What couple is needed to hold a small single-turn coil of area 5 cm2 in equilibrium, when it carries a current of 10 a and is placed with its axis at right angles to a field of flux density 0.15 t. what couple would be required if the coil had 20 turns?

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?