Chapter 44, Problem 21P

3). When a capacitor has a charge of magnitude 80 μC on each plate the potential difference across the plates is 16 V. How much energy is stored in this capacitor when the potential difference across its plates is 42 V? a. 1.0 mJ b. 4.4 mJ c. 3.2 mJ d. 1.4 mJ e. 1.7 mJ

5). A conductor of radius r, length & and resistivity p has resistance R. It is melted down and formed into a new conductor, also cylindrical, with one fourth the length of the original conductor. The resistance of the new conductor is a. 1 R 161 b. 1 R C. R d. 4R e. 16R

8). Determine the magnitude and sense (direction) of the current in the 10-Q2 resistor when I = 1.8 A. 30 V L 50 V 10 Ω 20 Ω a. 1.6 A right to left b. 1.6 A left to right C. 1.2 A right to left d. 1.2 A left to right e. 1.8 A left to right R PG

7). Determine the current in the 10-V emf. 5.0 0 w 10 V 5.0 0 15 V 5.0 Ω a. 2.3 A b. 2.7 A c. 1.3 A d. 0.30 A e. 2.5 A

4). What is the resistance of a wire made of a material with a resistivity of 3.2 is 2.5 m and its diameter is 0.50 mm? a. 0.16 Ω b. 0.10 2 C. c. 1.28 Ω d. 0.41 2 e. 0.81 2 108 m if its length

A flat circular coil with 135 turns, a radius of 2.28 x 10-2 m, and a resistance of 0.618 is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of AB/At = 0.615 T/s, thereby inducing a current in the coil. Find the magnitude of the magnetic field at the center of the coil that is produced by the induced current. Number

please solve the question attached

Sketch a sine wave depicting 3 seconds of wave activity for a 5 Hz tone. Sketch the resulting complex wave form that results from the combination of the following two waves. Is this wave periodic or aperiodic? USE GRAPH PAPER!

Required information A bungee jumper leaps from a bridge and undergoes a series of oscillations. Assume g = 9.78 m/s². If a 60.0-kg jumper uses a bungee cord that has an unstretched length of 30.1 m and she jumps from a height of 45.2 m above a river, coming to rest just a few centimeters above the water surface on the first downward descent, what is the period of the oscillations? Assume the bungee cord follows Hooke's law.