Ely Crowder

Numerade Educator
Teaching Assistant

Biography

Currently a physics PhD student, after receiving Bachelor's degrees in physics, astrophysics, and mathematics. I have 5 years of teaching and/or tutoring experience in undergraduate physics and mathematics.

Education

Ely has not yet added their education credentials.

Educator Statistics

Numerade tutor for 5 years
71 Students Helped

Topics Covered

Unlocking the Power of Potential Energy: Discover the Benefits
Save Energy and Money with Effective Conservation Techniques
Atoms, Molecules, and Ions: Understanding the Building Blocks of Matter
Exploring the Fascinating World of Quantum Physics
Understanding Gauss's Law: A Comprehensive Guide

Ely's Textbook Answer Videos

03:07
Physics for Scientists and Engineers with Modern Physics

(II) The neutrons in a parallel beam, each having kinetic energy $0.030 \mathrm{eV}$, are directed through two slits $0.60 \mathrm{~mm}$ apart. How far apart will the interference peaks be on a screen $1.0 \mathrm{~m}$ away? [Hint: First find the wavelength of the neutron.

Chapter 38: Quantum Mechanics
Ely Crowder
01:52
Physics for Scientists and Engineers with Modern Physics

(I) A proton is traveling with a speed of $(7.560 \pm 0.012) \times 10^{5} \mathrm{~m} / \mathrm{s} .$ With what maximum precision
can its position be ascertained?

Chapter 38: Quantum Mechanics
Ely Crowder
02:08
Physics for Scientists and Engineers with Modern Physics

(I) A radioactive element undergoes an alpha decay with a lifetime of $12 \mu$ s. If alpha particles are emitted with $5.5-\mathrm{keV}$ kinetic energy, find the uncertainty $\Delta E / E$ in the particle energy.

Chapter 38: Quantum Mechanics
Ely Crowder
03:27
Physics for Scientists and Engineers with Modern Physics

(II) A 12-g bullet leaves a rifle horizontally at a speed of $180 \mathrm{~m} / \mathrm{s}$. ( $a$ ) What is the wavelength of this bullet? $(b)$ If the position of the bullet is known to a precision of $0.65 \mathrm{~cm}$ (radius of the barrel), what is the minimum uncertainty in its vertical momentum?

Chapter 38: Quantum Mechanics
Ely Crowder
01:58
Physics for Scientists and Engineers with Modern Physics

(II) How accurately can the position of a 3.50 -keV electron be measured assuming its energy is known to $1.00 \% ?$

Chapter 38: Quantum Mechanics
Ely Crowder
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Ely's Quick Ask Videos

05:41
Physics 101 Mechanics

A 18.5 -m-long copper wire, 1.95 mm in diameter including
insulation, is tightly wrapped in a single layer with adjacent
coils touching, to form a solenoid of diameter 2.57 cm. What is the
length L of the solenoid? Answer in m. What is the magnetic
field at the center when the current in the wire is 18.8 A? Answer
in T.

Ely Crowder
12:06
Physics 101 Mechanics

10. The velocity of a 3.00 kg particle is given by (8.00ti + 3.00t^2j) m/s, with time t in seconds. At the instant the net force on the particle has a magnitude of 35.0 N, what are the directions (relative to the positive direction of the x-axis) of (a) the net force and (b) the particle's direction of travel?
11. An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1100 N. The coefficient of static friction between the box and the floor is 0.35. (a) What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand, and (b) what is the weight of the sand and box in that situation?
12. A single force acts on a 3.0 kg particle-like object whose position is given by x = 3.0t - 4.0t^2 + 1.0t^3, with x in meters and t in seconds. Find the work done by the force from t = 0 to t = 4.0 s.

Ely Crowder
03:32
Physics 101 Mechanics

Three point charges $q_1$, $q_2$, and $q_3$ are situated at three corners of a rectangle as shown in the diagram below. Here $q_1 = +9.00 , mu C$, $q_2 = -9.00 , mu C$, $q_3 = +9.40 , mu C$.
(a) What is the electric potential at the center of the rectangle?
(b) What charge should be placed at the free corner for the electric potential at the center of the rectangle to be zero? Include the sign of the value in your answer.

Ely Crowder
05:56
Physics 101 Mechanics

Problem 12: Consider the two-sided chamber shown, where the right half has a volume of V = 660 L and the left half has a volume of 2V. The chamber has a seal which separates the right from the left half. The chamber is sealed and an ideal gas is pumped into the right side at a pressure P = 4.6 atm and temperature T = 76° C. The seal between the two sides is then opened.

Part (a) If the physical temperature decreases by a factor of 2 while the gas fills the chamber, what is the new pressure, in kilopascals?

Part (b) The chamber is then sealed again, trapping 2/3 of the gas molecules in the left side. The temperature of the left side is then doubled, back to the original temperature T. What is the pressure in the left side of the chamber now, in kilopascals?

Ely Crowder
06:17
Physics 101 Mechanics

What are the charge on and the potential difference across each capacitor in the figure (Figure 1) if V = 6.0V?
You may want to review (Page 714).
For help with math skills, you may want to review:
Rearrangement of Equations Involving Multiplication and Division

Ely Crowder
03:33
Physics 101 Mechanics

An electron in an old-fashioned TV camera tube is moving at 6.60x10^6 m/s in a magnetic field of strength 63 mT. What is the maximum magnitude of the force acting on the electron due to the field? 6.65x10^-14 N. What is the minimum magnitude of the force acting on the electron due to the field? 0.00 N. At one point the electron has an acceleration of magnitude 6.671x10^16 m/s^2. What is the angle between the electron velocity and the magnetic field?

Ely Crowder
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