Aloop of radius r = 3.0 cm is placed parallel to the xy-plane in a uniform magnetic field = 0.75 t . the resistance of the loop is 18 ω. starting at t = 0, the magnitude of the field decreases uniformly to zero in 0.15 seconds. what is the magnitude of the electric current produced in the loop during that time?
a) 0.79 ma
b) 3.9 ma
c) 1.7 ma
d) 2.1 ma
e) 0.20 ma

If 1 lb of fat is stored by the body for each 14.6×103kj of excess nutritional energy consumed, how long will it take this person to gain 1 lb?

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

A4.0-cm tall light bulb is placed a distance of 32.0 cm from a concave mirror having a focal length of 16.0 cm. determine the image distance