.
E = mgh
1500 = m*9.8*12
m = 12.8 kg
it says constant speed, so acceleration is not a factor.
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