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19 Cards in this Set
- Front
- Back
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What happens to a ray of light when it goes from air to a more dense medium?
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It's speed and wavelength change
Frequency does not change in a new medium |
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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. |
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If a sound is reduced by an intensity of 20dB's, what factor of intensity does it decrease by?
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intensity
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For a block on an incline plane, what is the force parallel to the incline (pulling the block down
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F = mg sin (θ)
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If a block on an incline plane at angle θ is not moving, what is the μs (static coff)?
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μs ≥ tan θ
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What is constant while in uniform circular motion:
Speed? Velocity? |
Speed is constant
Velocity is changing direction, hence no constant |
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Give eqn for centripetal acceleration
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centripetal acceleration
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Define centripetal force
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Sum of Ft in string and gravity, not a new force
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Give eqn for rotational momentum
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rotational momentum
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Give eqn for torque relating it to rotational acceleration
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rotational acceleration
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What is impulse (J)?
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Change in momentum
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What are the 3 different types of heat transfer?
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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 |
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What is the density of water?
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1g/cm^3
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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 |
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Give eqn for flow rate (Q)
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Flow rate
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Describe the force that drives capillary action up a tube? Give eqn of the force
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Surface tension. Force that resists changes surface distortion
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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 |
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What is the 1st harmonic of a wave with wavelength X in a closed tube?
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1/2 wavelength.
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What is the definition of n (like in Snell's Law) in optics?
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n = c / v speed
its the speed of light / v of light in medium |
