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October 20, 2014

Homework Help: Phyics help

Posted by Anonymous on Saturday, April 9, 2011 at 8:27pm.

I have a few physics questions:
1. How much mechanical work is done by a weightlifter holding a mass of 100 kg, 2.0m above the floor for 3.0 s? Explain ur answer.

2. Calculate the force needed to do 2.0 kJ of work to push a load of bricks 10m?

3. A carpenter applied a force of 60N horizontally to push a plane 40cm along a piece of wood, how much work does he do?

4. A librarian does 8.0J of work to stack five identical books on top of each other. If each book has a thickness of 4.0cm what is the mass of each book?

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