Physics, 13.10.2019 02:00 ayoismeisjjjjuan
When you rub a match against a rough surface, fire results, giving off light and heat. the law of conservation of energy says that energy cannot be created.
how can you explain the fire seeming to come from nowhere?
the energy was stored in chemical bonds before it became heat and light.
matches are made to take up energy from surfaces.
the energy started out as the sound energy of the rubbing match.
Answers: 2
Physics, 22.06.2019 01:10
Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.
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Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.
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Physics, 22.06.2019 18:00
Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.
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Physics, 22.06.2019 18:30
A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding?
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When you rub a match against a rough surface, fire results, giving off light and heat. the law of co...
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