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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 36 cm and 187 cm away from her eyes. Bifocal lenses are used to correct her vision. What power lens (in diopters) should be used in the top half of the lens to allow her to clearly see distant objects?
A grating has 380 rulings/mm and is 6.2 mm wide. How many higher orders of maxima can be seen
An electron is accelerated to a speed where its total energy is 209 times larger than its rest energy. What is the speed of the electron in terms of the speed of light
A pinada, practically in a shape of a slender thin rod of length mass 4.0 kg is hanging from the tree branch after being hinged at one end. Estimate how high the pinada will swing
you're helping with an experiment in which a vertical cylinder will rotate about its axis by a very small angle. you need to devise a way to measure this angle. you decide to use what is called an optical lever. How many degrees has the cylinder ro..
Considering Wiener's experiment (fig. 7.14) in monochromaticlight of wavelength 550nm, determine the number of bright bands per centimeter that will appear on it
Suppose that a particle accelerator is used to move two beams of particles in opposite directions. what is the magnitude of the average current in this region
A wire loop of radius 0.1 m has a 2-ohm resistance. A uniform magnetic field perpendicular to the plane of the loop increases from zero to 2 T in 0.01 s
A transverse traveling wave on a cord is represented by D = 0.25 sin (6.8x + 28t) where D and x are in meters and t is in seconds. find maximum and minimum speeds of particles of the cord
A thermodynamic system is operated at a constant pressure of 2 atm. Initially the volume of the system is 1m3. How much work is done by the system
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
At an outdoor market, a bunch of bananas is set into oscillatory motion with an amplitude of 26.93 cm on a spring with a spring constant of 10.7167 N/m. What is the weight of the bananas
A particle leaves the origin with an initial velocityof 2.37 m/s in the x direction, and moves with constantacceleration ax = -1.73 m/s2 and y = 3.20 m/s2. What is the particle's velocity at this time
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