Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.

An illustration of a triangular trough traveling right and the same size and shape crest traveling left both toward point x. They are equidistant from x.
Will there be an instance in which the wave interference is at the same level as point X?

No, the interfering waves will always be above X.
No, the interfering waves will always fall below X.
Yes, the overlap will occur during the slope of the waves.
Yes, the overlap will occur when the first wave hits point X.

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:

answer: b.

explanation:

i need with 1.3.2 investigate cycling o2 and co2 apex

we need to see it