Please can some one explaine fore me What is work done
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It's (strength of a force) times (distance through which the force acts).
'Work' has the units of Energy.
If you push against a shopping cart with 30 newtons of force, and
you keep pushing while the cart moves 4 meters, then you have
done (30 x 4) = 120 newton-meters of work = 120 "Joules".
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Answer:
The ball will go over the net when she's standing 2 feet away from the net, but not at 4 ft from the net
Explanation:
Suppose then when the player is 2ft from the net, we can plug in x = 2:
As 8 feet > 7 ft 4 in, the ball will go over the net
If the player moves back so that she's 4 feet from the net, plug in x = 4:
As 7 ft < 7 ft 4 in, this time the ball will NOT go over the net
Final answer:
The function models the path of a volleyball when the player is 2 feet from the net and will the ball go over the net at different distances.
Explanation:
The function f(x) = -0.25(x-2)^2 + 8 models the path of a volleyball when the player is 2 feet from the net. To determine if the ball will go over the net, we need to compare the height of the ball's path with the height of the net.
First, let's convert the height of the net to feet. The height, 7 ft 4 in, is equivalent to 7.33 feet. Now, substitute x = 2 into the function to find the height of the ball when the player is 2 feet from the net. f(2) = -0.25(2-2)^2 + 8 = 8 ft.
The ball will go over the net because the height of the ball, 8 feet, is greater than the height of the net, 7.33 feet.
If the player moves back so she is 4 feet from the net, substitute x = 4 into the function: f(4) = -0.25(4-2)^2 + 8 = 10 ft. The ball would still go over the net, as the height of the ball, 10 feet, is greater than the net's height.
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Answer:
2.00 m/s. Brainliest appreciated, you’re welcome
a. Both waves are equally powerful.
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Answer
Correct answer is
wave A is more powerful than wave B
Explanation
Fetch of a wave is the length of water over which a wind blow. It is clear that the wave which has longer fetch will have higher energy level. And higher energy level wave will be more powerful that wave which has short fetch. hence wave A which has longer fetch than wave B will be more powerful that wave B.
Longer Fetch tend to create a higher energy level, which make the wave with longer fetch is stronger than the one with shorter fetch
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Answer:
P=2736 Pa
Explanation:
According to Newton we have that:
∑
A force is exerted by the elevator to the suitcase, according to 3th Newton's law an equal force but in the opposite direction will appeared on the suitcase, that is:
∑
We know that the pressure is given by:
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is used to calculate the work. The component of force that's perpendicular
to the displacement doesn't move through any distance at all, so its contribution
to the total work is zero.