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A stamp collector is viewing a stamp by a magnifying glass held next to her eye. Her near point is 25 cm from her eye.(a) What is the refractive power of a magnifying glass that has an angular magnification of 5.2 when the image of the stamp is located at the near point? (b) What is the angular magnification when the image of the stamp is 41 cm from the eye?
An electron is a subatomic particle (m = 9.11 10-31 kg) that is subject to electric forces. Find the magnitudes of the net force acting on the electron
The moon orbits the earth at a distance of 3.85 x 108 m. Assume that this distance is between the centers of the earth andthe moon and that the mass of the earth is 5.98 x 1024kg. Find the period for the moon's motion around the earth.
A horizontal conductor in a power line carries a current of5000 A from south to north. Earth'smagnetic field (60.0 µT) is directed toward the north and isinclined downward at 71° to the horizontal. Find the magnitude anddirection of the magnetic forc..
it is desired to measure the magnitude of field between the poles of a powerful loud speaker magnet. a small flat
You’re out at the park with some friends where there is an open-air concert. Standing 20. meters from the stage, the music is a agreeably loud 90. dB. After a while you all decide to move somewhere quieter where you can hear each other talk.
What is the mass of sculpture (in kg) assume that the local acceleration due to gravity is 9.80 m/s2.
A baseball is thrown from the roof of 21.1 m-tall building with an initial velocity of magnitude 11.6 m/s and directed at an angle of 53.9 above the horizontal. Use = 9.80 m/s^2. What is the speed of the ball just before it strikes the ground
A 10 kilogram mass and a 2 kilogram mass are connected by a light string over a mass less frictionless pulley. determine the acceleration of the system when released
The cord is after that pulled from below, shortening the radius of the circle in which block revolves to 0.15. Model the block as a particle.
A bob of mass m is suspended from a string of length L, forming a pendulum. The period of this pendulum is3.5 s. If the pendulum bob is replacedwith one of mass 1/3m and the length of the pendulum is increasedto 2L, what is the period of oscillation?
A car moving at 10 m/s encounters a bump that has a circular cross-section with a radius of 30 m. What is the normal force exerted by the seat of the car on a 60-kg passenger
The graphite in a pencil has a resistivity of7.84×10−6 W×m.The graphite's diameter is 0.700 mm and its length is40.0 mm. (a) Find the resistance of this graphite "wire."
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