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A farsighted eye is corrected by placing a converging lens in front of the eye. The lens will create a virtual image that is located at the near point (the closest an object can be and still be in focus) of the viewer when the object is held at a comfortable distance (usually taken to be 25.0 cm). If a person has a near point of 53.5 cm, what power reading glasses should be prescribed to treat this hyperopia? Assume that the distance from the eye to the lens is negligible.
Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-half the diameter of the wide section. what is the velocity of the fluid in the narrow section
protons in an accelerator at the fermi national laboratory near chicago are accelerated to a total energy that is 400
In an amusement-park ride, riders stand with their backs against the wall of a spinning vertical cylinder. Find the minimum number of revolutions per minute necessary
A vector has an x component of -27.5 units and a y component of 35.8 units. Find the magnitude and direction of this vector
You access the roof of a building and throw a ball to the ground with an initial velocity of 12.0 m/s at an angle of 25.0° below the horizontal. At what time does the ball hit the ground
There is a 'race' between a solid cylinder and a hollow cylinder over a distance of 2 m along a slope angled at π/6 with the horizontal. Both have a mass 1 kg and radius 30 cm. In case of the hollow cylinder, the inner radius is 20 cm. Which one will..
Part A. How close to the right edge of the 56 kg picnic table shown in the figure can a 81kg man stand without the table tipping over? Express your answer to two significant figures and include the appropriate units.
If a rocket's exhaust speed is 160 m/s relative to the rocket, what fraction of its initial mass must be ejected to increase the rocket's speed by 50 m/s
As a baseball is being caught, its speed goes from 25 to 0 m/s in 0.008 seconds. What is the force acting on the ball
Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to report the mass truthfully). How far apart are the half-kilogram marks on the scale
a parallel-plate air capacitor is made from two plates 0.25 m2 in area spaced 1.5 cm apart. it is connected to a 38 v
a. Draw a free body diagram for the combined passenger and chair. b. Develop an equation for the angle θif the motorized shaft rotates at a constant angular speed ω. Assume d and L are known constants.
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