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While standing near a railroad crossing, you hear a train horn. The frequency emitted by the horn is 350Hz . If the train is traveling at 75 km/hr and the air temperature is 25C , what is the frequency you hear when the train is approaching you? What is the frequency you hear after the train has passed?
A cannonball is dropped from the top of a building. If the point of release is 44.8 m above the ground, what is the speed of the cannonball
An inductor (L = 400 mH), a capacitor (C = 4.43 µF), and a resistor (R = 500 ?) are connected in series. Determine the phase angle by which the current leads or lags the applied voltage
An object with mass 4.0kg is executing simple harmonic motion, attached to a spring with spring constant 300N/m, Calculate the amplitude of the motion
A thin double convex lens is to focus the image of an object onto a screen so that the image is life-sized. What is the distance d from image to screen
An isolated copper sphere of radius 4.85cm, at first uncharged, is illuminated by ultraviolet light of wavelength 244nm. The work function for copper is 4.70 eV. What charge does the photoelectric effect induce on sphere.
A 5.9-kg rock and a 6.6 × 10-4-kg pebble are held near the surface of the earth. Determine the magnitude of the gravitational force exerted on each by the earth
Three forces acting on an object are given by 1 = (?2.45 + 5.60) N, 2 = (5.30 ? 1.3) N, and 3 = (?42.5) N. What is the direction of the acceleration
A chair of mass 13.0kg is sitting on the horizontal floor; the floor is not frictionless, Use Newton's laws to calculate the normal force that the floor exerts on the chair
A rocket with an initial mass of 1 000 kg adjusts its thrust by varying the rate at which mass is ejected. at what rate is mass being ejected at that instant
A 2.50-kg block slides on a horizontal surface with coefficient of kinetic friction 0.310. It is moving at 5.45 m/s, Find the distance of compression
Walk 10 miles in the direction 54 degrees east of due north. Then walk 4 miles in the direction 23 degrees south of due east. How far will you be from your starting point?
A Goodyear blimp typically contains 6280 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. What is the mass (in kg) of the helium in the blimp
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