An airplane of mass 12,000 kg flies level to the ground at an altitude of 10.0 km with a constant speed of 175 m/s relative to the earth.
(a). what is the magnitude of the airplane's angular momentum (in kg-m2/s) relative to a ground observer directly below the plane?
(b). does the angular momentum change as the airplane flies along its path?

Explanation:

mass of airplane, m = 12000 kg

altitude, h = 10 km = 10,000 m

velocity, v = 175 m/s

(a) Angular momentum

L = m x v x h x Sin 90

L = 12000 x 10,000 x 175

L = 2.1 x 10^10 kg m^2/s

(b) As there is no external torque, so the angular momentum remains constant.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

ice to water 1 water to vapour 2 latent heat