Andrew Sullivan

Numerade Educator

Biography

Hi! I am a Ph.D. Student in Physics with background in Mathematics as well.

Education

Andrew has not yet added their education credentials.

Educator Statistics

Numerade tutor for 4 years
99 Students Helped

Topics Covered

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

Andrew's Textbook Answer Videos

1

Andrew's Quick Ask Videos

04:31
Calculus 3

Derive an equation for the ratio of the surface area of a sphere
to that of a fiber with the same volume. Assume the fiber to be a
cylinder. Give the surface area ratio as a function of the ratio
sphere and cylinder diameters. Does the ratio have a minimum or
maximum? where?

Andrew Sullivan
01:02
Prealgebra

Find the long-term behavior of the following rational function (what happens as t goes to infinity?):

f(t) = 1.5t^2 - 2 + t - 1 / t + 3

As f(t) approaches infinity, what does t approach?

Andrew Sullivan
02:58
Prealgebra

Find the equation for an exponential function going through the points (1, 1.5) and (2, 0.75). Get your answer in the form f(t) = a * b^t, and enter the values you found for a and b below.

Andrew Sullivan
01:57
Physics 101 Mechanics

In a popular new mini hockey game, players use small launchers
with springs to move a 4 gram puck. Each spring has a spring
constant of 140 N/m and can be compressed up to 4 cm. Determine the
maximum speed with which the puck can be launched.
Instructions
Follow the steps below to solve this problem:
Draw a sketch of the situation, labeling all of the physical
quantities given in the problem. Identify your system in the
sketch. Make sure both the initial and final states are represented
in your sketch.
Draw a motion diagram and
a work-energy bar chart. Take the moment
when the spring is fully compressed right before the puck is
launched as your initial state and after the spring is fully
relaxed and the puck is moving at its highest speed as your final
state.
Solve for the maximum speed with which the puck can be
launched. Show all of the work necessary to reach your solution.
Start with general equations and
explain what you are doing
and why you did what you
did.
Evaluate your solution. Describe how you evaluated your answer
and whether or not you think your answer is reasonable.

Andrew Sullivan
06:09
Physics 101 Mechanics

A tennis ball of mass 57.0 g is held just above a basketball of
mass 597 g. With their centers vertically aligned, both balls are
released from rest at the same time, to fall through a distance of
1.25 m.
An illustration shows a tennis ball placed on top of a
basketball with a downward-pointing arrow shown to the side.
(a) Find the magnitude of the downward velocity with which the
basketball reaches the ground.
(b) Assume that an elastic collision with the ground
instantaneously reverses the velocity of the basketball while the
tennis ball is still moving down. Next, the two balls meet in an
elastic collision. To what height does the tennis ball rebound?

Andrew Sullivan
04:23
Physics 101 Mechanics

A bullet, which has a mass of 25.0 grams, is fired from a rifle, which has a mass of 6.25 kg, with a velocity of v = 320 m/s. After being fired, the bullet strikes a block of wood, which has a mass of M = 22.0 kg, and the bullet lodges in the block. This block of wood is attached to two vertical strings which are L = 1.25 m long.
Using energy conservation methods, determine the maximum angle θ that the mass M (and lodged bullet) will swing to after the collision (it will come to a brief halt at this maximum angle before swinging back down).
Using energy conservation methods, determine the maximum angle that the mass of wood (and lodged bullet) will swing to after the collision (it will come to a brief halt at this maximum angle before swinging back down).

Andrew Sullivan
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