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Two 5.5-kg balls, each with a radius of 0.10 m, are in contact with one another. What is the gravitational attraction between the balls?
A football coach in hopes of improving his kicker's performance fills a .9 kg football with helium rather than air. what change in relative weight of the football (change in weight divided by weight) is to be expected
A skydiver deploys his parachute when he is 1020 directly above his desired landing spot. He then falls through the air at a steady 4.3m/s . There is a breeze blowing to the west at 2.0m/s.
A magnetic dipole antenna is used to detect an electromagnetic wave. The antenna is a coil of 50 turns with radius 5.1 cm. The EM wave has frequency 870 kHz, electric field amplitude 0.56 V/m, and magnetic field amplitude 1.87 10-9 T.
A spotlight is coated so that it won't transmit magenta light from its white-hot filament. What colour emerges from coated spotlight.
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of -0.7692 N when separated by 50 cm, center-to-center, What were the initial charges on the spheres
a girl is riding her bicycle . when she gets to a corner, she stops to get a drink from her water bottle. how long does it take for her to catch up with her friend
If the coefficient of kinetic friction between a 30.0 kg crate and the floor is 0.33, what horizontal force is required to move the crate at a steady speed across the floor
Two narrow, parallel slits separated by 0.200 mm are illuminated by green light (? = 546.1 nm). Calculate the distance between the first and second dark bands
A telescope has an objective with a refractive power of 1.50 diopters and an eyepiece with a refractive power of 270 diopters
Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A has a radius 7 times that of sphere B. Let and be the charges on the two spheres, and let and be the electric-field magnitu..
A student drops a lit firecracker off the roof of abuilding with an initial velocity vo=0. She hearsit explode 10s later. The speed of sound is 330. What is its speed when it exploded
You have a special lightbulb with a very delicate wire filament. What is the largest root-mean-square current you can run through this bulb
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