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Y_Kistochka [10]

2 years ago

9

which of the following describes water changing from liqyid to solid, please give me a proof for this question please i really n

eed help

2 answers:

Fittoniya [83]2 years ago

4 0

The answers A, this is because Ice is originally water and when water goes below it's freezing point it turns into ice

navik [9.2K]2 years ago

3 0

The answer is a hope this helps

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A horizontal spring with spring constant 210 Nm is compressed by 20 cm and then used to launch a 250 g box across the floor. The

Damm [24]

Answer:

ugmd = 1/2 kx²

d = (1/2 kx²) / (ugm)

= (1/2 * 250 N/m * (0.2 m)²) / (0.23 * 9.81 m/s² * 0.3 kg)

= 7.4 m

ugmd = 1/2 mv²

v = √2ugd

= √(2(0.23)(9.81 m/s²)(7.4 m)

= 5.8 m/s

Explanation:

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3 years ago

On a snowy day, max (mass = 15 kg) pulls his little sister maya in a sled (combined mass = 20 kg) through the slippery snow. max

sesenic [268]

Work done by a given force is given by

$W = F.d$

here on sled two forces will do work

1. Applied force by Max

2. Frictional force due to ground

Now by force diagram of sled we can see the angle of force and displacement

work done by Max = $W_1 = Fdcos\theta$

$W_1 = 12*5cos15$

$W_1 = 57.96 J$

Now similarly work done by frictional force

$W_2 = Fdcos\theta$

$W_2 = 4*5cos180$

$W_2= -20 J$

Now total work done on sled

$W_{net}= W_1 + W2$

$W_{net} = 57.96 - 20 = 37.96 J$

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3 years ago

OLEGan [10]

Well you need to have lots of heat

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3 years ago

What is the amount of displacement of a runner who runs exactly 2 laps around a 400 meter track?

max2010maxim [7]

At the end of the laps, the runner's displacement is zero.

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2 years ago

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2 years ago