Picking up a box, pushing a box along the ground, and pulling a box along the ground (B, C, and D) definitely involve work being done.
If a person CARRIES a box from one place to another, AND keeps it at the same height during the entire carry, then no work is done. ( A )
At the bottom of the thermometer and it slowly goes up as the temperature changes
Answer:
Linear mass density,
Explanation:
Given that,
Mass of the string, m = 0.3 g = 0.0003 kg
Length of the string, l = 1.5 m
The linear mass density of a string is defined as the mass of the string per unit length. Mathematically, it is given by :
or
So, the linear mass density of a string is 
. Hence, this is the required solution.
Lasers are important to help mankind in many different reasons. Some of these reasons include laser hair removal, some kinds of eye surgery, and lasers are said to help with the military in the near future. Laser hair removal is usually used for getting rid of unwanted hairs. And is just a easy alternative to regular waxing or doing it yourself. Some types of eye surgery require lasers to complete them successfully. This is usually very very precise as lasers get the job done at pin point accuracy. Besides medical uses the U.S. military have been testing laser weapons on battleships to attack or defend oncoming missiles. This will most likely replace small firing cannons or flares.
I hope this helped you.
Brainliest is always appreciated if you feel its deserved!
Answer:
Explanation:
The net work of the cycle is the sum of works in each process.
<u>For the first process 1-2: </u> Let's apply the work definition.
(1)
Now, we need the pressure. We know that pV=C, where C is a constant. Then ![p_{1}V_{1}=10^{5}2=2*10^{5} [J]](https://tex.z-dn.net/?f=p_%7B1%7DV_%7B1%7D%3D10%5E%7B5%7D2%3D2%2A10%5E%7B5%7D%20%5BJ%5D)
So 
Let's put p in (1):
Using the first law of thermodynamics we can find Q.
<u>Second process 2-3</u>
In this case, we have a constant volume, so the work done here is 0.
<u>Third process 3-1</u>
Finally, the net work is:
By the conservation of energy:
Because there is no change in total energy.
So:
It is a refrigerator because the net work is negative, it means it consumes energy.
I hope it helps you!
