People have proposed driving motors with the earth's magnetic field. this is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques. suppose a 16-cm-diameter loop of wire is oriented for maximum torque in the earth's field.

what current would it need to carry in order to experience a very modest 1.0�10? 3n? m torque?

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Two horses begin at rest. after a few seconds, horse a is traveling with a velocity of 10 m/s west, while horse b is traveling with a velocity of 13 m/s west. which horse had a greater acceleration? a. horse a because its change in velocity was greater than horse b's in the same time. b. horse b because its change in velocity was greater than horse a's in the same time. c. horse b because its change in velocity was the same as horse a's, but it took less time. d. both horses had the same acceleration.

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?