You throw a frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the frisbee. ignoring air resistance, the torque exerted about its center of mass by gravity isa. 0.b. mgrc. 2mgrd. a function of the angular velocity. e. small at first, then increasing as the frisbee loses the torque given it by your hand.(answer should be a. but explain why)

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)