Need
the first law of thermodynamics states that . is this also a statement of the principle of conservation of energy?
yes, the heat added and the change in internal energy of the gas equal the work done by the piston.
yes, the heat that flows into the system is used to change the internal energy of the gas and becomes work done by the piston.
no, the heat that is added to the system is only used to do work.
no, the change in internal energy is the energy lost in the system.

"i have always loved contemporary art and made it a general goal to work within the field. after a few nonprofit internships at museums and galleries, i decided to try the for-profit art world and was offered a job as the ad assistant at the magazine. i much prefer the pace of the for-profit art community and have stayed with the company for three years, with a promotion to an account manager last spring."

i just did this and got a 100.

heats surface water up

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.