if a 0.49kg squirrel jumps from a tree branch that is 3.6m high to the top of a bird feeder that is 1.5m high. what is the change in gravitational potential energy of the squirrel? (the acceleration due to gravity is 9.8m/s^2)

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

The heliocentric and the geocentric models of the solar system included these central principles

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?