As a review for newton's laws, my teacher has assigned my class to do an egg drop test. does anyone have any tips on what to use? so far, my group has sponges, marshmallows, air in a bag. also for the parachute, would cellophane or plastic work better?

use the sponges on the bottom marshmallows on the sides and cellophane works best

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 correct choice is a .

do not post any more test or exam questions on