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gtnhenbr [62]
3 years ago
12

A 40 kg boy on a skateboard throws a 2 kg ball at 20 m/s to the left. How fast did the boy move to the right on his skateboard?

Physics
1 answer:
sergey [27]3 years ago
4 0
According to my examination I have confirmed that I do NOT repeat do NOT know this .
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8. A spring of spring constant 4 N/m is stretched 0.5 meters. How strong is the restoring force?
pogonyaev

So, the recovery force of the spring is <u>2 N in the opposite direction of the pull</u>.

<h3>Introduction</h3>

Hi ! Here, I will help you about the spring recovery force. <u>The restoring force is the force that opposes the direction of the initial pull of the spring (either when the spring is pulled horizontally or vertically)</u>. The restoring force is strongly influenced by the type of spring (through the spring constant) and the length of the strain that occurs. Negative values in spring restoring force only indicate direction, not value. The equation that applies is as follows:

If the spring is pulled horizontally

\boxed{\sf{\bold{F = - k \times \Delta x}}}

With the following condition :

  • F = recovery force (N)
  • k = spring constant (N/m)
  • \sf{\Delta x} = horizontal length change (m)

If the spring is pulled vertically

\boxed{\sf{\bold{F = - k \times \Delta y}}}

With the following condition :

  • F = recovery force (N)
  • k = spring constant (N/m)
  • \sf{\Delta y} = vertical length change (m)

<h3>Problem Solving</h3>

We know that :

  • Assume the spring is pulled horizontally
  • k = spring constant = 4 N/m
  • \sf{\Delta x} = horizontal length change = 0.5 m

What was asked :

  • F = recovery force = ... N

Step by step :

\sf{F = - k \times \Delta x}

\sf{F = - 4 \times 0.5}

\boxed{\sf{F = -2 \: N}}

<h3>Conclusion :</h3>

So, the recovery force of the spring is 2 N in the opposite direction of the pull.

4 0
2 years ago
Question 3.Two forces are acting on a 30-kg object, 200 N up and 300 N
atroni [7]

Answer:

It is 3 m/s² downward.

Explanation:

The mass of an object, m = 30 kg

Upward force, F = 200 N

Downward force, F' = -300 N

We need to find the magnitude and direction of its acceleration.

Net force = F+F'

= 200+(-300)

= -100 N

We know that,

Force, F = ma, a is acceleration of the object

a=\dfrac{F}{m}\\\\a=\dfrac{-100}{30}\\\\a=-3.33\ m/s^2\approx -3\ m/s^2

Hence, the acceleration is -3 m/s² and it is acting in the downward direction.

4 0
3 years ago
Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. How far will the foot
Alisiya [41]
In the air for 1.2 seconds and travels 15.1 m
8 0
3 years ago
Read 2 more answers
What does the impulse-momentum theorem state? A. Impulse equals change in momentum B. Impulse and momentum change force. C. Impu
nasty-shy [4]

Impulse equals change in momentum.

8 0
3 years ago
The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme a
Tanzania [10]

Answer:

1) tensile stress = 76.648 Mpa

2) extension = 0.0215 m

Explanation:

Detailed explanation and calculation is shown in the image below

5 0
3 years ago
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