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Problems with solutions
| I.D |
Level |
Problem |
Problem Topic |
| 133 |
High school |
Every second , 1200 m^3 of water passes over a 100-m high waterfall . If 3/4 of the kinetic energy created by the falling water can be converted to electrical energy , what is the power output of the generating station ? . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 134 |
High school |
A comet of mass 8.38 x 10^15 kg strikes the earth at a relative speed of 30 km/s . Find the kinetic energy of the comet . Express your answer in "megatons of TNT" . One megatons of TNT releases 4.2 x 10^15 J of energy . The diameter of the crater caused by such an impact is proportional to the 1/3 power of the explosive energy , with a one-megaton . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 135 |
High school |
A 60-lb (267 N) girl slides all the way down a 20 feet (6.1-m) slide that makes an angle of 20 degrees with the horizontal . The coefficient of kinetic friction is 0.10 . Find the work done by the force of gravity . Find the work done by the force of friction . If she starts at the top with a speed of 1.5 ft/s , (0.457 m/s) , wh . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 136 |
High school |
Two particles , of mass M and 2M respectively , each moving with speed 3 m/s . collide head-on . Find their speeds immediately after the collision if the collision is perfectly inelastic . . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 137 |
High school |
A certain crane lifts a load of 1.0 Metric ton through a vertical distance of 25m in 9.0s . If the load is raised at a constant velocity , how much power does the crane supply ? If the load is then dropped a pilling at ground level , how much work can it do on the pilling ? . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 138 |
High school |
A 66 kg skier starts from rest at height H = 20 m above the end of the ski-jump ramp (as shown in the figure "click here") . As the skier leaves the ramp, his velocity makes an angle of 'theta = 21 degree' with the horizontal . Neglect the effects of air resistance and assume the ramp is frictionless .
a) What is the maximum height h of his j . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 139 |
High school |
As in the figure shown in "click here" a small block of mass m = 0.041 kg can slide along the frictionless loop-the-loop , with loop radius R = 15 cm . The block is released from rest at point P , at height h = 7R above the bottom of the loop . How much work does the gravitational force do on the block as the block travels from point P to . . . continues
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Work,Power & Energy |
| 140 |
High school |
A 2.0 kg block is thrown upward from a point 20 m above Earth's surface . At what height above Earth's surface will the gravitational potential energy of the Earth block system have increased by 500 J ? . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 141 |
High school |
A person pushes a 10 kg cart a distance of 20 meters by exerting a 60 newton horizontal force . The frictional resistance force is 50 newtons . How much work is done by each force acting on the cart ? How much kinetic energy does the cart have at the end of the 20 meters if it started from rest ? . . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 142 |
High school |
Assuming an efficiency of 25% for the muscle system in the process of converting food energy into mechanical work , how much energy would be used by a person of mass 75 kg . (weight 165 lb.) in the process of climbing four flights of stairs for a total height of 15 meters ? Find the answer in joules and convert to dietary calories (1 dietary calori . . . continues
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Work,Power & Energy |
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