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Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 38 cm and 199 cm away from his eyes. Bifocal lenses are used to correct his vision. What power lens (in diopters) should be used in the bottom half of the lens to allow him to clearly see objects 25 cm away?
A van travels at a constant speed around a circular track whose radius is 2.75 kilometer. Obtain the magnitude of the centripetal acceleration of the car
an ideal air conditioner operating on a carnot cycle absorbes heat q2 from a house at temperature t2 and discahrges q1
Two identical +9.5uC point charges are initially 3.5cm from each other. If they are released at the same instant from rest, hoe fast will each be moving when they are very far away from each other? suppose they have identical masse of 1mg.
a 1.0cm -tall candle flame is 2.0m from a wall. you happen to have a lens with a focal length of 42cm . a how many
A person is having trouble seeing. Bifocals must be prescribed for him. His far point is 78.0 cm, and his near point is 57.0 cm. What two lenses (with power in dioptres) must be prescribed to enable him to see clearly from a comfortable reading dista..
The barricade at the end of subway line has a large spring designed to compress 2.00 m when stopping a 1.00 x 10^5 kg train moving at 0,500 m/s. What speed would the train be going
Calculate the density of a solid substance if a cube measuring 3.62 cm on one side has a mass of 153 g. The answer has units of g/cm3
A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north of east. The magnetic meridian of the place happens to be 10° west of the geographic meridian. The earth's magnetic field at the location i..
a person traels by car from one city to another with different constant speeds between pairs of cities. she drives for
A soccer ball, which has a circumference of 70.0 , rolls 11.0 in 3.30. What was the average angular speed of the ball during this time
An iron anchor of density of 7870 kg/m^3 appears 200 N lighter in water then in air. Determine the weight of the anchor in air
a short bar magnet of magnetic moment m 0.32 j t-1 is placed in a uniform magnetic field of 0.15 t. if the bar is free
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