21- 44 21-45 have electrons. These ions are separated by about 0.24 nm. Suppose

Question

21- 44

21-45

have electrons. These ions are separated by about 0.24 nm. Suppose a free electron is located 0.48 nm above the midpoint of the sodium chloride molecule. What are the magnitude and the direction of the electrostatic force the molecule exerts on it? Calculate the magnitude of the electrostatic force the two up quarks inside a proton exert on each other if they are separated by a distance of 0.900 fm. A -4.00-mu C charge lies 20.0 cm to the right of a 2.00-mu C charge on the x-axis. What is the force on the 2.00-mu C charge? Two initially uncharged identical metal spheres, 1 and 2, are connected by an insulating spring (unstretched length L0 = 1.00 m, spring constant k = 25.0 N/m), as shown in the figure. Charges +q and -q are then placed on the spheres, and the spring contracts to length L = 0.635 m. Recall that the force exerted by a spring is Fs = k Delta x, where Delta x is the change in the spring's length from its equilibrium length. Determine the charge q. If the spring is coated with metal to make it conducting, what is the new length of the spring?

Explanation / Answer

21-44

F = 8.98*10^9*-4*10^-6*2*10^-6/0.2^2 = -1.796N

21-45

25*0.375 = 8.98*10^9*q^2/0.635^2

q = 20.51uC

New length is 1m since total charge becomes 0

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