The speed of a projectile when it reaches its maximum height is 0. 42 times its speed when it is at half its maximum height. What is the initial projection angle of the projectile?.

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.

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem