(a) A dc power line for a light-rail system carries 1000 A at an angle of 30.0º to Earth’s 5.0×10−5T5.0×10−5T field. What is the force on a 100-m section of this line? (b) Discuss practical concerns this presents, if any.

Um vetor representa um deslocamento cujo módulo é 20 m. se v faz um ângulo de 60 graus com a horizontal, qual é o valor das componentes horizontal e vertical deste vetor?

Idon’t quite understand this problem

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.