A truck skids for a distance of 25 m with the road pushing on its tires with force of 1500 N as its brakes are applied.
What is the change in kinetic energy for the truck?
Round the answer to two significant digits.
J

-6800J

Explanation: 8.0m x 850N = 6800

Rewritten as a negative when brake/stop -6800

coil wire, increase current, put iron inside the coil

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: