4 years ago

How many significant figures does the value 0.080 have? 1 2 3 4

Physics

1 answer:

lara [203]4 years ago

3 0

2. The zeros in front do not matter

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julsineya [31]

The net force is (40 Newtons) (down the road).

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3 years ago

A truck, initially at rest, rolls down a frictionless hill and attains a speed of 20 m/s at the bottom. To achieve a speed of 40

Crank

Answer:

To achieve the velocity of 40 m/sec height will become 4 times

Explanation:

We have given initially truck is at rest and attains a speed of 20 m/sec

Let the mass of the truck is m

At the top of the hill potential energy is mgh and kinetic energy is $\frac{1}{2}mv^2$

So total energy at the top of the hill $=mgh+0=mgh$

At the bottom of the hill kinetic energy is equal to $\frac{1}{2}mv^2$ and potential energy will be 0

So total energy at the bottom of the hill is equal to $0+\frac{1}{2}mv^2$

Form energy conservation $mgh=\frac{1}{2}mv^2$

$v=\sqrt{2gh}$ , for v = 20 m/sec

$20=\sqrt{2\times 9.8\times h}$

Squaring both side

$19.6h=400$

h = 20.408 m

Now if velocity is 0 m/sec

$40=\sqrt{2gh}$

$19.6h=1600$

h = 81.63 m

So we can see that to achieve the velocity of 40 m/sec height will become 4 times

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3 years ago

Please I need an answer

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B or c
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what distance is a book from the floor if the book contains 196 joules f potential energy and has a mass of 5 kg?

AleksAgata [21]

E=mgh. 196=5kg*9.81m/s^2*h. So h=196/(5*9.81)=4m

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4 years ago

Based on Newton’s First Law, what would you expect to happen to a block that is pushed across ice and begins moving (You may ass

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3 years ago

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