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The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.67 m and 1.05 m, respectively. The respective rotational speeds are 456 rev/min and 4,130 rev/min. Calculate the speeds of the tips of both rotors. main rotor tail rotor Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m/s Compare these speeds with the speed of sound, 343 m/s. vmain rotor / vsound = vtail rotor / vsound =
An engine draws energy from a hot reservoir with a temperature of 1250 K, What is the actual efficiency of this engine
You are driving east on 8th Street (Tamiami Trail) at a speed of 33. What is the frequency of the siren
A spring of spring constant k = 340 Nm-1 is used to launch a 1.5-kg block along a horizontal surface by compressing the spring by a distance of 18 cm. how far does the block slide
The minimum distance required to stop a car moving at 38.0 mi/h is 41.0 ft. What is the minimum stopping distance for the same car moving at 68 mi/h, suppose the same rate of acceleration.
Consider a uranium nucleus to be a sphere of radius R = 7.4x10^-15 m with a charge of 92 e distributed uniformly throughout its volume. What is the electric force exerted on an electron
Estimate the force P to accelerate the 80 - Ib block at 6ft/sec2 to the right.
An engine with an output of 170 W has an e?ciency of 45 %. It operates at 12 cycles/s. How much heat is absorbed in each cycle
Two lamps marked 60-watts, 120 volts and 40-watts, 120 volts are connected in series across a 120-volt line. What is the power consumption in each lamp
Two people are pushing on a box. One person pushes with a force of 5 N. The other person pushes in the same direction with a force of 4 N
A person is pushing a uniformly-loaded 21.65 kg wheelbarrow along a plank that makes an angle ? = 27.0° with the horizontal. What is the total force the person must apply
A soap film whose index of re%uFB02ecetion is 1.33 is suspended in air. When sunlight strikes the film nearly perpendicularly, two colors, Find the thickness of the film
A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.05 and a wavelength of 442 is traveling in the direction through empty space. What is the amplitude of the associated electric field
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