Aconducting bar of length , moves to the right on two frictionless rails. a uniform magnetic field directed into the page has a magnitude of 0.300 t. assume r = 9.00 ohm and , length (l) = 0.350 m. at what constant speed should the bar move to produce an 8.50- ma current in the resistor?

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Why should seat belts not be mandatory quick plz

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.