(01.02 LC) Which of the following is a contact force? Select one: a. Electrical force .

b. Frictional force

c. Gravitational force

d. Magnetic force​

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Ineed ! i have no clue how to do this problem.

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added