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3 years ago

13

At what temperature will water change from a liquid to a solid?

1 answer:

Aleksandr-060686 [28]3 years ago

8 0

There is a special temperature for every substance called the melting point. When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt.

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Nellie pulls on a 10kg wagon with a constant horizontal force of 30N. If there are no other horizontal gorces what is the wagons

kicyunya [14]

Answer:

$a=3m/s^2$

Explanation:

If we have a net force F acting on a body of mass m it will experiment an acceleration a. Newton's 2nd Law gives us the relation between these quantities: F=ma.

In our case, we want to calculate the acceleration, so we write:

$a=\frac{F}{m}$

With the values we have we get:

$a=\frac{30N}{10Kg}=3m/s^2$

3 0

3 years ago

A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. The plane flies 110 m above the

zysi [14]

Answer:

The distance is 709.5 m.

Explanation:

Given that,

Speed = 150 m/s

Distance = 110 m

Suppose, How far short of the target should it drop the package?

We need to calculate the time

Using equation of motion

$s=ut+\dfrac{1}{2}gt^2$

$t^2=\dfrac{2s}{g}$

Where, g = acceleration due to gravity

t = time

Put the value into the formula

$t=\sqrt{\dfrac{2\times110}{9.8}}$

$t=4.73\ sec$

We need to calculate the distance

Using formula of distance

$d= vt$

Put the value into the formula

$d=150\times4.73$

$d=709.5\ m$

Hence, The distance is 709.5 m.

8 0

3 years ago

Which answer accurately describes the difference between speed and velocity? Question 8 options:

Snowcat [4.5K]

A., Because speed is constant unless you stop it, or slow down <span />

7 0

4 years ago

Read 2 more answers

A stone is thrown in a vertically

Lemur [1.5K]

Answer:

1.25 m

0.5 s

Explanation:

Given:

v₀ = 5 m/s

v = 0 m/s

a = -10 m/s²

Find: Δy

v² = v₀² + 2aΔy

(0 m/s)² = (5 m/s)² + 2 (-10 m/s²) Δy

Δy = 1.25 m

Find: t

v = at + v₀

(0 m/s) = (-10 m/s²) t + (5 m/s)

t = 0.5 s

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4 years ago

The number of ______ always differs in atoms of different elements

zhenek [66]

The number of protons always differs in atoms of different elements.

8 0

3 years ago