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3 years ago

Write down the formula of expansion

Physics

1 answer:

lana [24]3 years ago

4 0

Answer:

well for me it's

Explanation:

L2-L1/L1(O2-O1)

O is the change in temperature

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An apple falls from a tree. Its position, at 0.3 second intervals, is shown below. At 0.0 seconds, the apple has not yet fallen,

Dmitry [639]

When ball is about to hit the ground, almost all its potential energy has already converted into kinetic energy. Thus at t=0.9 sec, it has least potential energy.

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3 years ago

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This graph is accurate because A) mechanical waves cannot travel through a medium. B) electromagnetic waves cannot travel throug

il63 [147K]

Answer:

IT would be C.electromagnetic waves move faster than mechanical waves.

Explanation:

4 0

2 years ago

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An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its l

Murrr4er [49]

Answer:

v = 25.45 m/s

Explanation:

In order to calculate the initial speed of the object, you take into account the formula for the maximum height reaches by the object. Such a formula is given by:

$h_{max}=\frac{v_o^2}{g}$ (1)

vo: initial speed of the object = 18 m/s

g: gravitational acceleration = 9.8 m/s²

Furthermore you use the following formula for the final speed of the object:

$v^2=v_o^2-2gh$ (2)

h: height

You know that the speed of the object is 18m/s when it reaches one fourth of the maximum height. You use this information, and you replace the equation (1) in to the equation (2), as follow:

$v^2=v_o^2-2g(\frac{h_{max}}{4})=v_o^2-\frac{1}{2}g(\frac{v_o^2}{g})\\\\v^2=v_o^2-\frac{1}{2}v_o^2=\frac{1}{2}v_o^2$

Then, you solve the previous result for vo:

$v_o=\sqrt{2}v=\sqrt{2}(18m/s)=25.45\frac{m}{s}$

The initial speed of the object was 25.45 m/s

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3 years ago

Can an object reverse its direction of travel while maintaining a constant acceleration?

lara31 [8.8K]

Yes, think of a negative acceleration and an initial positive speed, the object slows down until it stops, and then the speed becomes negative, so it reverses the direction!

7 0

2 years ago

What is centripental force?

agasfer [191]

Answer:

Centripetal force is the force that is necessary to keep an object moving in a curved path and that is directed inward towards the center of rotation.

Explanation:

Definition of centripetal force:

Centripetal force is the force that is necessary to keep an object moving in a curved path and that is directed inward towards the center of rotation.

Example of centripetal force

A string on the end of which a stone is whirled about exerts a centripetal force on the stone.

The diagram is shown below

Where

The centripetal forces acting towards the centre C that is $\vec {AC}$

and the direction is from A to C.

And the stone is moving in a circular motion with center as C.

7 0

2 years ago