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2 If you hold a typical pair of glasses over a table, with overhead lighting, the lenses produce a shadow on the surface. Why should clear lenses produce a shadow?
5 . A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light. Where are the lens and mirror positioned?
6. A professor is trying to quickly estimate the focal length of a 2.5 cm diameter biconvex lens. He takes the lens and finds the image of the overhead ceiling lights on his table to be 3 cm below the lens, so he estimates the focal length as about 3 cm. His student objects that at the focus there should be NO image formed, so this must be wrong. Why can the prof make this approximation successfully?
A mail bag with a mass of 124 kgis suspended by a vertical rope 8.0 mlong. How much work is done by the worker in moving the bag to thisposition
When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 6.75 10-7 m, What is the maximum acceleration of the eardrum
Three identical blocks are stacked with each extending as far aspossible over the block beneath it. Find the distance Dthat the top block overhangs the bottom block if the length of eachblock is 34.6 cm.
A series RCL circuit has a resonant frequency of 750 kHz, what is the value of the inductance?
A bowling ball (I=(2/5)mr2) is rolling up a track without slipping. Determine the balls velocity when it is 2.6 meter above the ground
a c-glass filament reinforced epoxy composite contains 65 vol filaments and has a density of 2.24 mgm3. if the c-glass
An old-fashioned single-play vinyl record rotates on a turntable at 45.0 rpm. What are (a) the angular velocity in rad/s and (b) the period of the motion?
The driver of a 1350 kg car, initially traveling at 12.1 m/s, applies the brakes, bringing the car to rest in a distance of 19.5 m. Find the net work done on the car
A sailboat is traveling east at 5.5 m/s. A sudden gust of wind gives the boat acceleration (0.60 m/s2, 40 degree north of east). Find the boat speed and direction 6.0 second later
a 9-v battery is connected across a capacitor of 20 microf through a switch which is initially open. the amount of
One student playing an instrument with a frequency of 256 Hz, noticed a beat frequency of 10 Hz between himself and another student from a distance also playing an instrument with a frequency of 256 Hz. The second student was approaching the first..
What is the minimum cross-sectional area required of a verticalsteel cable from which is suspended a 327kg chandelier, If the cable is 7.3 m long, how much does it elongate
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