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An elephant lifts a fallen tree by exerting a force of 8.35 x 103 N upward. If she lifts the tree 1.95 m in 1.25 seconds, how much power does she use?
A 1.40 kg squirrel runs east across the ground for 7.00 meters. She climbs 0.650 meters before running west on a limb for 4.50 meters. She jumps up 0.990 meters onto another branch, travels west 4.55 meters. She stops and eats a nut. Calculate net work.
andy pulls a boat a distance of 14.8 meters along a dock using a rope that makes an angle of 25.0o with the horizontal. If she uses a force of 910 N, calculate work?
- Using the diagram below, calculate the kinetic energy of a skier at a height of 28.5 meters
- A. 0.00 J C. 28500 J
- B. 14250 J D. 35750 J
An empty freight car A of mA = 2.50 x 104kg coasts along a horizontal track at 2.70 m/s until it couples to a stationary car B of mB = 4.75 x 104kg. There is negligible friction with the track, and the brakes are off. What is the speed of the two cars as they move along the track after the interaction?
A 2270 kg safety test vehicle is traveling at 34.4 m/s when it slams into a brick wall. It takes 0.190 seconds for the vehicle to stop. What is the average force exerted on the test vehicle?
A 7.25 kg bowling ball moving at 5.75 m/s strikes a single pin (mass 1.50 kg) head on. The pin goes flying straight (same direction as the ball) at 9.75 m/s, what is the final velocity of the ball?
A book with a mass of 0.56 kg is resting on a shelf. One of the supports holding the shelf is loose and the shelf suddenly tilts to one side.. If the angle is 25.0o (measured from the horizontal), how fast would the book accelerate)
- Dogs pull a sled 755 meters using 85500 Joules of energy. Calculate average force.
Roofers need to move equipment onto the roof of a building. They have a machine that will pull a platform at varying accelerations. The rope used to pull the platform will snap if a force of 5550 Newtons is exceeded. The platform itself has a mass of 50.0kg. The equipment has a mass of 475 kg. What is the maximum acceleration the machine could lift the equipment without snapping the rope?
