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At the Indianapolis 500, you can measure the speed of cars just by listening to the difference in pitch of the engine noise between receding and approaching cars. Assume the sound of a certain car drops by a factor of 1.40 as it goes by on the straightaway. Evaluate how fast is it going? (Take the speed of sound to be 343 m/s.)
----------km/h
Spider silk has a Young's modulus of 4.0x10^9 N/m^2 and can withstand stresses up to 1.4x10^9 N/m^2. what angle does the web make with the horizontal
A 11.0 g rifle bullet is fired with a speed of 360 m/s into a ballistic pendulum with mass 10.0 kg, suspended from a cord 70.0 cm long. Compute the vertical height through which the pendulum rises
A teenager pushes tangentially on a small hand-driven merry-go-around and is able to accelerate it from rest to a frequency of 15 rpm in 10.0 s. determine the net work performed by the children
question a 40.2 l constant-volume cylinder containing 2.21 mol he is heated until the pressure reaches 4.20 atm. what
Two nonconservative forces are present: friction does -2.00 104 J of work on the car, and a chain mechanism does +3.00 104 J of work to help the car up a long climb. Illustrate what is the change in the car's kinetic energy, ΔKE = KEf - KE0, fro..
An electron is in the n=5 state of hydrogen. To what states can the electron make transitions and what are the energies of the emitted radiations?
An amusement park ride called the Rotor consists of a room in the shape of a vertical cylinder (1.98 m inradius) which, once the riders are inside, begins to rotate,forcing them to the wall. When the room reaches a speed of onerotation every 1.56 ..
question cliff height you are climbing in the high sierra where you suddenly find yourself at the edge of a
A ball is thrown straight upward and reaches the top of its path in 1.71 s (before it starts to come back down). At what speed must the second ball be thrown
if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. What is the propulsion force need tot keep the car moving
An object is being acted upon by three forces and moves with a constant velocity. What is the direction of the third force
A stamp collector is viewing a stamp with a magnifying glass held next to her eye. What is the refractive power of a magnifying glass that has an angular magnification of 5.8 when the image of the stamp is located at the near point
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