TutorMe homepage

SIGN IN

Start Free Trial

Marc B.

Senior Mechanical Engineering Student at Cal Poly SLO

Tutor Satisfaction Guarantee

Physics (Newtonian Mechanics)

TutorMe

Question:

A 20 Newton force is applied to a 2kg block that rests on a desk. The block is on the verge of sliding. What is the coefficient of static friction?

Marc B.

Answer:

Since the block is on the verge of sliding, we know frictional force, Fr, is equal to the applied force, F. We also know that in this case Fr is equal to the coefficient of static friction, mus, times the normal force, N or Fr=F=mus*N. In this case the normal force is the weight of the block. On earth gravity is 9.8 m/s^2 so the normal force N=2kg(9.8m/s^2)=19.6N. Putting it together, 20N=mus*19.6N. Solving for mus, mus=1.02

Calculus

TutorMe

Question:

Evaluate the following, integral(sin(x)*x dx)

Marc B.

Answer:

The best method for solving this problem is through integration by parts. Let u=x and dv=sin(x). Therefore, du=dx v=-cos(x). Integration by parts takes the form, u*v-integral(v*du). This leads to -x*cos(x)-integral(-cos(x)dx). The integral of -cos(x) is -sin(x). Thus, the answer is -x*cos(x)+sin(x)

Algebra

TutorMe

Question:

If f(x)=x^2-5x+4, what is f(3)-f(2)?

Marc B.

Answer:

f(3)=3^2-5*3+4 f(3)=9-15+4 f(3)=-2 f(2)=2^2-5*2+4 f(2)=4-10+4 f(2)=-2 f(3)-f(2)=-2-(-2) f(3)-f(2)=0

Send a message explaining your

needs and Marc will reply soon.

needs and Marc will reply soon.

Contact Marc

Ready now? Request a lesson.

Start Session

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 Session" 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.

Made in California

© 2018 TutorMe.com, Inc.