A swimming pool is an example of an open system. According to the law of conservation of energy, if swimmers add 1,500 J of thermal energy to the
pool and the surrounding air adds 2,500 J of thermal energy, what is the total
change in energy?

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !