Physics Answers

3. The electric (E) and magnetic (H) field vectors in a medium are given by

𝑬 = 𝒊^ 20𝑐𝑜𝑠(𝜔𝑡 + 𝜋𝑦)𝑉/𝑚 , 𝑯 = 𝒌^ 20 𝑐𝑜𝑠(𝜔𝑡 + 𝜋𝑦)𝐴/𝑚

𝜂

Use Maxwell’s equations to determine η and ω. Assuming that for the medium 𝜀 = 36𝜀𝑜 ,

𝜇 = 𝜇𝑜 .

Two balls A and B, weighing 49 N each, approach each other, with speeds of 20 m/s and 30 m/s respectively. Determine their speeds after the collision if (a) the coefficient of restitution is 0.80, and (b) they are completely inelastic. 

Three resistors with values of 60.0Ω, 30.0 Ω, and 20.0 Ω, respectively, are

connected in series to a 110.0 V battery of negligible internal resistance. (a) Draw a circuit diagram and find the (b) equivalent resistance of the combined resistors, (c) current flowing through each resistor, (d) voltage drop across each resistor.

A certain resistance thermometer reads 14.5 Ω in pure melting ice and 18.5 Ω in steam at standard atmospheric pressure. What will be its resistance at room temperature of 27.0oC?

A body of mass 0.6kg is thrown vertically upward from ground with a speed of 20ms-1. Calculate its potential energy at the maximum height

a mechanical oscilator has initial energy Enot= 50j having a damping coefficient b=1s. Calculate the time required to decrease to E= Enot/e

In a geology class, you were asked to determine minuscule pieces of rocks are magnetic or not. The problem is you don't have available magnets in the laboratory but a few copper wires and a power supply. How will you identify the magnetic property of rocks?

Two point charges are placed as follows: charge q_{1} = - 1.50nC is at y = 6.00 m and charge q_{2} = 3.20nC is at the origin. What is the total force (magnitude and direction) exerted by these two charges on a negative point charge q_{3} = - 5.00nC located at (2.00 m, -4.00 m)?

Water flows through a venturi meter which contracts from D = 300 mm to

d = 150 mm at the rate of 0.0037 m3

/s and the differential gauge has a

deflection, h of 1 m, as shown in the figure below. Specific gravity of the

gauge liquid is 1.25. Determine the coefficient of discharge of the meter.

Two capacitors with 2.0 F and 3.0 F capacitance, respectively, are connected in series and subjected to a total potential difference of 100 V. Find the (a) total capacitance,

(b) charge stored in each capacitor, and (c) potential difference across each capacitor