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To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 57.5 m when its initial speed is 77.8 km/h, and 26.8 m when its initial speed is 50.9 km/h. What is your reaction time?
The pulley is located so that the string makes a 45 degree angle with the beam. The beam is uniform, 5 meters long, and has weight. The professor stands 2 meters from the pivot point and has weight.
The component of the external magnetic field along the central axis of a 69-turn coil of radius 23.0 cm decreases from 1.90 T to 0.400 T in 1.70 s. what is the magnitude of the induced current in the coil
What is the speed of a wave on a string that has a mass of 9.6 kg and a length of 7.2 m while a 7.0 kg mass is hanging from the end?
A car is traveling with a constant velocity when the driver suddenly applies the brakes, giving the car a deceleration of 3.50 m/s2, what was the magnitude of the car's original velocity
You push with a horizontal force of 50.0N against a 24.0N box, pressing it against a rough wall to hold it in place. what is the friction force of the box
In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 3.50 m in diameter. The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim ..
A 100g ball is thrown straight up in the air from a height of 1.5 m above the floor. what was the initial speed of the ball
The car that hits a concrete barrier and takes 0.3 seconds to stop.
A car accelerates from rest to a kinetic energy of 1.65 x 10^5 Joules in a distance of 646 m. How much force did the car's engine deliver to produce the change in kinetic energy.
A skier is slinding downhill at 11 m/s when she reaches an icy path on which her skies more freely with negligible friction. find the speed of the skier at the bottom of the icy path
A potter's wheel having a radius 0.53 m and a moment of inertia of 11.4 kg, determine the effective coefficient of kinetic friction between the wheel and the wet rag
A bead with a mass of 0.050g and a charge of 20nC is free to slide on a vertical rod. At the base of the rod is a fixed 10nC charge. In equilibrium, at what height above the fixed charge does the bead rest?
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