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An ambulance with a siren emitting a whine at 1600 Hz overtakes and passes a cyclist pedaling a bike at 2.44 m/s. After being passed, the cyclist hears a frequency of 1560 Hz. Use 343 m/s for the speed of sound in air. How fast is the ambulance moving?
A person with a weight of 237 lb stands on two feet with their weight equally distributed between the two shoes, What is the pressure on each shoe independently
While standing on a bridge 45m above the ground, you drop a stone from rest. When the stone has fallen 4.90m, you throw a second stone straight down. What initial velocity should you give the second stone if they are both to reach the ground at th..
A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m-high rise as shown in Figure 8. Find her final speed at the top
For the motion from the initial free until the piece of wood comes to rest, what is the total amount of work completed by friction.
suppose that .12 mol of nitrogen gas in contact with a thermal reservoir that holds the temperature fixed at T0=9.8C has an initial volume of 1.3L and does 14J of work
If the capacitor is discharged in 3.0 ms, how much charge passes through the body tissues, What is the average power delivered to the tissues
An object is accelerated by a force. If the acceleration increases by a factor 2 and the mass increases by a factor 4, by what factor was the force increased
Waves moving on a lake have a speed of 2.8 m/s and a distance of 1.6 m between adjacent crests. Find the period of the wave motion
If the tension in each chain at the lowest point is 408 N, find the child's speed at the lowest point.
A lens for a 35-mm camera has a focal length given by f = 47 mm. What is the magnification of the image on the film
A 1000N force stretches a wire by 4.0mm . A:A second wire of the same material is twice as long and has twice the diameter. How much force is needed to stretch it by 1.0 mm? B:A third wire of the same material is twice as long as the first and has..
Consider a stellar atmosphere (consisting entirely of atoms with an absorption cross-section of s) where the number density, n, is NOT constant. Let n be linear with respect to depth:
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