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☆☆☆☆☆Cards in this guide (7)
How much heat energy is needed to convert 50 kg of water at 80 degrees Celsius to steam at 100 degrees Celsius
117,180,000
A jogger runs at an average speed of 5 ms for 3 minutes then finishes with an average speed of 4 ms for 2 minutes What is his average speed in ms for the run
4.6ms
A 14 kg cart is coasting down a street at a steady speed of 7 ms what is the kinetic energy of the cart
Kinetic energy = 1/2 M V2 = 0.5 x 14 x 49 = 343 joules
A rock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground What was the potential energy of the rock before it began to fall
4900
How much heat energy would it take to melt a 20 kg block of lead that was at 24 degrees Celsius
1,277,800 j
A 50 kg cannon ball is shot horizontally from a cannon at a speed of 80 ms At this speed its kinetic energy will be joules
Kinetic Energy = 1/2 M V2 = (25) (80)2 = 160,000joules.
A pulley system is used to lift a 2000 newton engine up a distance of 3 meters The operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor To lift the engine fi
250 newtons
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