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A rotating door is made from four rectangular sections, asindicated in the drawing. The mass of each section is 80 kg. A person pushes on the outer edge of onesection with a force of F = 77 Nthat is directed perpendicular to the section. Determine themagnitude of the door's angular acceleration.
When a bow and arrow are cocked, a force is applied to the string to pull it back. Is the energy of the system increased? Explain
If 100 physics students each give off 100 W as they sit in the classroom taking an exam, estimate the temperature increase of the room during the hour-long test
question a 2.1 kg body oscillates in shm on a spring that when extended 2.3 mm from its equilibrium position has an 10
The plates of a cathode ray tube are parallel and are 5 mm apart. What is the acceleration of the electron
The two blocks are on frictionless inclines and are in static equilibrium. The block on the left has a mass of 49 Kg, and the block on the right has a mass of n3 Kg. If the left incline has the length of n1 meters, and the right incline the length of..
The normal range of hearing is about 20 to 20000 Hz. Assume that your hearing range is 26 to 18500 Hz. (Use 340 m/s as the speed of sound.) What is the greatest length of an organ pipe that would have its fundamental note in your hearing range if i..
A stamp collector is viewing a stamp with a magnifying glass held next to her eye. Her near point is 25 cm from her eye. What is the angular magnification when the image of the stamp is 39 cm from the eye
A guitar string produces 4 beats per second when sounded with a 350-Hz tuning fork and 9 beats per second when sounded with a 355-Hz tuning fork. What is the vibrational frequency of the string
A state trooper chases a speeder along a straight stretch of road; both vehicles move at 136 km/h. The siren on the tropper's vehicle produces a sound of 490 Hz. What frequency is heard by speeder? (Take the speed of sound in air to be 343 m/s.)
Water at 20.0 °C is sprayed onto 0.236 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.5 m/s . Two seconds later the bicyclist hops on his bike and accelerates at 2.4m/s2 until he catches his friend. How much timedoes it take until h..
Suppose a formula for gain in heat energy of an object is H = m(A - B), where m = mass and (A - B) is its rise in temperature between A degrees and B degrees (as in #4). Write an expression for the absolute uncertainty, delta-H, in terms of m, del..
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