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3 years ago

10

What energy transformations occur when wood is burned?

1 answer:

son4ous [18]3 years ago

3 0

Answer:

chemical-heat-light

Explanation:

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A motorcycle accelerates from a stop at a rate of 4m/s 2 for 20 seconds. It then continues at a

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After 20 s, the motorcycle attains a speed of

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and it continues at this speed for the next 40 s. So at 45 s, its speed is 80 m/s.

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3 years ago

A child slides down the water slide at a swimming pool and enters the water at a final speed of 4.22 m/s. At what final speed wo

zheka24 [161]

Answer:

v'=5.97 m/s

Explanation:

If the friction and fluid friction are ignored, then by law of conservation of mechanical energy, potential energy at the top of the slide must be equal to the kinetic energy at the bottom of the slide. Thus, the height of slide and final speed at the bottom of the slide are related as:

$mgh = \frac {1}{2} mv^2\\v =\sqrt{2gh}$

let the final speed be v' when h' = 2 h

$\frac{v'}{v}=\frac{\sqrt h'}{\sqrt h}\\v'=\sqrt{\frac{2h}{h}}\times v\\v'=\sqrt2 v\\v'=5.97 m/s$

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3 years ago