Atrain consists of a caboose (mass = 1000 kg), a car (mass 2000 kg), and an engine car (mass 2000 kg). if the train has an acceleration of 5 m/s2, then the tension force in the coupling between the middle car and the engine car is

25,000 n
20,000 n
15,000 n
10,000 n

What must be the same for any two resistors that are connected in series ? a. the potntial diffrence across each b. the rate at which charge moves through each c. the rate at which energy is used by each d. the resistance to the flow of charge of each

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

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.