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A farsighted librarian wears her 3.99-D refractive power eyeglasses 0.0280 m from her eyes and is able to read books held no closer than 0.294 m from her eyes. As a matter of convenience, she decides to switch to contacts. Determine the refractive power for her contact lens prescription.
An electric vehicle starts from rest and accelerates at a rate of 1.6 m/s2 in a straight line until it reaches a speed of 20 m/s. The vehicle after that slows at a constant rate of 1.4 m/s2 until it stops. (1) How much time elapses from start to s..
A small but measurable current of 7.70 E-10 A. exists in a copper wire whose diameter is 0.05 cm. Calculate the electron drift speed (in meters/second)
A spaceship travels toward the Earth at a speed of 0.97c. The occupants of the ship are standing with their torsos parallel to the direction of travel. What are the occupants' width according to others on the spaceship
There is a 400 m wide river that flows west to east at 30.0m/min. Your boat moves at 100 m/min relative to the water no matter which direction you point it. Where on the other side of the river (north side) do you land if you point your boat perpendi..
The space shuttle needs to slow down in order to return from its orbit. It does so by reversing direction and firing its 3 main engines for a short amount of time. The mass of the space shuttle is 2.0 x 106 kg and has an orbital speed of 8000 m/s. Th..
Suppose the car on the 30 degree angle accelerating up and down theincline. How would this affect the experimental determinations from no acceleration?
A person with a mass of 71.6 kg and a volume of 0.089 m3 floats quietly in water. (a) What is the volume of the person that is above the water? If an upward force F is applied to the person, the volume of the person above the water increases by 0...
A direction perpendicular to this initial direction
three particles of charge q are at the corners of an equilateral triangle of side length a.a at what point if any in
Three equal point charges, each with charge 1.35 mu C, are located at the vertices of an equilateral triangle whose sides are of length 0.60m. What is an electric potential energy U of the system? (Take as zero the potential energy of the three ch..
an aerosol can is pressured at 440kpa when its refrigerated at 3 degree celsius. the can warns against temperatures in
A projected electric vehicle makes use of storage batteries as its source of energy. how many kilometers must the batteries be recharged
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