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1. Two sources, A and B, emit a sound of a certain wavelength. The sound emitted from both sources is detected at a point away from the sources. The sound from source A is a distance d from the observation point, whereas the sound from source B has to travel a distance of 3λ. What is the largest value of the wavelength, in terms of d, for the maximum sound intensity to be detected at the observation point? If d = 10.0 m and the speed of sound is 340. m/s, what is the frequency of the emitted sound?
2. A train whistle emits a sound at a frequency f = 3000. Hz when stationary. You are standing near the tracks when the train goes by at a speed of v = 30.0 m/s. What is the magnitude of the change in the frequency (|Δf|) of the whistle as the train passes? (Assume that the speed of sound is v = 343 m/s.)
3. Two trains are traveling toward each other in still air at 25.0 m/s relative to the ground. One train is blowing a whistle at 300. Hz. Assume that the speed of sound is 343 m/s.
a) What frequency is heard by a man on the ground facing the whistle-blowing train?
b) What frequency is heard by a man on the other train?
A 0.760 m long brass pendulum experiences a 21.0°C temperature increase. What is the change in the period
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A small object is placed to the left of a convex lens and on the optical axis. obtain the position of the image formed by the lens?
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Determine the voltage drop along a 26 meter length of household no. 14 copper wire (used in 15-A circuits). The wire has diameter 1.628 millimeter and carries a 10 A current
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you pull a simple pendulum of length 0.240m to the side through an angle of 3.50degree and release it. a. how much time
A child slides down a playground slide; the coefficient of the kinetic friction is uk=0.15, with what speed does she exit the slide
A microscope with a tube length of 200 mm achieves a total magnification of 400x times with a 20x times objective and a 20x times eyepiece. How far is the sample from the objective lens
An airplane with a speed of 87.7 m/s is climbing upward at an angle of 35.1 ° with respect to the horizontal. When the plane's altitude is 533 m, the pilot releases a package.
A 2000 kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest ( 45 degress N of W.) what is the direction of the resultant acceleration?
Consider a gas of fermions at temperature T=0 in 3D space with dispersion law E(p) = v lpl^3 where v is a constant. calculate the Fermi energy and the ground energy
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