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Two positively charged skaters, Stacy and Bob, are traveling straight towards each other on frictionless ice. Consider them to be point charges. When they are 5.0 m apart, Stacy feels an attractive electric force of 2.2 N towards Bob. (a) What is the magnitude of the attractive force that Bob feels from Stacy? (b) The magnitude of Stacy's charge is twice as much as Bob's. What is the magnitude of Bob's charge? (c) Bob has twice the mass that Stacy does. At the instant that they are 5.0 m apart, from Bob's reference frame, Stacy appears to be moving towards him with an acceleration of 7.3×10-2 m/s2. Find Stacy's mass.
A rifle with a weight of 35 N fires a 5.5 g bullet with a speed of 200 m/s. If a 725 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
A uniform ladder 7.34m long weighing 410N rests with one end on the ground and the other end against a perfectly smooth vertical wall. What force does the wall exert on the ladder
A block of mass 0.6 kg is moving up a 40 degree inclined plane at a speed of 1.6 m/s. Assuming the surface is frictionless, how far up the plane will the block go before stopping
Each of the three helicopter rotor blades shown in the figure is 5.20 m long and has a mass of 286 kg. The rotor is rotating at 250 rev/min. What is the total kinetic energy of rotation
Two blocks are connected by a lightweight, flexible cord that passes over a single frictionless pulley. If m1 >> m2, find the acceleration and tension of each block
An aquarium contains a 5 - cm layer of water ( n = 1.333) floating on top of carbon tetrachloride ( n = 1.461) what is the angle of refraction into the air
A rapidly spinning paddle wheel raises the temperature of 200mL of water from 21 degrees Celsius to 25 degrees. How much a) work is done and b) heat is transferred in this process
A 10-cm-diameter parallel-plate capacitor has a 1.0 mmspacing. What is the magnetic field strength on the axis
A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. How fast are the waves traveling
A flat piece of glass covers the top of a vertical cylinder that is completely filled with water, What is the smallest value of the incident angle theta_a for which none of the ray refracts into the water
a student is reading a lecture written on a blackboard. the lenses in her eyes have a refractive power of 54.66
If one shines a laser with wavelength ? = 650 nm through a single slit of width a = 0.04 mm, How far apart are the minima
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