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andrew-mc [135]
3 years ago
8

If you push against a stationary brick wall for several minutes, you do no work

Physics
1 answer:
bazaltina [42]3 years ago
5 0
B because in science work means moving an object over a distance
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if you drop a softball from just above your knee, the kinetic energy of the ball just before it hits the ground is about 1 jule,
ipn [44]
False.

The mass of a softball is approximately 200 g (0.2 kg), while the knees are located approximately at 30 cm (0.3 m) from the ground. It means that the gravitational potential energy of the ball when it is dropped is
U=mgh=(0.2 kg)(9.81 m/s^2)(0.3 m)=0.6 J

This corresponds to the total mechanical energy of the ball at the moment it is dropped, because there is no kinetic energy (the ball starts from rest). Then the ball is dropped, and just before it hits the ground, all this energy is converted into kinetic energy: but energy cannot be created, so its final kinetic energy cannot be greater than 0.6 J.
7 0
3 years ago
What is the effect on the gas’ pressure when compressing a gas to 1/3 of its volume? Explain
denis23 [38]

Explanation:

It's pressure become three times larger because according to Boyles Law the pressure of fixed mass of gas is inversely proportional to it's volume provided that temp remains constant. That means a reduction in volume, will result in an increase in pressure and vice versa.

4 0
3 years ago
SOMEONE PLEASE HELP ME ASAP PLEASE!!!!!​
Zina [86]

Answer:

x₁ = 58.09 m

Explanation:

Displacement is calculated by finding the final distance away from a point then subtracting the initial distance.

Given that initial position of object is x=25.89 m

Displacement Δx=32.2 m

Final position x₁=?

Δx = x₁-x

32.2= x₁-25.89

32.2+25.89 = x₁

58.09 m =x₁

5 0
3 years ago
Discribe what a conductor does
BabaBlast [244]
A conductor allows electricity to flow through it. 
5 0
3 years ago
Read 2 more answers
An elf pushes a sleigh with force of 9N over a distance of 11m. How much work did the elf. Do on the sleigh
Whitepunk [10]

Answer:

<h2>99 J</h2>

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 9 × 11

We have the final answer as

<h3>99 J</h3>

Hope this helps you

5 0
3 years ago
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