A graph showing the kinetic energy and speed of a moving object is provided. KE (Joules)
Speed (m/s)
Which of the following can be concluded from the graph?
Kinetic energy only changes when speed changes.
Speed is only related to the size of an object.
Kinetic energy increases as speed increases.
All moving objects have the same kinetic energy.

its the 3rd one kinetic energy increases as speed increases

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:

the answer is b

explanation: