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In western movies, the hero sometimes detects an approaching trainby "listening" to the railroad tracks. If the tracks are made ofsteel, how many times faster does sound travel in the tracks thanin air? (Use 5790 m/s as the speed of sound in steel, and 343 m/sas the speed of sound in air.)
A uniform, cylindrical pulley of mass M=12.7 kg and radius R=0.636 m rotates freely about a fixed horizontal axis. What is the magnitude of the angular acceleration of the pulley
If the rms electric field of this light is 18.0N/C at a distance of 1.50m from the bulb, what is the average total power radiated by the bulb
A plastic cylinder of length 38 cm its ends ground to convex (from the rod outward) spherical surfaces, each having radius of curvature 19 cm, How far will the image of the object lie from the right end
Mercury has a mass MP = 3.18 x 1023 kg, an orbital period T = 88.0 days, and an orbital radius r = 5.79 x 10^10 m. Find the angular speed of Mercury about the Sun
A vessel contains 32 grams of dry ice (solid carbon dioxide) at T = -78°C, How much energy is required for the carbon dioxide to sublimate
Consider a gas of photons in a cavity with a single photon mode at finite temperature τ. Show that the entropy of the gas can be expressed in terms of the average photon number as
Block A in the figure weighs 1.60 N and block B weighs 3.10 N. The coefficient of kinetic friction between all surfaces is 0.300. Illustrate what is the friction force on block A?
A sound wave traveling at 341 m/s is emittedby foghorn of a tugboat. An echo is heard2.40 s later.How far away is the reflecting object? reply in units of m.
An airplane takes off at sea level and climbs to a height of 475 m. Estimate the net outward force on a passenger's eardrum
Suppose that an Egyptian farmer claims to have discovered a linen burial cloth used during Egypt's Middle Kingdom some 4000 years ago, How old is the cloth
Two narrow slits 0.204 mm apart are illuminated by light of wavelength 580. nm. The light falls on a screen 1.48 m away from the slits. What is the angular seperation between adjacent maxima
A painter (m=70 kg) is standing a distance of 0.6 m from the top of a ladder (mass 40 kg and length 2.5 m). Find the conditions for static equilibrium of the ladder with the painter on top
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