What is the change in internal energy if 50 j of heat are released from a system, and the system does 80 j of work on its surroundings?

How does mass affect the speed of an object

What is a possible result of higher air temperature caused by global warming

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.