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A nearsighted person cannot see objects clearly beyound 30cm(the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens to correct the patients vision?
a runoff for a truck consists of aa 500 meter horizontal runway with course gravel to stop the truck. the mass of the
A 40.0 kg wagon is towed up a hill inclined at 17.3° with respect to the horizontal. How fast is the wagon going after moving 80 m up the hill
jamie is playing tennis. a 0.057kg ball is coming towards her at a velocity of -14 ms. after she hits it in the exact
An ac power generator produces 50 A (rms) at 3600 V. The voltage is stepped up to 100 000 V by an ideal transformer and the energy is transmitted through a long distance power line which has a resistance of 100 ohms. What percentage of the power deli..
He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633nm, What is the average energy density in the laser beam
A pair of eyeglass frames is made of epoxy plastic. At roomtemperature (assume 20 C), the frames have circular lensholes 1.53 cm in radius. To what temperature must the frames beheated in order to insert lenses 1.55 cm in radius?
Two titanium spheres approach each other head-on with the same speed and collide elastically. What is the mass of the other sphere
An airplane is dropping bales of hay to cattle stranded in a blizzard on the Great Plains. The pilot releases the bales at 140m above the level ground when the plane is flying at 80.0m/s 45.0 degrees above the horizontal. How far in front of the catt..
Calculate the force on an airplane which has acquired a net charge of 1450?C and moves with a speed of 150m/s perpendicular to the Earth's magnetic field
When a converging lens is used in a camera (as in the top figure), the film must be at a distance of 0.210 m from the lens to record an image of an object that is 4.00 m from the lens. How far from the projector lens should the film be placed
Find out the tension of the right and left wire
A plane mirror and the concave mirror (f = 8.70 cm) are facing each other and are separated by a distance of 23.0 cm. An object is placed between the mirrors and is 11.5 cm from each mirror.
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