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Two cars are traveling at equal speeds but in opposite directions. One car sounds its horn at a frequency of 111 Hz, which the other driver hears as a frequency of 105 Hz. What is the speed of each car? Use 343 m/s for the speed of sound in this problem.
A 2590-kg spacecraft is in a circular orbit 2720 km above the surface of Mars. How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4480 km above the surface
An atomic nucleus at rest decays radioactively into an alpha particle and a smaller nucleus. What will be the speed of this recoiling nucleus
A circular coil of wire of 200 turns and diameter 3 cm carries a current of 3 A. What is the torque on the coil
A 56.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.790 and 0.400, respectively. What horizontal pushing force is required to just start the crate moving
A marble moving 1.48 m/s rolls off the top edge of a 125. cm high table. How far from the base of the table did it strike the floor
A student from Sidney, Australia compares the distance he obtained from the 1-st spark mark to the 20-th spark mark, What difference in the results was found
A 1500 {rm kg} car skids to the halt on a wet road where mu_k = 0.50. How fast was the car travelling if it leaves 66-{rm m}-long skid marks.
A 3.2 m long pendulum is released from rest when the support string is at an angle of 23° with the vertical. What is the speed of the bob at the bottom of the swing
Two charged objects experience a mutual repulsive force of 0.71 N. If the charge of one of the objects is reduced by half and the distance separating the objects is quadrupled, what is the new force? (Enter the magnitude of the force.)
A water wave passing a point causes a cork to bob up and down through a total distance of 1 m, completing one cycle every 1.5 sec
A 78.0 ohm and a 48.0 ohm resistor are connected in parallel. When this combination is connected across a battery, the current delivered by the battery is 0.275 A.
suppose the resistance between the hands is due entirely to the skin. what is the resistivity of skin
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