Enable contrast version

Tutor profile: Thomas D.

Inactive
Thomas D.
Adjunct Instructor and High School Teacher
Tutor Satisfaction Guarantee

Questions

Subject: Physics (Waves and Optics)

TutorMe
Question:

Calculate the energy of a 532 nm photon in Joules.

Inactive
Thomas D.
Answer:

Planck's constant relates energy of a wave to its wavelength using E=hc/λ where E is the energy of the wave, h is planck's constant (6.626x10^-34 J*s), c is the speed of light (3x10^8 m/s), and λ is the wavelength of the wave in meters. First, change the wavelength from nm to m. 532 nm / (1x10^9 nm/1 m) = 5.32x10^-7 m. Plugging in the constants and the wavelength, E=(6.626x10^-34 J*s)(3x10^8 m/s)/5.32x10^-7 m. Which equals 3.73x10-19 J of energy.

Subject: Pre-Calculus

TutorMe
Question:

Simplify cos(x)/tan(x)

Inactive
Thomas D.
Answer:

The answer is csc(x). tan(x) is sin(x)/cos(x). Plugging this in we get, cos(x)/sin(x)/cos(x). The cos(x) cancel giving 1/sin(x) which is csc(x).

Subject: Chemistry

TutorMe
Question:

What is the empirical formula for a compound with 16 g of oxygen 3 g of hydrogen and 12 grams of carbon?

Inactive
Thomas D.
Answer:

You must first find the molar ratios of each element in the compound. Oxygen's molar mass is 16 g/mol, hydrogen is 1 g/mol, and carbon is 12 g/mol. Therefore, there is 16 g/(16g/mol)= 1 mole of oxygen. There is 3 g/ (1g/mol)= 3 moles of hydrogen. There is 12 g/(12 g/mol)= 1 mole of carbon. Therefore the ratio of O:H:C is 1:3:1. So the formula is CH3O.

Contact tutor

Send a message explaining your
needs and Thomas will reply soon.
Contact Thomas

Request lesson

Ready now? Request a lesson.
Start Lesson

FAQs

What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Lesson" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.