Which factors are involved in earthquakes formation (multiple choice) a. rocks breaking b, stress decreases c, faults that remain stationary d, movement below surface which statement describes the mercalli scale? this scale produces a single rating for earthquakes that reach the surface or this scale measures magnitude of an earthquake based on their size?

1- Option (A) and (D)

2- Mercalli scale measures earthquake magnitude depending on its size

Explanation:

Earthquake occurs due to the sudden shaking of the earth. During an earthquake, seismic waves are produced, namely P wave and S wave, and this waves propagates through the interior of the earth depending upon its magnitude and intensity, thus travelling below the earth's surface.

Due to this wave propagation the rocks breaks and adjust themselves and the faulting occurs along the weak zones.

According to the Mercalli scale, the earthquake is measured in terms of intensity of the shaking of the ground and the size. If a small area is affected then its magnitude is less but if an earthquake affects a large area then it is a severe one.

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: