3 years ago

What do you know about volleyball

Physics

1 answer:

OverLord2011 [107]3 years ago

4 0

Answer:

its my favourite game...........

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A leftward force of 7N is applied to a box while the force of friction is 3N. The weight of the box is 4N as is the normal force

Flauer [41]

Answer:

Explanation:

When you draw a free body diagram, You have a 7N arrow pointing left, and a 3N arrow pointing right. When you subtract the two, you still have a force of 4N on the left. However, seeing as how gravity is in play at a force of 4N, the two forces cancel out and you get 0N.

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3 years ago

A string of mass m and length L is under tension T. The speed of a wave in the string is v. What will be the speed of a wave in

Gekata [30.6K]

Answer:

$\frac{1}{\sqrt{2}}$

Explanation:

The speed of a wave in a string is given by:

$v=\sqrt{\frac{T}{m/L}}$

where

T is the tension in the string

m is the mass of the string

L is the length

In this problem, the mass of the string is increased to 2m: m' = 2 m, while the length is not changed, L'=L. If the tension in the string is not changed, then the new speed of the wave in the string will be:

$v'=\sqrt{\frac{T}{m'/L'}}=\sqrt{\frac{T}{2m/L}}=\frac{1}{\sqrt{2}}\sqrt{\frac{T}{m/L}}=\frac{v}{\sqrt{2}}$