A 3.50-kg bucket of water is tied to a rope and lifted vertically upward at a constant speed of 1.87 m/s for a displacement of 28.4 m. Determine the work done upon the bucket.

Are aliens real? justify you’re answer.

Which atomic model was proposed as a result of j. j. thomson’s work?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.