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In a head-on collision, a car stops in 0.30{\rm s} from a speed of 30{\rm m}/{\rm s} . The driver has a mass of 80{\rm kg} , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
How many revolutions per minute would a 29 {rm m}-diameter Ferris wheel require to make for the passengers to feel "weightless" at topmost point.
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field
an electric field as shown in the figure. an electric field of 1000. v/m is directed toward the right. The ball has a mass of 2.00x10^-3 kg, what is the net charge on the ball
A box-shaped piece of concrete measures 3ft by 2ft by 0.5ft. Find the buoyancy force that acts on it when it is submerged in water
If two successive overtones of a vibrating string are 420 Hz and 480 Hz, what is the frequency of the first overtone
Gayle runs at a speed of 4m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5m, her brother.
What is the propotion of the mass of these excess electrons to the mass of the penny.
A 79, 37--long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 13 ball of clay travelling horizontally at 2.6 hits and sticks to the extremely bottom tip of the rod.
As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy (\"heat\") from entering/exiting the building, find the shift in path ?x as the light enters ..
how much mass can the larger piston support.
the fact that it moves very slowly by sky would probably cause it to be named after Yurtle, the god of turtles.
The temperature of the surface of a certain star is 7500 K. Most hydrogen atoms at surface of the star are in the electronic ground state. What is the approximate fraction of hydrogen atoms that are in the first excited state (and therefore could ..
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