At which point would a skateboarder have the most kinetic energy?…

Question Answered step-by-step At which point would a skateboarder have the most kinetic energy?… At which point would a skateboarder have the most kinetic energy?At rest at the top of a half-pipe, just before gliding down the ramp.At the very bottom of the half-pipe, after gliding down.On his way back up the far side of the half-pipeHis kinetic energy would be the same everywhereThe difference between work and power is that:An object must move for work to be done, but not for power to be exerted  Work is always larger than power Time is not important to determine the work done, but it is for the power    exerted They are exactly the same thingWhat is FALSE about the binder(972 g) and the calculator(241 g) sitting on your desk? Both have the same amount of gravitational potential energy.Both have the same amount of kinetic energy.If they fall off the desk, both will hit the floor at the same speed.B and C are both FalseMelika used 686 N of force to hold her body in the bottom of a push-up position 25 cm above the ground, for 30 seconds. How much work did Melika do?5.7 J170 J17000 JNone5. Which unit below is NOT a possible unit for power?WNm/sJ/minN/s6.In which of the following cases is work NOT being done? A)holding a watermelon at chest heightB)pushing a bicycle 0.2 km [E]C)walking down a flight of stairsD)playing a guitar soloE)coasting to a stop on ice skates  7.Which of the following is NOT an expression for energy?A)B)C)D)E) 8.Two boys have the same mass and are riding on identical bicycles.  One boy has a speed of 8 m/s and the other a speed of 2 m/s.  What is the ratio of the first boy’s kinetic energy to the second boy’s kinetic energy? A)16:1B)8:1C)4:1D)2:1E)1:1 9. A force F acting on a stationary block on a smooth level surface moves the block a horizontal displacement d in a time t.  The power is A)C)zeroE)B)D)    he sum of an object’s gravitational potential energy and kinetic energy is called its A)conserved energyB)stored energyC)total mechanical energyD)thermal energy  11.Which of the following is equal to 1 joule (1 J)? A)1 N/kgB)1 N mC)1 N/sD)1 W/s 12.In which case is negative work being done? A)forward force is applied to a forward moving soccer ball to increase its speed in that direction.B)The work done by the Earth on a ball as the ball, initially at rest, falls 3.0 m down towards the Earth.C)The work done by the friction to slow a sled as it slides along the snow.D)A cart is moving at a constant velocity of 5.7 m/s [N] when a 0.5 N [downward] force is applied. 13. The energy “lost” pushing a box across a rough surface is transformed mostly intoA)frictionB)kinetic energyC)potential energyD)thermal energy 14.The speed of an object is doubled.  The kinetic energy isA)the sameB)half ()C)double ()D)quadruple () 15.Which of the following is NOT an expression for energy?A)B)C)D)E)A 6.0 kg object moving at 12.0 m/s at a height of 3.0 m above the ground has a kinetic energy ofA)432.0 JB)176.6 JC)608.6 JD)255.4 JE)72.0 J 17. A 1400 W motor uses 21 kJ of energy to give a car 16 kJ of kinetic energy.  The efficiency of the motor isA)24%B)31%C)76%D)131%E)69% 18. The engine of a truck moving at 11.0 m/s exerts 2100 N of force.  The power output of the engine isA)23.1 kWB)190.9 kWC)23.1 WD)231.0 WE)2111.0 W            Science Physics PHYSICS SPH3U Share QuestionEmailCopy link Comments (0)