It is required to lift the engine piston of a 200kg mass boat vertically using two concurrent cables at one point on the piston. One of the cables makes an angle of 30 ° with the vertical. a) Find the direction of the second wire so that the tension is minimal. b) Find the value of the stress. Se requiere izar verticalmete el pistón del motor de un barco de 200kg de masa utilizando dos cables concurrentes en un punto sobre el pistón. Uno de los cables forma un ángulo de 30° con la vertical. a) Halle la dirección del segundo cable de modo que la tensión sea mínima. b) Halle el valor de la tensión.

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:

i think the answer is a and b

i wish you luck