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southerntouch103
26.10.2020 •
Physics
A motorcycle of mass m starting from resst can attain a speed v after work w is performed by its engine. If the engine could perform work 4w then the final speed would be?
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Ответ:
v' = 2 v
Explanation:
The work performed by the engine is equal to the change in the kinetic energy of the motorcycle.
w = ΔK = K₂ - K₁ = 1/2 × m × v₂² - 1/2 × m × v₁²
Since v₁ = 0 (rest), the work is equal to the final kinetic energy of the motorcycle. We will express this as:
w = 1/2 × m × v² [1]
If the engine performed a new work w' = 4w, we get:
w' = 1/2 × m × v'²
4w = 1/2 × m × v'²
w = 1/8 × m × v'² [2]
Since [1] = [2]
1/2 × m × v² = 1/8 × m × v'²
4 v² = v'²
v' = 2 v
Ответ:
Characteristic Property
Explanation:
A property of matter that is always the same, no matter what size the sample. These are used to help identify substances. Examples are density, solubiility, flammability, reactivity