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Miller Physics Praxis Study > Physics Praxis > Flashcards

Physics Praxis Flashcards

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1
Q

What equation lets you determine the magnification of an image with a lens or mirror?

A
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2
Q

How is the focal point for a lens/mirror related to the distances for the object and the image?

A

The lens equation.

do is the distance for the object from the lens.

di is the distance for the image from the lens

f is the focal point for the lens/mirror.

A positive f indicated a converging lense and negative f indicates a diverging lens

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3
Q

Why does the sky apear blue?

A

When light strikes the atmosphere from the sun it is scattered by the molucules. Short wavelength (blue) light is scattered the most. Long wavelength (red) is scattered the least. Everything longer then blue is not scattered enough for you to see since it just continues straight(ish)

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4
Q

How do you calculate the vector cross product?

A

The mag(A) *mag(B) * sin(theta). It gives the value of a third vector that is orthogonal to the plane of the first 2 vectors.

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5
Q

What is the equation of position for SHM?

A

X=Asin(wt+phi)

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6
Q

How to calculate angular freq for SHM

A

w=sqrt(k/m)

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7
Q

What is kepler’s First Law?

A

The Law of Orbits: All planets move in elliptical orbits, with the sun at one focus.

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8
Q

What is Kepler’s Second Law?

A

The Law of Areas: A line that connects a planet to the sun sweeps out equal areas in equal times.

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9
Q

What is Kepler’s third Law?

A

The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.

Combine Centripetal force and Universal Gravitation for derivation

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10
Q

What is Pascal’s Law?

A

Pascal’s principle is defined as

A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.

This principle is stated mathematically as:

deltaPressure=density*gravity*deltah

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11
Q

What is Archimedes principle?

A

Any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body. The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid or to that fraction of the volume below the surface for an object partially submerged in a liquid. The weight of the displaced portion of the fluid is equivalent to the magnitude of the buoyant force.

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12
Q

How do you find the electric potential between 2 point charges?

A

Electric potential for a point charge is V=(k*Q)/r

It is a scalar quantity.
Include the sign of the charge with the equation.

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13
Q

What is capacitance?

A

How much charge per Volt can be stored either in a conductor or shared between two conducting surfaces. its unit is the Farad or Coulombs per volt.

C=Q/V

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14
Q

What does adding a dielectric do to a capacitor?

A

A dielectric will increase the capacitance. Some of the E field is consumed by the charges near to the conductors then they were before. With no battery this results in a drop in the voltage between the plate. With a batter this allows additional charge to be stored on the plates.

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15
Q

How do you calculate the capacitance of capacitors in series?

A

Capacitors in series act like resistors in parallel in terms of capacitance.

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16
Q

What is the Lorentz Force Law?

A

F=qE * qv*bsin(theta)

17
Q

What is bernoulli’s Principle?

A

It is a statement about conservation of energy per unit volume.

P+1/2(density)v^2+(density)gh=constant

18
Q

What is the first law of thermodynamics?

A

Another formulation of conservation of energy. For an isolated system deltaU = Q-W

Where DeltaU is the change in internal energy of the system, Q is the heat supplied to the system and W is the work done by the system on its surroundings.

19
Q

What is the second law of thermodynamics

A

The total entropy of an isolated system can never decrease over time. It can remain constant in ideal cases where the system is in a steady state.

Its practical application states that there is no such thing as a perfect heat engine. You can never use all the heat from a reservoir to do work. Some heat will be transfered to a cooler reservoir thus it is impossible to have 100% effeciecy for an engine.

20
Q

What does Adiabatic Mean?

A

A process where no heat is gained or lost by the system.

21
Q

What is the conversion from kelvin to Celcius?

A

-273.15 degrees C

22
Q

What is the carnot Cycle?

A

It is a hypothetical cycle of an ideal heat engine.

An engine is at some PV state A, The engine does some work while expanding at a constant Temp while being given heat the pressure decreases and the volume increases. This brings it to state B. The system continues doing work but without the heat reservour. The system’s temperature decreases and the system reaches state C. Work is then done on the system with a cold reservoir removing heat from the system has the volume decreases and the pressure increases. to state D. Finally work continues to be done without the cold reservoir causing the temp to increase and to bring the system back to state A.

23
Q

What is the third law of thermodynamics?

A

The entropy of a perfect crystal at absolute zero is exactly equal to zero.

24
Q

What is the Zeroth law of thermodynamics?

A

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other. Accordingly, thermal equilibrium between systems is a transitive relation.

25
Q

How do you determine apparent depth?

A

The apparent depth of an object is related to the ratio of the index of refraction

dapparent/d = Nabove/Nbelow

26
Q

What is the heat of vapoization for water?

A

2260J/g

27
Q

What is the specific heat of water?

A

4.184J/gdegC

28
Q
A

Miller Physics Praxis Study (1 decks)

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