Enable contrast version

# Tutor profile: Brad W.

Inactive
High School AP Physics Teacher
Tutor Satisfaction Guarantee

## Questions

### Subject:Pre-Calculus

TutorMe
Question:

If $$sec(\theta)=\frac{5}{3}$$ and 0°<θ<90°, what is $$cos(θ)$$?

Inactive

$$cos(\theta)=\frac{1}{sec(θ)}$$ so $$cos(\theta)=\frac{1}{\frac{5}{3}}=\frac{3}{5}$$

### Subject:Calculus

TutorMe
Question:

What is the derivative of $$f(x)=sin(3x)$$?

Inactive

To take the derivative of this function requires the chain rule which states if $$f(x)=g(h(x))$$ then $$f'(x)=g'(h(x))* h'(x)$$. In this problem, $$g(x)=sin(x)$$ and $$h(x)=3x$$ so $$g'(x)=cos(x)$$ and $$h'(x)=3$$. Substituting these into the chain rule, $$f'(x)=cos(3x)*3=3cos(3x)$$.

### Subject:Physics

TutorMe
Question:

A block of mass $$2.5 kg$$ is pushed $$2.2 m$$ along a frictionless horizontal table by a $$16 N$$ pushing force directed $$25^{o}$$ below the horizontal. Is the work done by the pushing force positive, negative, or zero?

Inactive

The work done by the pushing force is positive because a component of the pushing force is in the direction of the mass's motion.

## Contact tutor

Send a message explaining your

## 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.