Nathan is standing 2 feet away from a plane mirror. Hiva is standing 5 feet further than Nathan in comparison to the mirror. The distance between Nachan and Hiva's image is:

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Which notation is used to represent an alpha particle? a. b. c. d.