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To fit a contact lens to a patient's eye, a keratometer can be used to measure the curvature of the cornea-the front surface of the eye. This instrument places an illuminated object of known size at a known distance p from the cornea, which then reflects some light from the object, forming an image of it. The magnification M of the image is measured by using a small viewing telescope that allows a comparison of the image formed by the cornea with a second calibrated image projected into the field of view by a prism arrangement. Determine the radius of curvature of the cornea when p = 29.0 cm and M =0.0110.
A water tower, vented to the atmosphere, is drained by a pipe that extends to the ground. what is the absolute pressure in the drain pipe at ground level
A steel cable has a cross-sectional area 3.44 × 10-3 m2 and is kept under a tension of 3.33 × 104 N. The density of steel is 7860 kg/m3. Note that this value is not the linear density of the cable. At what speed does a transverse wave move along t..
a small ball bearing is illuminated with blue light from an argon ion laser (4880 A.) What is the diameter of the ball bearing
A person looks horizontally at the edge of a swimming pool. If its length is 5.00m, and the pool is filled to the surface, to what depth (in m) could observer see? For water is 1.33).
Co-60 is often used as a radiation source in medicine. It has a half-life of 5.25 years. How long, after a new sample is delivered, would the activity have decreased to about 1/3 its original value.
A proton is fired directly into a uniform electric field that is able to bring the charge momen- tarily to rest. How much work does the electric field do in stopping the proton
What minimum force requires for door to hold it open
A roller-coaster car has a mass of 1170 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 20 m, its speed is not changing.
Two particles of masses m1 and m2 are joined by a massless spring of natural length L and force constant k. Find the positions of the two masses at any subsequent time t
When chasing a hare along a flat stretch of ground, a greyhound leaps into the air at a speed of 14.0 m/s, at an angle of 30.0° above the horizontal. What is the range of his leap
A professor's office door is 0.96m wide, 2.2mhigh, 4.0cm thick; has a mass of 26kg , and pivots on frictionless hinges. what is its angular acceleration immediately afterward
Julie drives 100 mi to grandmother's house. On the way, Julie drives half the distance at 40 mph, How long does the return trip take
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