Electric Circuits Answers

1. Assuming that an oscilloscope displays a V_max of 5.22V and V_min of 1.33V. Calculate the percentage of modulation. (5 points)
2. Three (3) AM broadcast stations are spaced at 18 kHz, beginning at 73 kHz. Each station is allowed to transmit modulating up to 6 kHz. Compute for the upper and lower sidebands of each station and plot it in the frequency domain. (15 points)
3. Given a V_max of 7.45V and a modulation index of 0.691, calculate for V_min. (5 points)
4. A station is given a carrier frequency of 88 kHz. Having a modulating frequency of 12 kHz, compute for the upper and lower sidebands of the station. (5 point

Assume Young's modulus for bone is 1.5 x 10¹⁰N/m². The bone breaks if stress greater than 1.5 x 10⁸ N/m² is imposed on it. 1) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.5 cm? 2) If this much force is applied compressively, by how much does the 25 cm long bone shorten?

One property Q of a material is used to describe the behaviour of sound waves in the material.Q is defined as the pressure P of the sound wave divided by the speed v of the wave and the surface area A of the material through which the wave travels:

Q=P/vA

Two resistors of 4Ω & 6Ω are connected in series and then to a 12v source. How much is the total

current drawn by the circuit?

  A stone is released from rest at a height of 122.5 m. a) What is its velocity after 2 seconds? b) How many seconds will it take for the stone to reach the ground, and c) With what velocity will it hit the ground?

A ball is thrown vertically upward and returns to its starting point 20 seconds later. Find its a) initial velocity; b) the maximum height it has reached.

A charged pith ball of mass 0.12 kg is suspended between parallel plates. The negative plate is on the bottom, and the plates are 0.5m apart. The pith ball is located halfway between the plates. Find a) the strength and direction of the electric field, b) the sign of the charge on the pith ball, c) the potential at the location of the pith ball, and d) what would happen if the pith ball were moved to a point 0.15 m above the negative plate. Show your work and explain your reasoning.