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3 years ago

How does the work needed to lift an object and the gravitational potential energy of an object compare

1 answer:

8 0

When you do work to lift the object, the amount of work you do BECOMES the object's gravitational potential energy. It GETS its potential energy from the work you do to lift it. They're equal. You lose it, and the object gains it. Energy is not created or destroyed. It's just transferred from you to the object.

Later, when you DROP the object, GRAVITY does the same amount of work on it, to pull it to the ground. Again, no energy is created or destroyed. Every time a force acts to move anything, the energy to do it comes from somewhere, and the energy goes somewhere.

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is friction always a bad thing? can u think of some situations of tools that take advantage of frictional force??

abruzzese [7]

Answer:

Explanation:

walking requires friction because if friction did not exist we would slide around without stopping

5 0

3 years ago

A velocity vs. time graph is shown.

Scilla [17]

Answer:

Acceleration, $a=4\ m/s^2$

Explanation:

We are given with a velocity-time graph of an object that starts from origin. y axis is velocity and x-axis is time.

The slope of velocity-time graph gives acceleration of an object. Taking the slope of this graph.

$m=\dfrac{v}{t}\\\\m=\dfrac{20\ m/s}{5 s}\\\\m=\text{acceleration}=4\ m/s^2$

So, the acceleration of the object is $4\ m/s^2$ .

8 0

4 years ago

If the height is 10m, what is the potential energy? Asuming that the mass is 10

Ratling [72]

$\huge{\textit{\sf{{\color{m}{Answer}}{\color{b}{࿐}}}}}$

we know,

$\boxed{potential \: energy = mgh}$

So,

$\longmapsto10 \times 9.8 \times 10$

$\longmapsto980 \: joules$

6 0

3 years ago

1 point

bearhunter [10]

Answer:

0 is your answereeeeerrrrr

5 0

3 years ago

Figure 15-1 shows how a(n) ____________________ breeze works.

Firlakuza [10]

<h2>Right answer: Sea breeze </h2>

The sea breeze is formed because during the day the surface of the land on the coast tends to warm up before and more than the surface of the sea. This difference in temperature between these two air masses means that on a sunny day the land warms up much more than the ocean causing a small area of low pressure.

Then, the air rises as the land warms it and the colder air located on the surface of the sea forms a high pressure zone that makes this air mass tend to occupy the space left by the warmer air that has ascended on the coast. Therefore, the mass of air of a high pressure on the ocean always tends to move towards the zone of low pressure located on the coast.

It is important to note that the <u>sea breeze blows perpendicularly to the coast</u> and that the best breezes are formed in the spring and summer seasons because during the spring the water temperature is still cold and during the summer the sun produces high temperatures over the land in the coast.

<h2>So, <u>the greater the temperature contrast </u>between the land and the sea, <u>the greater the force of the wind generated</u>.</h2>

8 0

4 years ago