22. a race car accelerates from 0.0 m/s to 5 m/s with a displacement of 2.5 m. what is the
car's acceleration? a. 5 m/s? b. 7.5 m/s2 c. 12.5 m/s2 d. 2.5 m/s2
5-6

Option A

Explanation:

From fundamental equation of motion

where v is the final velocity, u is the initial velocity, a is the acceleration of the body and s is the displacement.

Since the initial velocity is zero

Making acceleration, a the subject of the formula then

Substituting 5 m/s for v and 2.5 m for s then

good for her? ? where is the question?

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: