A flat, 179 179 ‑turn, current‑carrying loop is immersed in a uniform magnetic field. The area of the loop is 4.41 cm 2 4.41 cm2 and the angle between its magnetic dipole moment and the field is 59.9 ∘ . 59.9∘. Find the strength B B of the magnetic field that causes a torque of 2.25 × 10 − 5 N ⋅ m 2.25×10−5 N⋅m to act on the loop when a current of 2.49 mA 2.49 mA flows in it.

The atoms in a sidewalk on a hot summer day are vibrating the atoms in the sidewalk on a freezing day in winter. a. more rapidly than b. more slowly than c. at the same speed as

What are the factors that affect the resistance of a wire?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.