Dierdra began writing a summary of the relationship between the first and second laws of thermodynamics. Thermal energy in a system is conserved and can increase the system’s internal energy and/or be used to do work.

Which best completes Dierdra’s summary?

Thermal energy moves from cooler objects to warmer objects
Thermal energy moves from warmer objects to cooler objects.
Thermal energy is destroyed when it leaves the system.
Thermal energy is created when it enters the system.

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?