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A 1250 kg vehicle traveling at 21 m / s has to stop suddenly. The driver steps on the brake pedals and the vehicle glides, before stopping, a total distance of 65 m. (a) What work has the friction performed to stop the vehicle? (b) What is the coefficient of kinetic friction between the tires and the road?
A particle p traveling with a speed of vpi = 3 m/s hits and scatters elastically from another particle N, initially at rest. Particle p is deflected through 90°, leaving with a speed of vpf = 2.7 m/s, and a mass mp = 2 kg. What is the speed of the..
A 10.0 kg mass is placed on a 25.0 degree incline and frictionkeeps it from sliding. What is the frictional force in this situation
A total of 3.02 106 electrons are placed on an initially uncharged wire of length 1.45 m. What is the magnitude of the electric field a perpendicular distance of 0.400 m away from the midpoint of the wire?
A bungee cord is stretched between two poles with a force of 393 N. What is the velocity of a wave on this bungee cord
A spring with a spring constant of 85 N/m is stretched a distance of 0.45 m from its relaxed position. By how much does the spring's potential energy change
A car is driven 155 km west and then 75 km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
(1) A convex lens produces a real, inverted image of an object that is magnified 3.0 times when the object is 28 cm from the lens. (a) What is the image distance of the lens?
What is the magnitude of the electric field. A 50-gram super ball traveling at 25m/s is bounced off a brick wall and rebounds at 22 m/s. A high speed camera records this event. If the ball is in contact with wall for 3.5 ms, what is the average acc..
A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 9.00×10?3m/s2 less than that at sea level
A cannon with a muzzle speed of 992 m/s is used to start an avalanche on a mountain slope. At what angle, above the horizontal, should the cannon be fired
A pilot wants to fly due north a distance of 125 km. The wind is blowing out of the west at a constant 35 km/h. If the plane travel at 175 km/h, how long would the trip take.
The ammonia molecule NH3 has adipole moment of 4.8e-30 C·m. Ammonia molecules in the gasphase are placed in a uniform electric field with magnitude 1590000N/C. What is the change in electric potentialenergy when the dipole moment of the molecule c..
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