Asmoke particle has a mass of 1.38*10^-17 kg and it is randomly moving about in thermal equilibirum with room temperature air at 27

The rms speed of the particle is 0.03 m/s.

Explanation:

Given that,

Mass of smoke particle

Temperature =27°C

Suppose we need to find the rms speed of the particle

We need to calculate the rms speed of the particle

Using formula of rms speed

Where, K = Boltzmann constant

T = temperature

m = mass

Put the value into the formula

Hence, The rms speed of the particle is 0.03 m/s.

a.) is the correct answer.

explanation:

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: