This happens at the boiling temperature of every substance that can vaporize<span>. At the </span>boiling temperature<span>, </span>adding heat energy converts the liquid into a gas WITHOUT RAISING THE TEMPERATURE<span>.The </span>same thing happens when a solid changes into liquid<span>. For </span>instance<span>, </span>ice and water can exist<span> together at the melting </span>temperature<span>.</span>
Answer:

Explanation:
Let assume that direction is positive when football travels to the player. The situation can be described properly by applying the definition of Momentum and Impulse Theorem. That is to say:

The average force needed to stop is obtained after some algebraic manipulations:

The impulse delivered to the ball is:


Answer:
In the given equation y=Asin(ωt−kx)
Since, trigonometric function is a dimensionless quantity. So, (ωt−kx)is also dimensionless quantity.
So,
(ωt−kx)=1
ωt=1
[ω]= <u>1</u>=[T] ^−1
[T]
kx=1
[k]= <u>1</u>=[L]^ −1
[L]