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A woman can read the large print in a newspaper only when it is at a distance of 65 cm or more from her eyes.
(a) Is she nearsighted (myopic) or farsighted (hyperopic), and what kind of lens is used in her glasses to correct her eyesight?
(b) What should be the refractive power (in diopters) of her glasses (worn 2.7 cm from the eyes), so she can read the newspaper at a distance of 20 cm from the eyes?
A 25 horsepower motor consumes 21 kW of electricity, Calculate the heat loss of the motor (kW) and Calculate the efficiency of the motor
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The pulley in the illustration is a uniform disk of mass 2.8 kg and radius 0.24 m, which is free to rotate without friction. What is the acceleration of the falling block
A good model for a radio antenna is a dipole. P1 is on the perpendicular bisector of the dipole, and P2 is along the axis of the dipole in the direction of dipole vector ˆp. P1 and P2 are both a distance 100m from the center of the dipole.
Mars has a mass of 6.4*10^23 kg and radius of 3,400,000 m. find the acceleration due to the gravity on Mars
An inductor in the form of a solenoid contains 410 turns and is 12.0 cm in length. What is the radius of the solenoid
What is the force of gravity on the satellite if it moves towards Earth so its distance is now one half the original distance and
how high above the target must the rifle barrel be pointed.
An object has a kinetic energy of 257J and a momentum of magnitude 21.8 kg·m/s. Find out the speed and the mass of the object.
Suppose a formula for gain in heat energy of an object is H = m(A - B), where m = mass and (A - B) is its rise in temperature between A degrees and B degrees (as in #4). Write an expression for the absolute uncertainty, delta-H, in terms of m, del..
what is the speed of the proton in the beam.define the spread in these values.
At a factory, a noon whistle is sounding with a frequency of 480-Hz. As a car travelling at 79 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory.
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