An object is hung from a spring balance attached to the ceiling of an elevator cab. The balance reads 85 N when the elevator is standing still.

a) What is the reading when the elevator is moving upward with a constant speed of 7.9 m/s?

b) What is the reading when the elevator is moving upward with a speed of 7.9 m/s while decelerating at a rate of 1.1 m/s2?

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

Does current flow through or across a resistor?

You are the coordinator for a program that is going to take place at night in a rectangular amphitheater in the mountains. you will have no access to any electricity, but you must be able to illuminate the entire grounds. you know the intensity of the light from a lantern varies inversely as the square of the distance from the lantern. suppose the intensity is 90 when the distance is 5 m. a. write an equation to model the situation. b. solve for the constant of variation. c. write the equation to model the situation using the constant () of variation. d. you have been given lanterns with 40 light intensity. use your equation to solve for the distance from the lantern. e. you need to illuminate 225 km. how many meters do you need to light? f. how many lanterns will you need?