Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. "Power" is defined as ________The energy necessary to do workThe velocity of an object squaredThe rate at which work is doneThe sum of potential and kinetic energy2. 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?µmgvmgµgµmg3. 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:2.50.255254. Which of the following is an example of inelastic collision?Collision between two vehiclesA bullet fired into a wooden blockCollision between glass ballsCollision between two railway compartments5. If an object has kinetic energy, then it also must have ____AccelerationSpeedImpulseForce6. If a mass is at rest, what must be applied to cause it to move? KilogramsVectorsForceSpeed7. 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.1225W12250W122.5W122W8. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 107 kW?9.6g9g2g10g9. A bullet fired from a gun can pierce a target due to its ___________Heat energyMechanical energyKinetic energyAcceleration10. 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/s2)1960J400J250J2514J11. A feather and a coin dropped in a vacuum fall with equal _____. Kinetic energiesAccelerationsMomentaForces12. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive.TrueFalse13. For a body moving in a circular path, the work done by the centripetal force is ________PositiveConstantZeroNegative14. When a body is lifted, the work done by the gravitational force is positive.FalseTrue15. The type of energy possessed by a simple pendulum, when it is at the mean position is:Potential energySound energyKinetic + Potential energyKinetic energy16. A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force?30 N30000 N3000 N300 N17. If you have to push a car forward, what are the forces acting on you? Only gravity.Your own muscles push you down.No forces act on you.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.18. A person jumps to the ground from a platform 10 feet high. Which of the following is true? The person has less potential energy at the top of the platform than in the air.The person has more kinetic energy before they jump than after they jump.The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.19. What happens to the total energy of a moving object if all the applied forces are conserved?The velocity is required to answer this questionIt decreasesIt remains constantIt increases20. An object that has potential energy has this energy because of its ____LocationMomentum.Acceleration.Speed.21. For a collision to occur, the actual physical contact is necessary.FalseTrue22. 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. Remains the sameBecomes twice to that of the initialBecomes four times to that of the initialBecomes 16 times to that of the initial23. Collision between two carom coins is an example for ____Inelastic collisionOblique collisionPerfectly inelastic collisionElastic collision24. 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.FalseTrue25. When a massive body collides against a light body at rest ____The light body starts movingThe light body reboundsThe massive body comes to restThe velocity of the bodies get exchanged26 out of 25Time is Up! Time's up
