Wes stands on the roof of a building, leans over the edge, and drops a rock. lindsay waits 1.20 s after wes releases his rock and throws her own rock straight down at 21.0 m/s. both rocks hit the ground simultaneously. 1) calculate the common height from which the rocks were released. ignore the effects of air resistance. (express your answer to three significant figures.)

11.875 m

Explanation:

Given

initial  speed of wes ball()=0 m/s

initial  speed of Lindsay ball()=21 m/s

let Height of building be h m

Consider vertical motion

here initial vertical velocity is zero and wes drop 1.2 s earlier than Lindsay

For Lindsay

Equating (1) & (2) we get

42t=1.44g+2.4t

39.6t=1.44g

Putting this value in (1)

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:

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