estate University-PHYS 251-Spring17-ETOPI Activities and Due Dates I Hw Energy S

Question

estate University-PHYS 251-Spring17-ETOPI Activities and Due Dates I Hw Energy Score Not set A 169/100 G3l8/2017 09:30 AM Gradebook te Print Calculator Periodic Table Question 27 of 28 Sapling Learning Map A Sir Dudley the Dextrous is loading cannons on top of he to the edge of the tower preparation for an xpected attack. He slips, 10.0 falls to the ground takes the cannonball 1.65 seconds to fall to the ground, and air resistence is negligible. How much work is done by gravity on the falling cannonball? Number During the fall, what is the average power transfer to the cannonball due to the force of gravity? Number Next Exit

Explanation / Answer

Fall distance = 1/2 (t^2 x g) = 13.35 metres.
It's AN 10 kg. cannonball.
Gravitational force = (g x 10) = 9.8 x 10 = 98 N.
Work done by gravity = (98 x 13.35m) = 1308.3 Joules.
Pwer average = (1308.3/1.65) = 792.909W.

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