An object 4 cm high is placed 20 cm in front of a convex lens of focal length 12 cm. what is the position and height of the image? (can you show your work)

Argon is adiabatically compressed from an initial volume of 16 liters to a final volume of 2 liters. by what factor do the following quantities change? do they increase or decrease? (a) the rms speed (b) the thermal energy of the gas (c) the molar specific heat cv (d) the pressure

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

What is the increase in density of a medium due to wave travel?