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A contact lens rest against the cornea of the eye. An optometrist uses a keratometer to measure the radius of curvature of the cornea, thereby ensuring that the prescribed lenses fit accurately. In the keratometer, light from an illuminated object reflects from the corneal surface, which could be consider a convex mirror in this case and forms an upright virtual image that is smaller than the object. For a patient, with an illuminated object placed 9 cm in front of the cornea, the magnification by the corneal surface is measured to be 0.046. Determine the radius of the cornea for this patient.
A 1.35 kilogram block of wood sits at the edge of a table, 0.782 meter above the floor. Find what horizontal distance does the block cover before hitting the ground
A 11.0 kilogram box is being pushed from the bottom to the top of a frictionless ramp. Find how much work is done by the pushing force
A cement block accidienatlly falls from rest from the ledge of a 63.7 -m-high building when the block is 18.2m above the ground a man 2.00m tall looks up notices that the block is directly above him
in a standing wave pattern the distance between the second and the seventh nodes is 5cm. if the frequency is 300 hz
A non-conducting, infinitely long cylinder of radius R lies along the z-axis. Find what is the magnetic field on the z-axis
A light beam coming from an underwater spotlight exits the water at an angle of 58° to the vertical. At what angle of occurrence did it hit the air-water interface from below the surface?
Find the work required to move a planet satellite of mass 1890 kilogram from a circular orbit of radius 2R to one of radius 3R, where 3.95 x 106 meter is the radius of the planet
The elementary particle called a muon is unstable and decays after 2.20 ?s, as observed in its rest frame, What lifetime do you observe for the muon
You use an elevator to travel from the first floor (h = 0) to the fifteenth floor of a building (h = 45 m). what is the work done by gravity on you
life scientists use ultracentrifuges to separate biological components or to remove molecules from suspension. samples
A person can be killed if a current as small as 50 mA passes near the heart. An electrician is working on a humid day with hands damp from perspiration. What potential difference between the two wires
Lead pellets, mass of each is 0.80 gram is heated to 200°C. Find how many pellets must be added to 480 gram of water that is initially at 20°C to make the equilibrium temperature 25°C
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