- #1
saltyload
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1. A 1000kg mass is lowered by a rope. If the mass is initially moving at 10m/s, and is decelerating at 1m/s2, what is the initial tension T in the rope?
2. T = mg
3. So I tried setting up T = mg, and then since it is decelerating the tension must be less than what it would be if it was in static equilibrium. Then I added ma to side T.
ma + T = mg
Ended up getting T = 9000N, but the answer is 11,000N.
What did I do wrong? I thought my thinking was correct. I thought about a mass in an elevator which would weigh less if elevator moved downward and weigh more if elevator moved up.
2. T = mg
3. So I tried setting up T = mg, and then since it is decelerating the tension must be less than what it would be if it was in static equilibrium. Then I added ma to side T.
ma + T = mg
Ended up getting T = 9000N, but the answer is 11,000N.
What did I do wrong? I thought my thinking was correct. I thought about a mass in an elevator which would weigh less if elevator moved downward and weigh more if elevator moved up.