1. Identify Which of the following is not a factor of global climate change: (5 points each) a. slight changes in Earth’s tilt

b. movement of continents

c. reversing of the magnetic poles

d. increase or decrease of solar energy

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

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

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?