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Questions in physics

[Answered] If the potential energy and the kinetic energy are not the same, where did the leftover energy go?

[Answered] How much work does a mother do if she lifts each of her twin babies upward 1 meter? Each baby weighs 90 newtons.

[Answered] Which has more potential energy? A. A car parked on the top of the hill B. A person on the top of the same hill sitting down eating a sandwich C. A man running fast at the bottom of the same hill

[Answered] Your grandmother in Ireland sends you her favorite cookie recipe. Her instructions say to bake the cookies at 190.5°C. To what Fahrenheit temperature would you set the oven to bake the cookies?

[Answered] Calculate the average speed of a bicycle that travels 100 m in 20 s.

[Answered] A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

[Answered] After a large snowstorm, you shovel 2,500 kilograms of snow off of your sidewalk in half an hour. You lift the shovel to an average height of 1.5 meters while you are piling the snow in your yard. a. How much work did you do? (Hint: The force is the weight of the snow.) b. What was your power in watts? (Hint: You must always convert time to seconds when calculating power.)

[Answered] If a small machine does 2,500 joules of work on an object to move it a distance of 100 meters in 10 seconds: 1. What is the force needed to do the work? 2. What is the power of the machine doing the work?

[Answered] Green light has a lower frequency than blue light. Which color of light has a longer wavelength?

[Answered] In a bizarre but harmless accident, Superman fell from the top of the Eiffel Tower. How fast was Superman traveling when he hit the ground 7.80 seconds after falling?