Mary is a 520 N actress who is playing a flying butterfly. She is attached to a pulley system that hoists her into the air. The stagehand pulls with 80 N of force.

A. What is the mechanical advantage of this pulley system?

B. If Mary was lifted 7 meters above the stage, how far does the stagehand have to pull the rope?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv.a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)