A ball with a mass of 2kg rolls on a flat surface. It starts rolling with an initial velocity of 2 m/s, and after a while, it’s velocity drops to 1.8 m/s. What is the final energy of the ball? A. 2 J
B. 4 J
C. 1.8 J
D. 3.24 J

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:

a displacement distance is size of displ

spare some change and give it to the poor

explanation:

plz : ((