What are 5 examples of expansion and contraction? What are their benefits?

Physics

1 answer:

liubo4ka [24]2 years ago

6 0

Answer:

If you hold a hot glass tumbler under cold water, it will crack

Explanation:

This is because the outer surface of the glass comes in direct contact with cold water and contracts more compared to the inner surface.

This is one example I know.

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2. An archer shoots an arrow at 83.0 m/s at a 62.0 degree angle. If the ground is flat, how much time is the arrow in the air?

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Explanation:

<u>Diagonal Launch </u>

It's a physical event that happens where an object is thrown in free air (no friction) forming an angle with the horizontal reference. The object then describes a path called a parabola.

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$\displaystyle y=y_o+v_osin\theta \ t-\frac{gt^2}{2}$

Where vo is the initial speed, $\theta$ is the angle, t is the time and g is the acceleration of gravity .

In this problem we'll assume the arrow was launched from the ground level (won't consider the archer's height). Thus $y_o=0$ , and:

$\displaystyle y=v_osin\theta \ t-\frac{gt^2}{2}$

The value of y is zero twice: when t=0 (at launching time) and in t= $t_f$ when it goes back to the ground. We need to find that time $t_f$ by making $y=0$