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In this section assume the sound speed in air is 343 m/s . A goose flying toward you at 11.3 m/s emits a squawk, which you hear at 246 Hz . Find the wavelength of the sound you hear. Express your answer with the appropriate units. Find the wavelength of the sound you hear if the goose emits the same squawk while flying away at the same speed? Express your answer with the appropriate units.
The potter can stop the wheel in 7.0 s by pressing a wet rag against the rim and exerting a radially inward force of 68 N. Find out the effective coefficient of kinetic friction between the wheel and the wet rag.
A child ties a rock to a string and whirls it around in a horizontal circle. find the period of its uniform circular motion
A 3.00 kg block starts from rest at the top of a 29.5° incline and slides 2.00 m down the incline in 1.25 s. Find the frictional force acting on the block
An electron accelerated from rest through a voltage of 470 V enters a region of constant magnetic field. what is the magnitude of the magnetic field
A 150 g block of ice at 0 C is dropped into 350 g of water at 25 C, compute the final equilibrium temperature
A dead tree is initially stationary and there is a 30.0-degree angle between the tree and the vertical, How fast is the top of the tree moving (in m/s) just before it hits the ground
If the work required to move a +0.25 C charge from point A to point B is +175 J, what is the potential difference between the two points
Practical steam engines utilize 450°C steam, which is later exhausted at 250°C. What is the overall efficiency of the two engines
Consider two solid conducting spheres of radii r1 = 2 cm and r2 = 3 cm. Sphere 1 initially carries a net charge of +6 ?C, What is the voltage at the surface of sphere 1? What is the net charge on sphere 1? On sphere 2
A 10 kg block sits motionless on a table in spite of an applied horizontal force of 2 N. What are the magnitudes of the reaction force
Football players measure their acceleration by seeing how fast they can sprint 40 yards (37m). For an 76kg player, what is the average power output for this sprint
A radiator has an emissivity of .90 and its exposed area is 1.23 m^2. the temperature of the radiator is 100 degrees C, what is the heat flow rate from the radiator
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