Tom has a mass of 73 . 9 kg and sally has a mass of 59 . 8 kg. tom and sally are standing 27 . 9 m apart on a massless dance floor. sally looks up and she sees tom. she feels an attraction. if the attraction is gravitation, find its mag- nitude. assume both can be replaced by spherical masses and that the gravitational constant is 6 . 67259 × 10 ^− 11 n · m^ 2 / kg^ 2 . answer in units of n.

representative si the final answer! : )

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: