1. A pendulum swings back and forth a total distance of 25 cm. In 15 s, it will complete a total of eight full swings.
a) Calculate its frequency.
b) Calculate its period.
c) State the type of vibration the pendulum produces.
d) Calculate its amplitude

STEPS PLEASE

Explanation:

a) Frequency is cycles per second.

f = 8 cycles / 15 s

f = 0.533 Hz

b) Period is the inverse of frequency.

T = 1/f

T = 1.88 s

c) A pendulum is an example of simple harmonic motion.

d) There are 4 amplitudes in one full swing.  So 8 full swings is 32 amplitudes.  The distance per amplitude is:

A = 25 cm / 32

A = 0.781 cm

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:

does anyone know or what?