1. Name 2/6 things you can learn about a star by looking at its light in a telescope. 2. An infrared pictures that uses different colors to show variations in temperature in called a
3. If you know the wavelength of the color emitted by a dense object you know it's
4. Name the colors of the visible light spectrum in order from highest energy to lowest energy.​

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

What are similarities and differences between refraction, reflection, diffraction and absorption?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.