an arrow is aimed horizontally directly at the center of a target 20 m away. the arrow hits 0.050 m below the center of the target. neglecting air resistance what was the initial speed of the air?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

5400 j of energy are given off when a 50 g of aluminum pan changes temperature. does the temperature of the pan increase or decrease and by how much?

A10n falling encounters 10n of air resistance (upward force). the net force on the object is: