Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him? 100J 150J 50J 200J2. "Power" is defined as ________ The sum of potential and kinetic energy The energy necessary to do work The velocity of an object squared The rate at which work is done3. A machine gun fires 60 bullets per minute, with a velocity of 700m/s. If each bullet has a mass of 50g, find the power developed by the gun. 122.5W 1225W 12250W 122W4. A block with a mass of m crosses a rough horizontal surface at a constant speed of v. The coefficient of kinetic friction between the block and the surface isµ. How much power must be produced in order to overcome the friction force? µmg µg mg µmgv5. If you have to push a car forward, what are the forces acting on you? Only gravity. The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you. Your own muscles push you down. No forces act on you.6. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s^{2}): 5000 J 5 J 500 J 50 J7. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done? Infinity Sinθ Zero Constant8. Which of the following is not a unit for power? Watt Horsepower Newton-meter per second Joule – second9. A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car. Becomes four times to that of the initial Remains the same Becomes 16 times to that of the initial Becomes twice to that of the initial10. A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g=9.8m/s^{2}) 400J 250J 1960J 2514J11. The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be: 25 5 2.5 0.2512. An object that has potential energy has this energy because of its ____ Speed. Momentum. Acceleration. Location13. Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____. Four times as far as the slower arrow. The same distance as the slower arrow. Twice as far as the slower arrow. More than four times as far as the slower arrow.14. A car travels with a constant speed of 15 m/s. The car’s engine produces a 4000 N pushing force in order to keep the speed constant. How much power isdeveloped by the engine? 600 W 60000 W 60 W 6000 W15. When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero. True False16. A feather and a coin dropped in a vacuum fall with equal _____. Accelerations Momenta Kinetic energies Forces17. The type of energy possessed by a simple pendulum, when it is at the mean position is: Sound energy Kinetic + Potential energy Potential energy Kinetic energy18. What happens to the total energy of a moving object if all the applied forces are conserved? The velocity is required to answer this question It decreases It remains constant It increases19. Two identical arrows, one with twice the kinetic energy of the other, are fired into a hay bale. The faster arrow will penetrate _____. More than four times as far as the slower arrow. Twice as far as the slower arrow. The same distance as the slower arrow. Four times as far as the slower arrow.20. A bullet fired from a gun can pierce a target due to its ___________ Mechanical energy Kinetic energy Acceleration Heat energy21. For a collision to occur, the actual physical contact is necessary. False True22. For a body moving in a circular path, the work done by the centripetal force is ________ Constant Negative Positive Zero23. The kinetic energy of an object will increase the most if you _______________ Double the mass of the object Double the temperature of the object Double the velocity of the object Double the potential energy24. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 10^{7} kW? 9g 9.6g 10g 2g25. If an object has kinetic energy, then it also must have ____ Speed Acceleration Force Impulse26 out of 25Time is Up!