1- what is the relationship between integrity and necessity of enforcement ?
2- what is the relationship between external auditing and window-dressing?
3- At what stage in the design process should prototyping take place? why is prototyping done?
4- Why might design trade-offs be made? Give an example
Essay
1- Do society, employers and employees have shared interests?
2- Are there personal cost involved when one blows the whistle ? and should an individual ever consider doing it despite these consequences?
3- Should there be limits to how far we should go to ensure safety or preserve lives?
In: Physics
There is a tree in the middle of your front yard and you take pictures of a squirrel as it runs around the tree. When you take the first picture, the squirrel is 12.0 m away from the tree in the direction 30.0◦ N of E. Twenty seconds later, you take a second picture of the squirrel when it is 7.50 m away from the tree in the direction 15.0◦ E of S. What is the magnitude and direction of the average velocity of the squirrel between the two pictures?
In: Physics
Check all the correct statements.
| The internal energy of an ideal gas (those that obey PV = nRT) depends only the temperature of the system. |
| The internal energy of any gas depends only the temperature of the system. |
| The heat capacity of an ideal gas does not depend on what molecules the gas is made of. |
| At constant temperature, the internal energy of a real gas increases with increasing pressure because molecules are closer together. We assume that the conditions are such that attractions dominate over repulsions (i.e. the pressure values are not too high) |
| At constant temperature, the internal energy of a real gas decreases with increasing pressure because molecules are closer together. We assume that the conditions are such that attractions dominate over repulsions (i.e. the pressure values are not too high) |
| A cyclic path (initial state = final state) always results in ∆U = 0 |
| ∆U = 0 for any process that does not result in a change in temperature. |
| ΔU= qv only for a monoatomic ideal gas |
In: Physics
A particle of mass m moves under the influence of gravity g on the inner surface of a smooth cone of half-angle α. The axis of the cone is vertical, with its vertex downward. (a) Find the equation(s) of constraint of the system. (b) Find Lagrange’s equations of motion using the method of undetermined multipliers. (c) Determine the condition on the angular velocity ω such that the particle can describe a horizontal circle at a height h above the vertex.
In: Physics
a) In the wave picture of light, what determines the following properties? i. Color of the light ii. Brightness/intensity of the light iii. Energy of the light
b) In the photon picture of light, what determines the following properties? i. Color of the light ii. Brightness/intensity of the light iii. Energy of the light
In: Physics
1. Think about the forces acting on a train engine and the train
cars that it pulls.
a.) Draw a force diagram for the 5 forces (one of the forces is
friction) acting on the engine as it accelerates forward along the
rails.
b.) Draw a force diagram for the 4 forces acting on a train car as
it is pulled by the accelerating engine.
c.) By Newton’s 3rd Law, the train car pulls backward on its engine
exactly as hard as the engine pulls forward on the train car. Since
Newton’s 3rd Law is correct, the force by the engine on the car
should be equal and opposite to the force by the car on the engine.
Therefore, the entire train shouldn’t go anywhere. Using your force
diagrams from parts (a) and (b) above, explain why this analysis is
wrong. That is, show that there is a net force on the engine and
the train car.
In: Physics
a) Draw the energy levels (including the Fermi levels) of a non-degenerate p-n junction with a reverse bias of Vr. Draw the hole and electron concentrations as well. b) If this pn junction is used as a photodetector, what is the threshold wavelength of this detector? Will lower or higher wavelengths be detected by this detector?
In: Physics
A car of mass M and a small truck of mass 3M are travelling along two roads perpendicular to each other as shown.The car and the truck collide at the intersection at O.
The speed of the truck just before collision is VT =15.0m/s. Immediately after the collision, the wreckage moves as a single mass with Vf =12.0m/s as shown.
Using conservation of momentum:
[a] Find the value (in degrees) of θ?
A car of mass M and a small truck of mass 3M are travelling along two roads perpendicular to each other as shown.The car and the truck collide at the intersection at O.
The speed of the truck just before collision is VT =15.0m/s. Immediately after the collision, the wreckage moves as a single mass with Vf =12.0m/s as shown.
[b] What is Vc, the speed (in m/s)of the car just before collision?
In: Physics
Show by direct computation that the impulse momentum theorem and the work-energy theorem are invariant under the Galilean transformation.
In: Physics
Astronomers have discovered a new planet around a nearby Sun-like star. The following data on the planet is known. It has a density of 1.4 relative to water along with a mass of 7.8×1027 kg and a radius of 77,000 km, and its orbital period is 0.52 years.
a) From this information determine the following: the mass and radius of the planet relative to Earth, semi-major axis of the planet’s orbit, as well as the mass of the host star. (Note: To find the relative value of any quantity take a ratio of the new value to the comparison value, for example in this case the comparison values are Earth’s)
b) From the information given and derived in part a), determine what type of planet this new discovery is and in which part of its solar system it lives.
c) Given what we discussed in class about planetary atmospheres,
predict what kind of atmosphere this planet will have.
In: Physics
You (mass 81 kg) and your friend (mass unknown) are in a rowboat (mass 65 kg) on a calm lake. You are at the center of the boat rowing and she is at the back, 2 m from the center. You get tired and stop rowing. She offers to row and after the boat comes to rest, you change places. You notice that after changing places the boat has moved 20 cm relative to a fixed log. What is your friend's mass? (Note that there are two possible solutions. Provide both.)
In: Physics
A block of mass M = 4.0kg is released from rest at point A as shown. Part AB of the track is frictionless and is one quarter of a circle of radius R=1.25m. The horizontal part of the track BC is rough with co-efficient of kinetic friction . The block comes to rest at C after moving a distance L = 6.25m. The block can be treated as a point particle.
[a] What is the speed (in m/s) of M at B?
A block of mass M = 4.0kg is released from rest at point A as shown. Part AB of the track is frictionless and is one quarter of a circle of radius R=1.25m. The horizontal part of the track BC is rough with co-efficient of kinetic friction . The block comes to rest at C after moving a distance L = 6.25m. The block can be treated as a point particle.
[b] What is the value of μk?
In: Physics
Two colors of light, green and yellow, undergoes diffraction through the same diffraction grating. Which color of light sees greater diffraction angle?
|
Both colors undergo the same diffraction angle. |
||
|
Green |
||
|
Yellow We will measure the spectra of helium, mercury and neon gas discharge tubes. True False |
Light is emitted when a valence electron moves from a lower state to an excited state.
True
False
Light produced from spontaneous emission is incoherent.
True
False
In: Physics
----Modern Physics question: Please be thorough with your explanation.
Using the Internet, find the location of a particle accelerator. In several paragraphs describe its size, what particles are being accelerated, how they are being accelerated, what their target is, how the particles are detected and what sub-atomic particles have been discovered at the site. Be sure to cite your sources.
In: Physics
physics 211:
a block is placed on an adjustable ramp and then the tilt of the ramp is increased slowly until the block begins to slide. why exactly does the block refuse to slide at some angles, but once the tilt is large enough it always slides down the ramp?
In: Physics