Physics Answers

A 2.0 microF capacitor is charged by a 12V battery. It is disconnected from the battery and connected to an uncharged 5.0 microF capacitor. Determine the total stored energy:

i. before the two capacitors are connected

ii. after they are connected

The number density of copper atoms is 8.49 10^28 atoms m^-3 if each atom contributes one free electron per conduction examine whether the electron gas is strongly degenerate at room temperature

A electron passes through a magnetic field at 60° to the field at a velocity of 3.5×10⁶m/s. What is the magnitude of the force acting on the electron having a 0.45T magnetic field?

1. A battery with a terminal voltage of 12V is connected to a circuit consisting of four 10 and one 5 resistor all in series. Assume the battery has negligible internal resistance. Calculate the current through each resistor.

2. Calculate the RC time constant, τ of a circuit having a resistance of 15 MΩ and 3 010 𝜇𝐹.

3. An RC circuit have a 9 V source and lies at a 54-seconds of time constant. Then, find the voltage across the Capacitor after 153.6 seconds of charging.

If q1 = 3.0 nC, q2 = -4.0 nC, q3 = 2.0 nC, q4 = -5.0 nC, and q5 to 8 = -1.0

nC, what is the total electrix flux for each of the closed surfaces a, b, c,

and d?

A 5.5 x10⁴ kg airplane is flying at 85m/s at an altitude of 1.2x10⁴m. Find the plane's

(a) Potential energy ,(b) kinetic energy,and (c) Mechanical energy

Given: m=5.5x10⁴kg

v=85m/s

h=1.2x10⁴m

A 500-turn solenoid have a cross-sectional area 20 m^2. If its self-inductance

is 20H, then find the length of the solenoid.

A long solenoid has 500 turns. When a current of 2 A is passed through it, the

resulting magnetic flux linked with each turn of the solenoid is 4×10

−3 Wb. find

self-inductance.

A parallel plate capacitor has square plates of side 5 cm and separated by a

distance of 1 mm. (a) Calculate the capacitance of this capacitor. (b) If a 10 V

battery is connected to the capacitor, what is the charge stored in any one of the

plates? (The value of εo = 8.85 x 10-12 Nm2 C-2)

In a solid, it is possible to generate sound waves with different velocities dependent on the deformation mode Sound generating volumetric deformations (compression) and shear deformations (shearing) are caled pre Songtudu waves) and shear waves (transverse waves), respectively. The measured speed of longitudinal sound waves in one type of steel is about 5930 meters per second. What is this speed in kilometers per hour (km/h?)