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ziro4ka [17]
4 years ago
8

How does hitting a ball with a tennis racquet involve action and reaction forces?

Physics
1 answer:
iragen [17]4 years ago
5 0

Answer:

In a tennis match, the racket exerts the action force on the ball and, as the ball hits it, it exerts an equal and opposite reaction force on the racket. The rocket launches because it pushes on the gas coming out the back end for the action force, while the gas pushes the rocket upward with a reaction force.

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A force of 20 N acts on a 4 kg cart for 10 s . How far will it go (using the second law) ?
Elden [556K]
This took me a short while to figure out, but I am still not entirely sure if this is correct, this is just from my basic understanding of Newtons Second Law of Motion.

You have a 4kg cart with a force of 20N acting on it.

The formula for working out the acceleration is.
a=Fnet÷mass

Substitute in the information.
a=20N÷4kg

Now you solve it to give you.
a=5m/s

So now what you should be able to do is figure out that after 10 seconds the cart travelling at 5m/s would have travelled 10 metres.

This is achieved by finding out how many 5's go into 10 which is 2.
So you do 5×2 which equals 10.

The 4kg cart has travelled 10 meters in 10 seconds with a force of 20N acting upon it.

I hope that this has helped you.
8 0
3 years ago
An early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through one of the
Readme [11.4K]

Answer:

4.7 x 10³ rad / s

Explanation:

During the time light goes and comes back , one slot is replaced by next slot while rotating  before the light source

Time taken by light to travel a distance of 2 x 500 m is

= (2 x 500) / 3 x 10⁸

= 3.333 x 10⁻⁶ s .

In this time period, two consecutive slots come before the source of light one after another by rotation. There are 400 slots so time taken to make one rotation

= 3.333 x 10⁻⁶ x 400

= 13.33 x 10⁻⁴ s

This is the time period so

T = 13.33 X 10⁻⁴

Angular speed

= 2π / T

= \frac{2\times3.14}{13.33\times10^{-4}}

4.7 x 10³ rad / s

5 0
3 years ago
What is the continuous flow of electric charge?
Burka [1]
A flow of electric charge from one place to another is electric 'current'.

Also: 
When you post a multiple-choice question,
please post the choices along with it. 
Thank you.
7 0
4 years ago
Does calm water have a regular reflection or a diffuse reflection
Shtirlitz [24]
A regular relflection
8 0
3 years ago
Read 2 more answers
To be topologically equivalent which deformation is not allowed
Jobisdone [24]
I just took this quiz and the answer is tearing. If you want to be topologically equivalent, tearing is not allowed. Hope this helps someone!
3 0
4 years ago
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