You throw a rock straight up. Answer the following questions. (No calculations are necessary for this (a) What is the acceleration of the rock as it moves upward? (You need to give both magnitude and direction.)

(b) What is the velocity of the rock when it is at its maximum height?

(c) After reaching its maximum height, the rock starts moving downward. What is the acceleration of the rock as it moves downward? (You need to give both magnitude and direction.)

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: