Let ρal represent the density of aluminum and ρfe that of iron. find the radius of a solid aluminum sphere that balances a solid iron sphere of radius rfe on an equal-arm balance. (use r_f for r fe, rho_a for ρal, and rho_f for ρ as necessary.)

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.