Abaseball is traveling (+30 m/s) and is hit by a bat. it leaves the bat traveling (-40 m/s). what is the change in the velocity? remember that direction is what makes velocity different than speed.

Explanation:

Change in velocity can be calculated by subtracting initial velocity from final velocity. The expression for the same is as follows.

where,     = change in velocity

                = final velocity

                = initial velocity

It is given that initial velocity is +30 m/s and final velocity is -40 m/s. Thus, calculate the change in velocity as follows.

                        = -40 m/s - (+30 m/s)

                        = (-40 - 30) m/s

                        = -70 m/s

Therefore, the change in the velocity -70 m/s.

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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