D1-1.
An object has a net charge of 25 C. Does it have more electrons or
protons and how many more?
[1.5625x1014 more electrons]
D1-2.
An object has a net charge of +4 nC. Does it have more electrons or
protons and how many more?
[2.5x1010 more protons]
D
(Rotational Motion with Uniform Acceleration)
After final exams, you hop into your car and speed away from CBU. Assuming
that you accelerate uniformly from rest at t=0 to a speed of 15 m/s in 5 seconds and
that the diameters of your tires are 60 cm, answe
You should know how to do the following:
1. Find how many extra electrons or protons an object has if its net charge is given.
2. Find the net electric force exerted on a point charge by one or more other point
charges.
3. Find the net electric field at a
Test 1 :
1. Convert a quantity from one set of units to another set of units.
2. Convert a 2-D vector from rectangular form (components) to polar form
(magnitude and angle), or from polar form to rectangular form.
3. Add or subtract two or more vectors.
4
You should know how to do the following:
1. Find the work done by a force in moving an object through a displacement.
2. Know that power is the rate at which work is done (or the rate at which energy is delivered or
used). Find the power delivered or used
1. A capacitor is made out of two round plates separated by 0.5 mm. Each plate
has a radius of 5 mm. The space between the plates is filled with Teflon, which has
a dielectric constant of 2.1. Find the capacitance of the capacitor.
[2.9 pF]
2. 2.2 F capac
(The Rolling Yo-Yo)
A yo-yo has an inner radius of 0.5 cm, an outer radius of 3 cm, a mass of 0.5 kg,
and a moment of inertia of 1.85 kg cm2 about an axis through its center. We saw in
class that the yo-yo will roll to the right regardless of whether the
You should know the answers to the following questions and know how to do the
following tasks:
1. Find the total power emitted by an object using Stefans Law or find the total
power absorbed by an object from its surroundings. Find the peak wavelength in
You should know how to do the following:
1. Know the free-space wavelength range of the visible spectrum.
2. Use the Law of Reflection and Snells Law at an interface between two media.
Find the critical angle and understand what happens in TIR.
3. Tell if
You should know how to do the following:
1. Be able to sketch the field lines for a bar magnet.
2. Find the direction of the magnetic field at points in space due to current flowing
in a straight wire (Field RHR #1). Recall that the size of the field is d
1) A wheel starts from rest and speeds up uniformly to an angular speed of 12
rad/s in 3 s. Find (a) the angular acceleration and (b) the number of revolutions
made during this 3 seconds.
2) A wheel 2 meters in diameter lies in a vertical plane and is at
(2-D projectile motion)
You are on the roof of a building that is 150 m tall armed with a tennis ball
launcher that fires tennis balls with a speed of 35 m/s. Another building is 100 m
away from your building. You are trying to fire a tennis ball into a w
(Uniform Circular Motion)
An old "45" record has a radius of approximately 8 cm and rotates on a turntable at
45 rpm (revolutions per minute).
(a) If a penny is placed on the outer edge of the record, find the following
quantities for the penny: angular s
1) A model airplane with a mass of 750 grams is tethered by a wire so that it flies
in a circle with a diameter of 60 m. Its engine provides a force of 0.8 N
directed perpendicular to the wire. Estimate the torque provided to the plane
about the center of
1A. (Vectors)
(a) You are at position A. Position B is 50 m from A along the positive x-axis. You
walk 30 m at 30. Find the displacement vector that will put you at position B.
Express the vector in polar form.
(b) Now suppose that there is a wall between
1) A cylinder of mass 19 kg is rolling along at 10 m/s. Find (a) its translational
kinetic energy, (b) its rotational kinetic energy about its center of mass, and (c)
its total kinetic energy.
2) (a) Consider a uniform solid disk rolling down an incline w
.(Nonconstant Forces - Iteration of Newton's 2nd Law for Mass on Spring)
A 380 gram ball hangs from a spring with a spring constant of 15 N/m. The ball is
pulled down 10 cm from its equilibrium position and released. You are to find the
position of the ba
(Work-Energy Theorem vs. Equations of Motion)
A 50 kg bobsled, initially moving forward at 0.4 m/s, is pushed over a distance of
10 m with a constant force of 100 N. The coefficient of kinetic friction between
the sled runners and the ice is 0.08.
(a) Fin
(Frictional Force at the Drag Races)
A top fuel dragster can reach a speed of over 310 mph at the end of a quarter mile
track in a little under 5 seconds. However, the acceleration is not constant over the
entire race. The acceleration starts out very lar
(Geostationary Satellite)
(a) The latitude of Memphis is approximately 35. Find the tangential speed of our
classroom due to the spinning of the Earth. The Earth's radius is 6380 km.
(b) Find the tangential speed in m/s that we would be traveling if our c
4. (a) VB VA = U/q = W/(e) = (3.94 1019 J)/(1.60 1019 C) = 2.46 V. (b) VC VA = VB VA = 2.46 V. (c) VC VB = 0 (Since C and B are on the same equipotential line).