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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 6-year-old girl standing on a toy chest throws a doll straight up with an c of 16 feet per second. the height h of
When a 0.20-kg mass is suspended from a vertically hanging spring, it stretches the spring from its original length of 3.0 cm to a total length of 7.0 cm. What is the maximum speed of the mass as it oscillates
An extension cord made of two wires of diameter 0.129 cm (no. 16 copper wire) and of length 2.7 m (9 ft) is connected to an electric heater which draws 11.5 A on a 120-V line
An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. If radar waves have a wavelength of 3.0 cm.
Eight books, each 4.3 cm thick with mass 1.7kg, lie flat on atable. How much work is required to stack them one on top of another
stiff wire bent into a semicircle of radius a is rotated at constant frequency f in a uniform magnetic field B, What is the amplitude of the emf
In a fluorescent tube of diameter 3 cm, 7 10^18 electrons and 1.75 10^18 positive ions (with a charge of +e) flow through a cross-sectional area each second, What is the current in the tube
What is the source of charge carriers moving in an electric circuit, and what is the role of the battery/source in that movement
Suppose a block with mass 2.80 kg is resting on a ramp. If the coefficient of static friction between the block and the ramp is 0.440, Find the maximum static friction force that acts on the block
A charge of 0.76 C is moved from a position where the electric potential is 6 V to where it is 59 V. What is the change in potential energy of the charge?
Light from a helium-neon laser is shines on a slit of width 0.02mm. Explain qualitatively the pattern of light seen on a screen 1.0 meter away. How would the pattern be dissimilar if the slit were 0.06mm wide instead of 0.02 mm?
A toy cannon uses a spring to project a 5.80 g projectile. The spring is originally compressed with 8.00 cm and has a force constant of 15.54 N/m. When the spring is released, the projectile slides 15.0cm during the barrel of the cannon where the bar..
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