UMass Amherst PHYSICS 132 - 132 final guide (2 pages)
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- School:
- University of Massachusetts Amherst
- Course:
- Physics 132 - Intro Physics II
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1kHz 1000Hz e 1 6E 19 Hz kHz 1000 1 cm 01 m Hz mHz 1000000 1 A 1000mA Speed v c n Magnification q p 75 50 1 5e Time taken d v c 3E8 m s A hydrogen nucleus e is situated left of a carbon nucleus 6e The d thickness electric force experienced by H is equal to the left and the Ex dg 5 cm thick layer of oil n 1 46 wedged between dg 1 cm thick magnitude is equal to the force exerted on C sheet of glass n 1 5 and dp 2 cm thick sheet of polystyrene n 1 59 How long does it take the light Which represents the net force Vg 3E8 1 5 2E8 B tg 01m 2E8 050E 9 Seconds V0 3E8 1 46 2 05E8 TO 05 2 05E8 243E 9 s Vp 3E8 1 59 1 8867E8 Tp 02 1 8867E9 1060E 9 05ns 2433ns 1060 ns 399ns Wavelength 2 n d m or m 05 m 1 for thinnest sheet d thickness c Wavelength frequency If two objects are electrically attached to each other the Objects could be electrically neutral Compared to the average speed in the air the average speed of a A plastic rod is charged up and brought to a neutral sphere After beam of light in glass is less they separate the rod is repelled by the sphere Electromagnetic waves can travel through either a medium or a vacuum Colors seen when gasoline forms a thin film in water are an example of interference The critical angle for a transparent material is the angel at and beyond all light within the material is reflected Critical angle is less in a diamond Snell s Law n1sin n2sin Virtual Upright and small Real Flipped Forces are equal How many electrons are needed to produce 1 0 of negative charge e 1 60 1 1 e 1 1 1 60 6 3E18 Position of an image 1 do 1 di 1 f f Focal length do object position di Image position Sin n1 n2 F1 kq1q2 r 2 Ex The index of refraction of the core of a piece of fiber optics cable q 6 7 Nc K 1 4piE0 9 0E9 is 1 72 Surrounding 1 41 What is the critical angle Sin 1 47 1 72 Angle 58 7 Slit spacing Wavelength distance to screen distance between fridges Bright bands 1 2 3 4 Dark Bands 1 5 2 5 3 5 4 5 Distance from central spot to nth order fridge m L R d L wavelength R distance from slit to screen dsin m L 9 0E9 6 7E 9 2E 9 01m 2 1 206E 3 F1 F2 Fnet F1 cos 30 F2 cos 30 2 088E 3N E kQsource r 2 An erect object is 50cm from a concave mirror of radius 60 cm In If you were to cut up a small permanent magnet bar in half each piece this situation the character of the image is would be a magnet with a north and south pole 1 30 1 50 1 q q 75 Since q is positive image is real 1kHz 1000Hz e 1 6E 19 Hz kHz 1000 1 cm 01 m Hz mHz 1000000 1 A 1000mA Steady flux There is no induced magnetic field An electron is moving to the right encounters a uniform magnetic field Lenz s law states that when an emf is generated by a change in pointing out of the page magnetic flux according to Faraday s Law the polarity of the E would move up induced emf is such that it produces an current that s magnetic field opposes the change which produces it 1 Charge Positive negative and neutral charges a Units Coulombs 2 Current I Q t a Amount of charge that travels in a given time b Unit Amp Coulomb sec 3 Voltage Energy per unit charge a Unit Volts Joules Coulomb 4 Resistor Resistance a Units Ohms 5 Power Ohm s Law A charged particle that is moving in a static uniform magnetic field V I R may experience a magnetic force but its speed wont change Combinations 1 Series Two resistors side by side An electron moving west enters a magnetic field Because of this Will have effective resistance R1 R2 effective field the electron curves upward We may conclude that the magnetic 2 Parallel Two resistors parallel to one another field must have a component towards the north 1 R effective 1 R1 1 R2 Current passes through a solution of sodium chloride In 1 00 second 2 68 1016Na ions arrive at the negative electrode and 3 92 1016Cl ions arrive at the positive electrode Change in Na ions q ne 2 6E16 1 69E 19 4 288E 3C Change in Cl ions q n e 3 92E16 1 69E 19 6 272E 3 Current i q1 t q2 t 10 56E 3 A 10 56mA Charge q i t I current t time Electrons flow n q e A 3 0 V battery powers a flashlight bulb that has a resistance of 6 0 O How much charge moves through the battery in 10 min Voltage V 3 0 V Resistance R 6 0 Ohm Current I V R 3 6 0 5 A Current charge flow time Charge Flow current time 0 5 10 60 As 10 minutes is 10 60 seconds Two equal and opposite charges are a small distance apart forming an electric dipole A positive charge q is placed above these charges as shown in the 300 C figure equidistant from both of them Which diagram below best gives the What is the voltage of a battery that will charge a 4 0 uc direction of the net force the dipole exerts on the charge q capacitor to 60 uc Q CV V Q C 60 0 uC 4 0 uF 15 V Increasing flux The induced magnetic field points opposite the Q Charge C Capacticity V volts applied magnetic field Work done q V1 V2 C eoA d eo 8 85E 12 Decreasing flux The induced magnetic field points in the same direction as the applied magnetic field
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Study Guide: Midterm 2
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