Using the set-up seen here, ms. garcia places a golf ball between the globe and the flashlight. turning off the lights in the room, she shines a flashlight from behind the golf ball. the students observe the shadow of the golf ball falling on the globe. what is this setup trying to model?
a) a solar eclipse
b) the solar system
c) the idea of gravity
d) the surface of the moon

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

How do we measure or think of speed in the united states?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.