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When a patient is being fitted with contact lenses, the curvature of the patient's cornea is measured with an instrument known as a keratometer. A lighted object is held near the eye, and the keratometer measures the magnification of the image formed by reflection from the front of the cornea. If an object is held 11.5 cm in front of a patient's eye, and the ratio of the height of the reflected image to that of the object is 0.025, what is the radius of curvature of the patient's cornea?
mm
The index of refraction for crown glass is 1.512 at a wavelength of 660 nm (red), whereas its index of refraction is 1.530, what is the angle of refraction for each wavelength
A series RCL circuit contains a 4.99-µF capacitor and a generator whose voltage is 11.6 V. At a resonant frequency of 1.20 kHz the power delivered to the circuit is 24.1 W. Find the value of the inductance
Susie is out fishing on a calm, sunny day. She hooks an old tire that is resting on the lake bottom, and hauls it into her boat
An air-core solenoid has a length of 27.1 cm, a cross-sectional area of 0.0454m2, By how much does the magnetic flux through the solenoid change
What is the energy density in the electric field at the surface of a 2.90-cm-diameter sphere charged to a potential of 1000V
A meterstick (L = 1 m) has a mass of m = 0.121 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. What is the tension in the left string?
A 0.250 block moving vertically upward collides with a light vertical spring and compresses it 4.00 before coming to rest. If the spring constant is 53.0 , what was the initial speed of the block? (Ignore energy losses to sound and other factors d..
You (height of your eyes above the water, 1.75) are standing 2.00 from the edge of a 2.50--deep swimming pool. You notice that you can barely see your cell phone, that went missing a few minutes before, on the bottom of the pool.
The particle then begins to move. Find out the speed of the alpha particle after it has moved through a potential difference of −3.45×10−3 V.
A tennis player swings her 1000g racket with a speed of 10m/s . She hits a 60g tennis ball that was approaching her at a speed of 21m/s. what is the average force that the racket exerts on the ball
The box is taken up a mountain where the air pressure outside the box is 8.00 104 Pa. The inside of the box is completely evacuated. Elucidate the magnitude of the force required to pull the lid off the box?
A long straight wire carries a current of 6.2 A. The wire is horizontal in the plane of the page (screen), Calculate the force that acts on the electron
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