From earth to the center of our galaxy is about 300,000 light years, meaning that light coming from a star in the center of our galaxy takes 300,000 years to get to earth.

true or false

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.