A2.0-kg cart and an 8.0-kg cart are connected by a relaxed, horizontal spring of spring constant 300 n/m. you pull the 8.0-kg cart with some constant horizontal force. the separation between the carts increases for a short time interval, then remains constant as you continue to pull and the spring is stretched by 0.100 m. part awhat pulling force did you exert? assume that the direction of your pull is the positive direction. express your answer to two significant figures and include the appropriate units. part bif you instead pull the 2.0-kg cart, what force must you exert to get the same stretch in the spring? assume that the direction of your pull is the positive direction. express your answer to two significant figures and include the appropriate units.

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 i think

i think it would be 5