Equinox means equal
a. temperature in both hemispheres
b. times for sunrise and sunset
c. day and night hours
d. distance from the sun

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.