A particle (charge 7.5 mC) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-mC charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?
a. 3.0 J
b. 1.8 J
c. 2.4 J
d. 1.2 J
e. 1.4 J
D
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A wave is described by the function y(x,t) = (3.00 cm)cos[( 3.00 m-1)x + ( 4.00 s-1)t]. What is the wavelength of this wave?
A) 2.09 m B) 3.00 m C) 0.333 m D) 0.250 m E) 1.57 m
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in series across the same 120-volt source, the current drawn from the source remains at 6 amperes
a. True b. False Indicate whether the statement is true or false
A double-slit experiment is performed and then redone using slits of double the previous separation. Nothing else is changed. If the approximation sin 
holds, what happens to the angle between the maxima?
A. it stays the same B. it doubles C. it quadruples D. it halves E. it quarters
Why is stratification sometimes dangerous to the fish that live in a lake?
What will be an ideal response?