Suppose you put on two pairs of polarizing sunglasses with their axes at an angle of \(15.0^{\circ}\). How much longer will it take the light to deposit a given amount of energy in your eye compared with a single pair of sunglasses? Assume the lenses are clear except for their polarizing characteristics.
Text Transcription:
15.0 degrees
Some on test 2 notes GW1:block mass m1=10 at rest on rough horiz surface.Connected to hanging mass m2=15 by massless string across massless frictionless pulley.Speed of blocks after released and fallen d=1.5m if coeff btwn block 1 and surface is uk=0.5 Same question w angular speed of pulley Ex2) hoop w radius 0.5 and m=2.Rolls w/out slipping 1.5m down plane inclined at 30 deg above horiz.Speed of hoop at bottom Angular speed at bottom • KEtrans- if obj center of mass moving • KErot- if obj it rotating about its center of mass • Work done by constant force/torque. Usually cos180/0(+1,-1) • PEg-When height of center of mass moves (Peg=mgh) h in cm • Static eq- when all F=0(in x & y..Trans eq) andT=0 (torques) probs: ‣ 1) extended FBD ‣ 2) coordinate system & pivot ‣ 3) break f's into x & y components ‣ 4) set up ‣ 5) Calc mag & dir of torque about picot for each f acting on obj ‣ 6) set up ‣ 7) solve for unknowns • Ex1) fiver weighty 500N at end of dive board 4m and negligible mass.Board fixed or 2 pedestals separated by 1.5 m.Mag and dir of f on board by 2 pedestals Gw1) same board,diver,pedestals...Board mass is 200n Ex2) ladder 12m and 15kg leans against frictionless wall at 30 deg angle w wall.Mag of f on ladder from wall and ground (friction on ground or ladder would slide) PP1) a)78deg b)70deg Spring-and-mass system Gw1:mass attached to spring pulled away f
