50 points do this in your own words do not copy from somewhere else!

in a heat engine, if 1000j if heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the initial energy was 2000j?

1. write the equation.
2. list out the know variables.
3. plug in the numbers into the equation.
4. solve.
5. write your solution statement that includes initial energy and final energy.

2500 J

Explanation:

Let's solve the problem using the first law of thermodynamics, which states that

U_f - U_i = Q-W

where

Uf is the final internal energy

Ui is the initial internal energy

Q is the heat absorbed by the system

W is the work done by the system

In this problem, we have:

Ui = 2000 J is the initial internal energy

Q = 1000 J is the heat absorbed by the system

W = 500 J is the work done by the piston

If we substitute numbers into the equation, we find:

U_f =U_i + Q-W=2000 J+1000 J-500 J=2500 J

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.