2. Una masa pendular está unida en el extremo de una cuerda de 30cm de longitud, cuyo otro extremo es un punto fijo, la masa pendular describe una circunferencia horizontal de radio AB. Cuál es la rapidez de la masa pendular, si la cuerda forma un ángulo de 30 grados con la vertical?.​

k váñàķò

Explanation:

ķèì bùìjàķò xàìñà

Ŕàmŕàì ĺàķhà

Àñšwèŕ ìś śhòŕþ

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: