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19 Cards in this Set

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What happens to a ray of light when it goes from air to a more dense medium?
It's speed and wavelength change

Frequency does not change in a new medium
Which type of electromagnetic wave is more readily absorbed:
long wavelengths or short wavelengths?

Would IR be absorbed at more than visible light?
Shorter wavelengths are more readily absorbed (hence an xray has high frequency and is absorbed by bone)

IR has a longer wavelength than visible light, so visible light is absorbed more.
If a sound is reduced by an intensity of 20dB's, what factor of intensity does it decrease by?
intensity
For a block on an incline plane, what is the force parallel to the incline (pulling the block down
F = mg sin (θ)
If a block on an incline plane at angle θ is not moving, what is the μs (static coff)?
μs ≥ tan θ
What is constant while in uniform circular motion:
Speed?

Velocity?
Speed is constant

Velocity is changing direction, hence no constant
Give eqn for centripetal acceleration
centripetal acceleration
Define centripetal force
Sum of Ft in string and gravity, not a new force
Give eqn for rotational momentum
rotational momentum
Give eqn for torque relating it to rotational acceleration
rotational acceleration
What is impulse (J)?
Change in momentum
What are the 3 different types of heat transfer?
Conduction: vibration of atoms transfered to neighbors

Convection: heat transfers to air, air becomes less dense, carries heat upwards

Radiation: sun rays travel across empty space to heat earth
What is the density of water?
1g/cm^3
How does each density react to changes in temp and pressure?

Give 2 eqns pertanint
Solids and liquids don't change much, thus their specific gravity doesn't change much

Gases however follow the eqns above
Give eqn for flow rate (Q)
Flow rate
Describe the force that drives capillary action up a tube? Give eqn of the force
Surface tension. Force that resists changes surface distortion
Can a magnetic field do work?

Can it change speed and direction?
No, it is always perpendicular to v

It can change speed and direction
What is the 1st harmonic of a wave with wavelength X in a closed tube?
1/2 wavelength.
What is the definition of n (like in Snell's Law) in optics?
n = c / v speed

its the speed of light / v of light in medium