How do astronomers best learn about distant objects in the universe a. they collect and analyze data from their electromagnetic radiation. b. they analyze rock samples from space probes. c. they study nearby objects and match their properties with those of distant objects.

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.