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Determine the strength of a lens needed to allow a person with a far-sighted eye with a near point of Pnar= 2.0 m (near point means the closest distance for which an object can be imaged on the retina) to read comfortably at 0.25 m?
a) If an emmetrope has an accommodation of 53 D, what is the person's near point?
b) If a former emmetrope wears reading glasses of +2D to read at a distance of 25 cm, what is the near point without glasses?
a plank of mass m and length L is attached to a wall at one end, What is the magnitude of the force f exerted on the plank by the wall in terms of D, m, L
A sample of gas (? = 1.5) is taken through an adiabatic process in which the volume is compressed form 1600 cc to 400 cc. If the initial pressure is 150 KPa, what is the final pressure? How much work is completed on the gas in process.
A billiard ball moving at 5 m/s strikes a stationary ball of the same mass. After the collision, find the struck ball's velocity (magnitude and direction) after the collision
An object acted on by three forces moves with constant velocity. Find the magnitude of the third force acting on the object
A 5kg block rests on an incline plane thathas a slope angle of 25 degrees. What is the magnitude of the frictional force
The amount of charge that passes through the filament of a certain lightbulb in 2.00 s is 1.67C. find the current in the lightbulb
Two small stereo speakers are 3 m apart and act as a double slit interference experiment with sound waves. If the opposite wall of the room is 5.5 m away and the sound frequency is 4 kHz, what is the distance between the two interference maxima ne..
For most standard cosmologies other than deSitter the scale factor varies as t^n, with n
Consider a parallel plate capacitor composed of two very large (approximate as infinite) square plates, What is the distance between the plates
the uniform electric field between the two plates of a capacitor is 120 n and the potential difference between plates
The average output power of a cellular phone, which can be treated as a point of E-M waves, is 1.0W when it is "ON". Estimate the intensity of the phone's E-M waves in your brain
How much heat would flow by the glass in 1.00 h if there is a temperature difference of 3^circ {rm C} between the inner and outer surfaces.
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