3 years ago

References

Physics

1 answer:

never [62]3 years ago

4 0

a b c d

A V=V+gt

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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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frutty [35]

Hope this helps! If in need of clarification, feel free to ask :)

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4 years ago

Equation of uniformly accelerated motion

Romashka [77]

This means acceleration a is constant.

Let

a) vo be the initial speed, at t=0

b) v be the final speed after time t

c) d distance travelled in time t

Then we have:

a) v=vo+a×t

b) v²=vo²+2×a×d (Galilei's equation)

c) d=vo×t+a×t²/2

d) average speed vm=(vo+v)/2

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4 years ago

A car and a heavy truck roll down a hill and reach the bottom at the same speed. Compared with the momentum of the truck, the mo

RoseWind [281]

Answer:

A. less

Explanation:

The momentum of an object is directly proportional to it mass and velocity. It is the product of mass and velocity of the object. Given as

$Momentum (p) = Mass (m) \times Velocity (v)$

So the momentum of car,

$p_{c} = m_{c}\times v_{c}$

Momentum of truck,

$p_{t} = m_{t}\times v_{t}$

We know that, mass of car is less than that of truck and velocity of the two are same. It is implied that, momentum of car will be less than that of truck.

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4 years ago