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One lens of a nearsighted person's eyeglasses has a focal length of -21.7 cm, and the lens is 1.70 cm from the eye. If the person switches to contact lenses that are placed directly on the eye, what should be the focal length of the corresponding contact lens?
A coffee filter of mass 1.5 grams dropped from a height of 2 m reaches the ground with a speed of 0.7 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? begin from the Energy Principle, and choose as the s..
You fill up your gas tank in Europe when the euro is worth $1.25 and gasoline costs 1.33 euros per liter. What is the cost of gasoline in dollars per gallon
When 195 g of a substance is heated to 335°C and then plunged into a 100 g aluminum calorimeter cup containing 134 g of water at 13.0°C, What is the specific heat of the substance
A 2.5 mm diameter copper wire carries a current of 33 A, uniformly distributed across its cross-section. Determine the magnetic field at the surface of the wire
Electric bees. As they fly through the air, honeybees can pick up a small amount of electric charge, Find the magnitude of the electric force on the bee in the electric field just above Earth's surface, 130N/C directed vertically downward
If the hypotenuse of a right triangle is 6.00cm long, and the opposite is 4.00. What is the angle facing the opposite
A layer of synthetic diamond is grown on a quartz substrate inside a vacuum chamber. What is the thickness t of the thin film of diamond
A hanging block A ( Ma = 15 kg) is connected by a light cable and a pulley wheel to a second block B ( Mb = 10 kg) situated at the bottom of a frictionless inclined plane with angle %u03B8 = 30o to the horizontal
A 4.00-kg particle moves along the x axis. Its position varies with time according to x = 3.0t + 2.0t^2 where x is in meters and t is in seconds. Find the acceleration of the particle
find the potential energy at each location below. How far from the point of the drop will the rock hit the ground.
In the "World's Strongest Man" competition, one event is to pull a 2370 kg truck for 5 m. What is the least amount of force
A diffraction grating produces a first order maximum at an angle of 20.0°. What is the angle of the second order maximum
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