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A siren at rest has a frequency f0. Standing at a crosswalk, a student hears a frequency f' from the siren in an approaching police car. After the car passes, the observed frequency is f". Let the speed of the siren (or the car) be Vc, and the speed of sound be Vs. If f' and f" are 570Hz and 400 Hz respectively, and the speed of sound in air is 340 m/s, find the speed of the car. Answer in units of m/s
A rock with mass m = 3.70 kg falls from rest in a viscous medium. The rock is acted on by a net constant downward force of F = 19.3 N and by a fluid resistance force.
Four objects are situated along the y axis as follows: a 2.01 kg object is at +3.16 m, Where is the center of gravity of this system
A dolphin in an aquatic show jumps straight up out of the water at a velocity of 14.5 m/s. How high does his body rise above the water in meters
A voltage of 20.0 V is applied across the two ends of a Tungsten wire with a temperature coefficient of resistivity of 4.50×10-3 1/K. determine the power dissipated by the wire
A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consisting of two protons, two neutrons, and no electrons).
you notice that the image flips when you are 0.500 m from the mirror. Determine the radius of curvature for the mirror
A 62 kg person on skis starts from rest down a hill sloped at 40° from the horizontal. The coefficient of friction between the skis and the snow is 0.10.
Find the temperature rise of the bullet assuming the impact occurs so rapidly that the impact process can be considered to be adiabatic. For lead, use fu = 0.0130(T) in Btu/lbm, where T is in °F or R.
Estimate the number of breaths taken by a human being during an average lifetime
A charged object has a potential of 40 V at a distance of 3 m. If the distance is increased to 42 m, then what will be the new potential
A half-Atwood machine consists of a block of mass 4.0 kg on a table, connected by a string that passes over a pulley to a hanging mass of 5.0 kg. how fast is it moving after the hanging block has fallen 2.0m
A converging lens with a focal length of 5.0cm is to the left of a second identical lens. When a feather is placed 13cm to the left of the first lens, What is the separation between the lenses
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