Manish Jain

University of California, Davis
Professor

Biography

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Education

BS Mathematics
University of California, Davis

Educator Statistics

Numerade tutor for 5 years
2243 Students Helped

Topics Covered

Mastering Motion: Achieving Efficiency Along a Straight Line
Mastering the Rotation of Rigid Bodies: Tips & Techniques
Applications of Newton’s Laws
Oscillatory Motion
Explore the Fascinating Dynamics of Rotational Motion
Discover the Science of Sound and Hearing: Your Guide to Better Listening
Unlock the Power of Kinetic Energy: Boost Your Efficiency Today
Understanding Electromagnetic Waves: A Comprehensive Guide
Understanding Temperature and Heat: A Comprehensive Guide
Unlocking the Secrets of Thermal Properties: Understanding Matter
Unlocking the Power of Potential Energy: Discover the Benefits
Discovering the Fundamentals: Newton's Laws of Motion Explained
Understanding Moment Impulse and Collisions for Better Physics
Understanding the First Law of Thermodynamics: Key Concepts
Understanding the Second Law of Thermodynamics: Key Principles
Understanding Equilibrium and Elasticity: A Comprehensive Guide
Explore the Fascinating World of Periodic Motion - Learn More Today!
Rotational Motion
Exploring the Fascinating World of Mechanical Waves
Temperature and the Kinetic Theory of Gases
Mastering Newton's Laws: Tips for Applying Them Effectively
Superposition
Find Your Dream Job: Discover the Best Work Opportunities
Exploring the Fascinating World of Quantum Physics
Kinetic Theory Of Gases
Save Energy and Money with Effective Conservation Techniques
Kinetic Theory Of Gases
Understanding Reflection and Refraction of Light: A Comprehensive Guide
Explore the Fascinating World of Wave Optics - Unleash Its Potential
Unlock the Secrets of Fluid Mechanics with Our Expert Guide
Unlocking the Power of Magnetic Fields and Forces
Motion in 2d or 3d
Motion
Gravity, Planetary Orbits
Introduction and Vectors

manish's Textbook Answer Videos

02:53
An Introduction to Thermal Physics

It's not obvious from Figure 7.19 how the Planck spectrum changes as a function of temperature. To examine the temperature dependence, make a quantitative plot of the function $u(\epsilon)$ for $T=3000 \mathrm{K}$ and $T=6000 \mathrm{K}$ (both on the same graph). Label the horizontal axis in electron-volts.

Chapter 7: Quantum Statistics
Section 4: Blackbody Radiation
Manish Jain
01:10
An Introduction to Thermal Physics

Change variables in equation 7.83 to $\lambda=h c / \epsilon$, and thus derive a formula for the photon spectrum as a function of wavelength. Plot this spectrum, and find a numerical formula for the wavelength where the spectrum peaks, in terms of $h c / k T .$ Explain why the peak does not occur at $h c /(2.82 k T)$

Chapter 7: Quantum Statistics
Section 4: Blackbody Radiation
Manish Jain
01:06
An Introduction to Thermal Physics

Starting from equation $7.83,$ derive a formula for the density of states of a photon gas (or any other gas of ultrarelativistic particles having two polarization states). Sketch this function.

Chapter 7: Quantum Statistics
Section 4: Blackbody Radiation
Manish Jain
01:09
An Introduction to Thermal Physics

Consider any two internal states, $s_{1}$ and $s_{2},$ of an atom. Let $s_{2}$ be the higher-energy state, so that $E\left(s_{2}\right)-E\left(s_{1}\right)=\epsilon$ for some positive constant $\epsilon$ If the atom is currently in state $s_{2}$, then there is a certain probability per unit time for it to spontaneously decay down to state $s_{1}$, emitting a photon with energy $\epsilon$ This probability per unit time is called the Einstein $A$ coefficient:
$A=$ probability of spontaneous decay per unit time.
On the other hand, if the atom is currently in state $s_{1}$ and we shine light on it with frequency $f=\epsilon / h,$ then there is a chance that it will absorb a photon, jumping into state $s_{2}$. The probability for this to occur is proportional not only to the amount of time elapsed but also to the intensity of the light, or more precisely, the energy density of the light per unit frequency, $u(f)$. (This is the function which, when integrated over any frequency interval, gives the energy per unit volume within that frequency interval. For our atomic transition, all that matters is the value of $u(f) \text { at } f=\epsilon / h .)$ The probability of absorbing a photon, per unit time per unit intensity, is called the Einstein $B$ coefficient:
$B=\frac{\text { probability of absorption per unit time }}{u(f)}$
Finally, it is also possible for the atom to make a stimulated transition from $s_{2}$ down to $s_{1}$, again with a probability that is proportional to the intensity of light at frequency $f$. (Stimulated emission is the fundamental mechanism of the laser:
Light Amplification by Stimulated Emission of Radiation.) Thus we define a third coefficient, $B^{\prime},$ that is analogous to $B$ :
$B^{\prime}=\frac{\text { probability of stimulated emission per unit time }}{u(f)}$
As Einstein showed in 1917 , knowing any one of these three coefficients is as good as knowing them all.
(a) Imagine a collection of many of these atoms, such that $N_{1}$ of them are in state $s_{1}$ and $N_{2}$ are in state $s_{2} .$ Write down a formula for $d N_{1} / d t$ in terms of $A, B, B^{\prime}, N_{1}, N_{2},$ and $u(f)$
(b) Einstein's trick is to imagine that these atoms are bathed in thermal radiation, so that $u(f)$ is the Planck spectral function. At equilibrium, $N_{1}$ and $N_{2}$ should be constant in time, with their ratio given by a simple Boltzmann factor. Show, then, that the coefficients must be related by
$$B^{\prime}=B \quad \text { and } \quad \frac{A}{B}=\frac{8 \pi h f^{3}}{c^{3}}$$

Chapter 7: Quantum Statistics
Section 4: Blackbody Radiation
Manish Jain
01:01
An Introduction to Thermal Physics

Consider the electromagnetic radiation inside a kiln, with a volume of $1 \mathrm{m}^{3}$ and a temperature of $1500 \mathrm{K}$
(a) What is the total energy of this radiation?
(b) Sketch the spectrum of the radiation as a function of photon energy.
(c) What fraction of all the energy is in the visible portion of the spectrum, with wavelengths between $400 \mathrm{nm}$ and $700 \mathrm{nm} ?$

Chapter 7: Quantum Statistics
Section 4: Blackbody Radiation
Manish Jain
1 2 3 4 5 ... 250

manish's Quick Ask Videos

02:26
Physics 101 Mechanics

Table 1: Number of associate people expected to join the Swimming Pool over the coming 3 years

Years Total Number of Associate People
1 300
2 360
3 420

Task#1: (members regression and cost analysis)

A- Your report should include data for the number of members that will join the pool at the end of year 5, year 6, and year 7. Plot the relationship between years and the number of people joining the pool, using the data in the table above in addition to the data found.

B- Include in your report the total number of people that the Swimming pool will accommodate in the 6th year.

C- The Swimming Pool should have maintenance after every 5000 associate people join the Swimming Pool. You have to define in your report after how many years the first, second, and third maintenance procedures will take place.

D- Assume that the expected average cost per member per year is 350 JOD, the expected overhead cost is 45K JOD per year, and the expected cost of employee's salary and maintenance of the pool is 60K JOD per year.

1. Use Table 1 to find the average cost/year for the first 3 years individually if no member left the pool.
2. Use dimensional analysis to find a function to calculate the average profit/year and ensure that the derived function you found is dimensionally consistent.

E- The interviewer requests data to be provided by the statistic department about the average members' fee/year in the area where the pool is intended to be built. The data provided by the statistical department is in the attached Excel file. The data is collected from 100 pools. The members' fee/year is found to have a normal distribution probability function.

1. Find the range, mean, and standard deviation of the data. You may use a software package for this part. However, you must show the equations applicable to this problem.
2. Draw a histogram of the data with a bin width of 100 JOD. You may use a software package for this part.
3. What is the probability that at a given pool the fee will be between 1200 and 1600 JOD?
4. Statistics from the statistical department state that the average members' fee in that particular area is less than 1150 ± 170 JOD (μ ± σ). Your team suspects this statistic is an underestimation and consequently commences their own study by studying 100 pools and finding that μ_sample = 1150. Based on this information, conduct a hypothesis test to determine whether the statistical department's statistic is an underestimate or not at a 0.05 level of significance.

F- The marketing department modeled the probability of the ability of the members to pay more than 1150 JOD/year with a binomial probability distribution, where the probability of paying more than 1150 JOD/year is p = 0.71. For a population of 1000 members, if you choose a sample of 30 members, address the following:

1. What is the probability of having exactly 20 members that would pay more than 1150 JOD?
2. What is the probability of having no members that would pay more than 1150 JOD?

H- Use your answers from parts A, B, C, and D to give the investor an estimation and recommendation about the associate members' fees. Note that the investor does not have a technical background about the statistical terms, so you have to clarify for him in simple words what each term means and indicate.

Task#3: Checking the structural safety of the beams.

In order to check the overall structural safety for the skylight slab of the Olympiad swimming pool, you were requested to check the strength of the beams. This requires making an analysis of the beams and finding the internal forces in each beam. The following figure shows a segment of the skylight slab of the Olympiad swimming pool and it shows the points where the beams are attached. In your analysis report, you are expected to:

1. Represent beam BC in vector form and find the length of the beam using the formula for the vector resultant.
2. Represent the force in the beam in vector form. If each beam is carrying half the weight of the slab, consider the weight to be 7000 kg. You have to find the force in each beam.

Manish Jain
04:40
Physics 101 Mechanics

An object of mass m=0.5
kg starting from rest at point A, as shown in
the figure below, is pushed by a horizontal applied force of
magnitude F=3 N on a horizontal
tabletop, which is a distance h=4
m above the floor. The table top has a
coefficient of
friction ÎĽk=0.2. When
the object reaches the end of the table (point B)
located 6 m away from point A,
it collides with an identical object. The two objects stick
together and are launched horizontally off the table, following the
trajectory shown in the figure below, and strike the floor at point
D. Air resistance is negligible in this entire problem.
You MUST use g=10 m/s/s. You MUST round
your answers to the nearest tenth. Do NOT
include units in your answers. You MUST use the LOR shown in the
figure.
Calculate the following:
(1) The magnitude of the object's acceleration as it's moving
from A to B, in m/s/s,
(2) The object's velocity in magnitude at point B, right before
it collides with the second object, in m/s,
(3) The total momentum of the two-object system right after
collision, the instant it's being launched off the table, in
kg*m/s,
(4) The magnitude of the velocity of the object formed as a
result of the inelastic collision right after collision, the
instant it's being launched off the table, in m/s,
(5) The potential energy of the object formed as a result of the
inelastic collision at point C, in J,
(6) The kinetic energy of the object formed as a result of
the inelastic collision at point C, in J,
(7) The speed of the object formed as a result of the
inelastic collision at point C, in m/s,
(8) The kinetic energy of the object formed as a result of the
inelastic collision at point D, in J,
(9) The speed of the object formed as a result of the inelastic
collision at point D, in m/s,
(10) The potential energy of the object formed as a result of
the inelastic collision at point D, in J,
(11) The magnitude of the vertical velocity of the object formed
as a result of the inelastic collision at point D, in
m/s,
(12) The magnitude of the horizontal velocity of the object
formed as a result of the inelastic collision at point D, in
m/s,
(13) The hang time of the object formed as a result of the
inelastic collision (total time in the air), in s,
(14) The horizontal distance traveled by the object formed as a
result of the inelastic collision as it moves in projectile motion,
in m,
(15) The work done by the force of friction on the object
traveling on the table from A to B, in J,
(16) The work done by the applied force on the object traveling
on the table from A to B, in J

Manish Jain
03:58
Physics 101 Mechanics

5- A 1,141-kg car traveling initially at 34 m/s in an easterly direction crashes into the back of a 9,759-kg truck moving in the same direction at 22 m/s. The velocity of the car immediately after the collision is 19 m/s to the east. What is the velocity of the truck immediately after the collision?

7- A 1.3-kg block is attached to the end of a 1.8-m string to form a pendulum. The pendulum is released from rest when the string is horizontal. At the lowest point of its swing when it is moving horizontally, the block is hit by a 0.02-kg bullet moving horizontally in the opposite direction. The bullet remains in the block and causes the block to come to rest at the low point of its swing. What was the magnitude of the bullet's velocity just before hitting the block?

8- A pendulum consists of a 2.2-kg block hanging on a 1.9-m length string. A 0.01-kg bullet moving with a horizontal velocity of 801 m/s strikes, passes through, and emerges from the block (initially at rest) with a horizontal velocity of 387 m/s. To what maximum height above its initial position will the block swing? Write your answer in meters.

9- A 6.0-kg object, initially at rest in free space, "explodes" into three segments of equal mass. Two of these segments are observed to be moving with equal speeds of 20 m/s with an angle of 60° between their directions of motion. How much kinetic energy is released in this explosion?

10- A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x-axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x-axis. What is the speed of the 4.0-kg mass after the collision?

Manish Jain
03:43
Physics 101 Mechanics

Objectives:
To explore concepts of kinetic, potential, and total energy with and without friction.

Theory:
Kinetic Energy: KE = ½mv²
Gravitational Potential Energy: PE = mgh
Total Mechanical Energy: E = KE + PE = mgh + ½mv²
Conservation of energy law:
Ef = Ei or
Ef - Ei = 0 if Ffr = 0
Ef – Ei = Wfr if Ffr ≠ 0

Fg, the gravitational force, is a conservative force. The work done by the conservative force does not depend on the path. In an alternative formulation: the work done by the gravitational force only depends on the starting and ending elevations, the path taken between those points does not make any difference.

Procedure:
The lab activity uses a simulation developed by the University of Colorado at Colorado Boulder. Conservation of Energy
From the main page “Energy Skate Park,” select “Playground.” (You may need to click twice.)
From the upper right corner, select: “Stick to Track” and “Speed.” Drag the 3 red dots from the bottom of the screen to design a ramp (straight line).
Each of the three dots can be dragged individually to change the shape of the track.
Select the “Grid” and “Reference Height” option in the lower left corner. Adjust the height = 0 reference by dragging the yellow up and down arrows so that the dashed blue line passes through the center of the lowest red dot.
Drag the first dot to any height you wish.
If you click on the middle dot, you have the option to delete it.
Press the “Pause” button then place the skater on the top of the hill. Select “Slow.” The “Play” and “frame by frame” should be displayed.
There is a yellow tape measure tool in the lower right that can be used to measure the height.

Analysis:
Motion without friction.
Click “Play” and watch the simulation and notice the “speedometer.” Press Pause again and click “Reset Skater.” Use the frame by frame option to move the skater down the hill.
You can hold down the “frame by frame” button. If you go too far, you can reset and try again.
In the table below, the 1st row, the skater starts from rest, v = 0m/s, and the initial height is your choice. The last row corresponds to the skater reaching the ground level (h = 0) and you need to record in the table the skater’s speed.
Choose 2 more points in the animation while the skater comes down the hill and record the heights and speeds in the table below.
Calculate the initial KE, PE, and total mechanical energy E for all points.
DO NOT type the units in each cell of a table, they are in the table’s header. DO NOT include calculations in the tables, just your answers to two significant digits.
Mass of the skater, m = (ENTER MASS HERE) kg
Move the slide bar on “Friction” to “None” for this part of the lab.

Height (m) | Speed (m/s) | PE (J) | KE (J) | E (J)
--- | --- | --- | --- | ---
1 | 0 | | |
2 | | | |
3 | | | |
4 | 0 | | |

Questions:
Does the Total Mechanical Energy for the skater stay the same?

Place the skater at the same height that you initially started with but in the air. Click play and let the skater free fall.
What is the speed of the skater when they get to h = 0m?
Is it different than the speed from the table corresponding to h = 0m?
What effect would you expect track-skateboard friction to have?

Motion with friction:
Keep the same ramp that you used in part I but move the slide bar on “Friction” toward “Lots” for this part of the lab.
Place the skater on the top of the hill, select “Pause” and “Restart Skater” such as the frame by frame option is available.
Repeat the steps from part I of the lab activity and complete the table below.

Height (m) | Speed (m/s) | PE (J) | KE (J) | E (J)
--- | --- | --- | --- | ---
1 | 0 | | |
2 | | | |
3 | | | |
4 | 0 | | |

Questions:
Does the Total Mechanical Energy for the skater stay the same?

A skater starts from rest v1 = 0, from the top of an h = 6m hill and travels d = 20m until it gets to the bottom of the hill where its speed is v2 = 1.2m/s. If the skater has m = 50kg, what is the friction force? Recall that Ef ≠ Ei in the presence of friction.
Ef – Ei = Wfr = -Ffrd

Manish Jain
05:14
Physics 101 Mechanics

An 80 kg woman jumps from a wall and lands stiff-legged in soft sand. The woman's downward speed just as she touches the sand is 6 m/s. She is stopped after sinking 0.05 m into the sand. Calculate the net force on the woman while she is being stopped by the sand.

Manish Jain
02:53
Physics 101 Mechanics

I. In the Theorem of Pappus, the center of mass is always located inside the region or area of the figure.
II. In addition, the center of mass is always equal to the geometric centroid.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

2. I. For springs obeying Hooke's Law, the work required to compress the material by dx distance is always less than the requirement to stretch it by the same dx distance.
II. The spring constant is dependent on the amount of force required to stretch it by some x distance.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

3. I. As two objects move farther away from each other, the force of attraction between them decreases.
II. Thus, if the force of attraction decreases with distance, the work shall decrease as well.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

4. I. For a positively charged q1 and negatively charged q2, the force will always be positive regardless of the signs.
II. Thus, in calculus, the signs of the charges do not affect the work or force between them.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

5. I. In evaluating the moment of a planar lamina, a horizontal strip cannot be used as a representative area.
II. The moment of any planar lamina is the product of the mass of the region and its centroid.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

6. I. For an object submerged in y distance from the water level, as y increases, the pressure experienced by the object decreases.
II. The same object placed in containers with three different areas submerging by the same depth will have a varying pressure depending on the containers.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

7. I. The reaction kinetics of order 0 cannot be evaluated using the concept of integration.
II. If the order of reaction is 1 in PFR, given ?, and % conversion, the initial amount is not necessary to find ?.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

8. I. In filtration using calculus, the fictitious volume (V) is considered a variable, like the filtrate (Q).
II. If the operation is a constant-rate process, the rate is always the ratio of the amount to be filtered and the time elapsed to obtain the necessary filtrate.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

9. I. In a normal distribution curve, an average of 0 means that any value below 0 shall be located to its left.
II. Thus, scores within the 3ĂŹĆ’ to the left and right of the mean comprise at least 99% of the population's scores.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

10. I. In the Cartesian coordinate plane, single integration produces an area under the curve (or between two curves).
II. In a three-dimensional system, single integration of an arc produces an area called the line integral.
a. Both statements are true
b. Both statements are false
c. Statement I is true, the latter being false
d. Statement I is false, the latter being true

Manish Jain
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