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A record was set for stair climbing when a man ran up the 2100 steps of the Empire State Building in 10 min and 10 sec. If the height gain of each step was 0.2 meter, and the man's mass was 58.0 kilogram, find his average power output during the climb?
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A person sees a distant lightning strike, then 4.5 seconds later he hears the thunder clap. If it is 35 degrees Celsius, how far away was the lightning strike
A ball of mass 7 kg is thrown straight up in the earth's gravitational field with an initial speed v0 = 16 m/s. What is the initial kinetic energy of the ball
What is phase change as the light is reflected from the top
In order to freeze an ice cream mixture, its temperature must be brought below approximately -3°C. Explain how surrounding the ice cream in a salty ice water brine
The United States uses 1.12×1019J of electrical energy per year. How many kilograms of uranium would have to be mined per year to provide that much 235U
Assume the sound speed in air is 343 m/s. A jet aircragt's engines emit an 850 Hz roar. What frequency do you hear if the aircraft approaches you at 540mph
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). What is the speed at which the satellite travels
A heat engine with 0.500mol of a monatomic ideal gas initially fills a 1000cm^3 cylinder at 700K. How much work does this engine do per cycle
a single mass m1 4.0 kg hangs from a spring in a motionless elevator. the spring is extended x 11.0 cm from its
A generator rotates at 87Hz in a magnetic field of 9.0×10?2T . It has 600 turns and produces an rms voltage of 180V, find the area of each turn of the coil
A stone with a mass of 0.700 is attached to one end of a string 0.8 long. The string will break if its tension exceeds 65.0 . The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed.
in the javelin throw at a track-and-field event the javelin is launched at a speed of 30.0 ms at an angle of 39.2 deg
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