Aflat mirror is rotated 21 ∘ about an axis in the plane of the mirror. part a what is the angle change of a reflected light beam if the direction of the incident beam does not change?

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.