Keshav Singh

University of Kwazulu-Natal
University Lecturer: Physics

Biography

I have completed a Masters degree in Physics and am currently completing a PhD in Applied Mathematics. I am passionate about science and mathematics and dream of someday being a teacher/tutor or lecturer. I have two years of experience teaching introductory physics courses at university level.

Education

MS Physics
University of Kwazulu-Natal

Educator Statistics

Numerade tutor for 6 years
5945 Students Helped

Topics Covered

Exploring the Wonders of Atomic Physics: A Comprehensive Guide
Unlock the Power of Kinetic Energy: Boost Your Efficiency Today
Unlocking the Power of Potential Energy: Discover the Benefits
Save Energy and Money with Effective Conservation Techniques
Understanding Electromagnetic Waves: A Comprehensive Guide
Explore the Fascinating World of Wave Optics - Unleash Its Potential
Explore the Fascinating World of Periodic Motion - Learn More Today!
Exploring the Fascinating World of Mechanical Waves
Discover the Science of Sound and Hearing: Your Guide to Better Listening
Calculating Electrical Power: Resistance and EMF
Electromagnetic Induction: Understanding the Science and Applications
Understanding Inductance: A Comprehensive Guide
Understanding Electric Charge and Field: A Comprehensive Guide
Understanding Gauss's Law: A Comprehensive Guide
Master Direct Current Circuits with Our Expert Guide
Mastering Motion: Achieving Efficiency Along a Straight Line
Motion in 2d or 3d
Discover the Fascinating World of Nuclear Physics
Discover the Power of Gravitation: Exploring the Science Behind It
Understanding the First Law of Thermodynamics: Key Concepts
Understanding the Second Law of Thermodynamics: Key Principles
Discovering the Fundamentals: Newton's Laws of Motion Explained
Mastering the Rotation of Rigid Bodies: Tips & Techniques
Explore the Fascinating Dynamics of Rotational Motion
Understanding Equilibrium and Elasticity: A Comprehensive Guide
Unlocking the Power of Magnetic Fields and Forces
Discovering the Sources of Magnetic Fields: A Comprehensive Guide
Understanding Reflection and Refraction of Light: A Comprehensive Guide
Kinetic Theory Of Gases
Relativity
Understanding Alternating Current: A Comprehensive Guide
Master the Fundamentals of Physics: Learn Physics Basics
Understanding Temperature and Heat: A Comprehensive Guide
Discover the Fascinating World of Particle Physics Today
Understanding Moment Impulse and Collisions for Better Physics
Mastering Newton's Laws: Tips for Applying Them Effectively
Unlock the Secrets of Fluid Mechanics with Our Expert Guide
Unlocking the Secrets of Thermal Properties: Understanding Matter
Exploring the Fascinating World of Quantum Physics
Find Your Dream Job: Discover the Best Work Opportunities
Capacitance and Dielectrics: Understanding the Basics
Unlocking the Power of Electric Potential: Exploring its Benefits
Applications of Newton’s Laws
Introduction and Vectors
Electric Forces and Electric Fields
Understanding Complex Numbers: A Comprehensive Guide
Differential Equations
Applications of the Derivative
Differential Equations Made Simple: Expert Tips & Resources
Mechanical Waves
Fluid Mechanics
Superposition
Condensed Matter Physics
Electric Potential and Capacitance
Kinetic Theory Of Gases
Spectroscopy
Oscillatory Motion
Mastering Second Order Differential Equations: Tips and Techniques
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 ... 980

Keshav's Quick Ask Videos

01:59
Physics 101 Mechanics

How far will a car go while accelerating at 4m/s^2 for 7.0s if it ws initially going 10m/s? Acceleration is constant

Keshav Singh
01:58
Physics 101 Mechanics

What is gravity?

Keshav Singh
02:55
Physics 101 Mechanics

1) In order to pass a physical education class at a
university, a student must run 1.0 mi in 11.7 min. After running
for 10 min, she still has 530 yd to go. If her maximum acceleration
is 0.15 m/s2, can she make it? (Assume the student runs at a
constant speed for the first 10.0 min.)

Keshav Singh
02:28
Physics 101 Mechanics

You wish to prepare an ice less cold drink by mixing 100g of
green coffee at 67 oC and 18 g of ice at
-8 oC. What would the the temperature (in
degree Celcius) of your cold coffee once you are done?
(specific heat of green coffee is 1400 J/kg K)

Keshav Singh
05:09
Physics 101 Mechanics

Consider the physics of a rear-end automobile collision in which
both cars are engineered to absorb as much energy by crumpling as
possible on impact in order to lessen injury to its occupants. One
of the vehicles is stopped at a light, the other runs into it from
the rear at 60 km/h. Assume both vehicles have a mass of 1300 kg
and that there are unrestrained occupants in both with masses of 75
kg.
1. What is the resulting motion of the pair of cars?
2. Within the frame of reference of each car, how much momentum
does an occupant have after the collision?
3. If the occupant of the incident car is not protected by an
air bag, with what velocity in m/s does he strike the windscreen
following the collision?
4. Assuming the collision duration is 0.2 seconds, what
acceleration backward does the occupant of the stationary car feel
on impact? (Compare to the acceleration of gravity.) Be sure to
explain your reasoning. We are looking to see what you understand
about inelastic collisions.

Keshav Singh
01:27
Physics 101 Mechanics

A simple pendulum is a mass m that hangs from a very light string of length l.
Simple Pendulum
T = 2π√(l/g)
The period of a simple pendulum (T) is the time it takes for the pendulum to make one complete swing (a round trip). g is "little g" and is the acceleration due to gravity.
You can do an experiment of measuring the period (T) as a function of string length (l).
You linearize the equation so that you can plot your experimental data and apply a linear trendline. You put [ Select ] on the horizontal axis and [ Select ] on the vertical axis.

Keshav Singh
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