PR

Paul Roundy

University of California, Berkeley
Teacher

Biography

I have been teaching physics and chemistry for the past 25 years. I have created a YouTube channel to help my students titled "The Scientific Adventures of Beardman", which has most of the videos for high school physics, as well as a large number of videos explaining the concept builders on PhysicsClassroom.com.

Education

BS Chemistry
University of California, Berkeley

Educator Statistics

Numerade tutor for 5 years
41 Students Helped

Topics Covered

Unlocking the Power of Potential Energy: Discover the Benefits
Save Energy and Money with Effective Conservation Techniques

Paul's Textbook Answer Videos

1

Paul's Quick Ask Videos

02:20
Algebra

What is the square footage of the lot described in this legal
description: NE 1/4 of the SW 1/4 of the SE 1/4 of the NW 1/4 of
the W 1/2?
a. 544,500 square feet
b. 653,400 square feet
c. 65,430 square feet
d. 54,450 square feet
01:35
Algebra

A support pole for an ancient structure is found to
have one-sixth of the carbon-14 of a modern, living tree.
How long ago did the tree used to make the support pole die? Give
your answer to the nearest whole number. (Assume that half-life
of carbon-14 is 5770 years.)
06:33
Physics 101 Mechanics

Given a half-Atwood machine with one mass on a tabletop with friction, a frictionless pulley, and a second mass suspended by a string connected to the first mass, use the conservation of energy to determine the speed of the mass on the tabletop after it has moved a fixed distance. Givens: masses of two objects, moment of inertia of the pulley, and the kinetic coefficient of friction for the tabletop.
01:07
Algebra

The function for the total cost for producing x units of a product is F(x) = 24.8x + 1,895. What is the marginal cost of producing one more unit? Do not include the dollar sign in your answer.
04:56
Physics 101 Mechanics

A real battery is not just an emf. We can model a real
1.5 VV battery as a 1.5 VV emf in series with a
resistor known as the "internal resistance", as shown in the
figure(Figure 1). A typical battery has 1.0 ΩΩ internal
resistance due to imperfections that limit current through the
battery. When there's no current through the battery, and thus no
voltage drop across the internal resistance, the potential
difference between its terminals is 1.5 VV, the value of the
emf. Suppose the terminals of this battery are connected to a
2.7 ΩΩ resistor.
1.
What is the potential difference between the terminals of the
battery?
2.
What fraction of the battery's power is dissipated by the
internal resistance?
07:05
Physics 101 Mechanics

A mass m1 = 3.6 kg rests on a frictionless table and connected
by a massless string to another mass m2 = 5.8 kg. A force of
magnitude F = 38 N pulls m1 to the left a distance d = 0.85 m. What
is the final speed of the two blocks? m/s 4) How much work is done
by the tension (in-between the blocks) on block m2? J 5) What is
the tension in the string? N 6) The net work done by all the forces
acting on m1 is: positive zero negative 7) What is the NET work
done on m1?
1 2 3 4 5 ... 7