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When can a 1000kg car and a 2000kg truck have the same momentum?
When the car travels twice as fast as the truck.
Does a moving object posses impulse?
Does a moving object posses momentum?
If a boxer makes the time of contact three times longer you riding with the punch, by how much is the force reduced?
One-third as great as it would be have been if he hadn't pulled back.
If the boxer instead moves into the punch and shortens the contact time by half, by how much is the force increased?
The force will be two times greater than it would have been if he had held his head still.
A boxer being hit with a punch tries to extend the time of contact for best results, whereas a karate expert delivers a blow in a short time for best results. Is there a contradiction here?
There is no contradiction, because the best results for each are different.
Why do cells need energy?
Cells need energy to do all those things that require work.
What is the ultimate force that powers most life on earth? Explain.
The sun; it is the source of the energy plants need to perform photosynthesis. Plants form the base of most of food chains, and so the energy they obtain from the sun is transferred to other organisms that consume them.
What is the principle energy source used by most living things?
How do plants obtain glucose? How do animals obtain it?
Plants obtain glucose through photosynthesis. Animals obtain it by breaking down nutrients in the foods they eat, such as priteins, carbohydrates, and fats.
When the brakes of a car are locked, the car skids to a stop. How much farther will the car skid if it's moving three times as fast?
Nine times farther.
Can an object posses energy?
Yes, but only in a relative sense.
Can an object posses work?
No; unlike energy, work is not something an object has.
Rows of wind powered generators are used in various windy locations to generate electric power. Does the power generated affect the speed of the wind? Would locations behind the windmills be windier if they weren't there?
Windmills generate power by taking kinetic energy from the wind, so the wind is slowed by interaction with the windmill blades. So, yes, it sould be windier behind the windmills if they weren't there.
If a lever is arranged so that input distance is twice output distance, can we predict that energy output will be doubled?
No, we can predict output force will be doubled, but never output energy.
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