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Keshav Singh

University of Kwazulu-Natal

Biography

I have had experience lecturing and tutoring introductory level undergraduate courses in Physics at the University of KwaZulu Natal in South Africa. I have experience tutoring introductory level mathematics courses as well. During this time; I had also completed my MSc in Physics at the same institution, cum laude. I am currently working towards a PhD in Applied Mathematics, with a speciality in higher dimensional gravity.

Teaching is a passion of mine and I am always looking for interesting and innovative ways of keeping science and maths fun and engaging for my students. I always attempt to articulate my lessons as best I can.

Education

MS Physics
University of Kwazulu-Natal

Topics Covered

Atomic Physics
Kinetic Energy
Potential Energy
Energy Conservation
Electromagnetic Waves
Wave Optics
Periodic Motion
Mechanical Waves
Sound and Hearing
Current, Resistance, and Electromotive Force
Electromagnetic Induction
Inductance
Electric Charge and Electric Field
Gauss's Law
Direct-Current Circuits
Motion Along a Straight Line
Motion in 2d or 3d
Nuclear Physics
Gravitation
The First Law of Thermodynamics
The Second Law of Thermodynamics
Newton's Laws of Motion
Rotation of Rigid Bodies
Dynamics of Rotational Motion
Equilibrium and Elasticity
Magnetic Field and Magnetic Forces
Sources of Magnetic field
Reflection and Refraction of Light
Kinetic Theory Of Gases
Relativity
Alternating Current
Physics Basics
Temperature and Heat
Particle Physics
Moment, Impulse, and Collisions
Applying Newton's Laws
Fluid Mechanics
Thermal Properties of Matter
Quantum Physics
Work
Capacitance and Dielectrics
Electric Potential
Applications of Newton’s Laws
Introduction and Vectors
Electric Forces and Electric Fields
Complex Numbers
Differential Equations
Applications of the Derivative
Differential Equations
Mechanical Waves
Fluid Mechanics
Superposition
Condensed Matter Physics
Electric Potential and Capacitance
Kinetic Theory Of Gases
Spectroscopy
Oscillatory Motion
Second-Order Differential Equations
Vectors and Vector Valued Functions

Keshav's Textbook Answer Videos

06:17
University Physics with Modern Physics

A telescope is constructed from two lenses with focal lengths of 95.0 cm and 15.0 cm, the 95.0-cm lens being used as the objective. Both the object being viewed and the final image are at infinity. (a) Find the angular magnification for the telescope. (b) Find the height of the image formed by the objective of a building 60.0 m tall, 3.00 km away. (c) What is the angular size of the final image as viewed by an eye very close to the eyepiece?

Chapter 34: Geometric Optics
Section 8: Microscopes and Telescopes
Keshav Singh
02:23
University Physics with Modern Physics

When an object is placed at the proper distance to the left of a converging lens, the image is focused on a screen 30.0 cm to the right of the lens. A diverging lens is now placed 15.0 cm to the right of the converging lens, and it is found that the screen must be moved 19.2 cm farther to the right to obtain a sharp image. What is the focal length of the diverging lens?

Chapter 34: Geometric Optics
Keshav Singh
05:47
University Physics with Modern Physics

You have 1.50 kg of water at 28.0$^\circ$C in an insulated container of negligible mass. You add 0.600 kg of ice that is initially at -22.0$^\circ$C. Assume that no heat exchanges with the surroundings. (a) After thermal equilibrium has been reached, has all of the ice melted? (b) If all of the ice has melted, what is the final temperature of the water in the container? If some ice remains, what is the final temperature of the water in the container, and how much ice remains?

Chapter 17: Temperature and Heat
Section 7: Mechanisms of Heat Transfer
Keshav Singh
16:03
University Physics with Modern Physics

Oxygen (O$_2$) has a molar mass of 32.0 g/mol. What is (a) the average translational kinetic energy of an oxygen molecule at a temperature of 300 K; (b) the average value of the square of its speed; (c) the root-mean-square speed; (d) the momentum of an oxygen molecule traveling at this speed? (e) Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.10 m on a side. What is the average force the molecule exerts on one of the walls of the container? (Assume that the molecule's velocity is perpendicular to the two sides that it strikes.) (f) What is the average force per unit area? (g) How many oxygen molecules traveling at this speed are necessary to produce an average pressure of 1 atm? (h) Compute the number of oxygen molecules that are contained in a vessel of this size at 300 K and atmospheric pressure. (i) Your answer for part (h) should be three times as large as the answer for part (g). Where does this discrepancy arise?

Chapter 18: Thermal Properties of Matter
Section 3: Kinetic-Molecular Model of an Ideal Gas
Keshav Singh
06:32
University Physics with Modern Physics

(a) Compute the specific heat at constant volume of nitrogen (N$_2$) gas, and compare it with the specific heat of liquid water. The molar mass of N$_2$ is 28.0 g/mol. (b) You warm 1.00 kg of water at a constant volume of 1.00 L from 20.0$^\circ$C to 30.0$^\circ$C in a kettle. For the same amount of heat, how many kilograms of 20.0$^\circ$C air would you be able to warm to 30.0$^\circ$C? What volume (in liters) would this air occupy at 20.0$^\circ$C and a pressure of 1.00 atm? Make the simplifying assumption that air is 100% N$_2$.

Chapter 18: Thermal Properties of Matter
Section 4: Heat Capacities
Keshav Singh
05:13
University Physics with Modern Physics

A uniform marble rolls down a symmetrical bowl, starting from rest at the top of the left side. The top of each side is a distance $h$ above the bottom of the bowl. The left half of the bowl is rough enough to cause the marble to roll without slipping, but the right half has no friction because it is coated with oil. (a) How far up the smooth side will the marble go, measured vertically from the bottom? (b) How high would the marble go if both sides were as rough as the left side? (c) How do you account for the fact that the marble goes $higher$ with friction on the right side than without friction?

Chapter 10: Dynamics of Rotational Motion
Section 3: Rigid-Body Rotation About a Moving Axis
Keshav Singh
1 2 3 4 5 ... 981

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