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An observer stands 23.1 meter behind marksman practicing at a rifle range. The marksman fires the rifle horizontally, the speed of the bullets is 831.6 m/s, and the air temperature is 20 degree Celsius. Calculate how far does each bullet travel before the observer hears the report of the rifle? Suppose that the bullets encounter no obstacles during this interval, and neglect both air resistance and the vertical component of the bullets' motion.
If a man is capable of lifting a 121 lb stone on land, how heavy a stone could he lift under water
a thermopane window consists of two glass panes each 0.50 cm thick with a 1.0 cm thick sealed layer of air in between.
the large swimming pool has a thermal cooling time constant of 12 days. how long will it take for the water temp. to
Find the speed at which Superman (mass=83.0 kg) mustfly into a train (mass = 16756 kg) traveling at 100.0 km/hr to stop it. Running into the train at that speed would severely damage both train and passengers.
A large turntable rotates about a fixed vertical axis, makingone revolution in 8.00 s. What is theangular speed of the turntable when the child is 3.00 m from the center
A massless spring with spring constant 22.10 N/m hangs vertically. A body of mass 0.280 kg is attached to its free end and then released. Assume that the spring was unstretched before body was released. How far below the initial position does the ..
the angular momentum of a spinning wheel is 235kg. after application of a constant braking torque for2.0s it slows and
q1. a 21-cm-long zero-resistance wire is pulled outward on zero-resistance rails at a steady speed of 1.0 in a 0.10
q1. the coefficient of static friction between the block and tables surface is ampmu s 13. the mass of the block that
A river flows due south with a speed of 2.00m/s{\rm m}/{\rm s} . A man steers a motorboat across the river, Find the horizontal component of the book's velocity
At a factory, a noon whistle is sounding with a frequency of 480-Hz. As a car travelling at 79 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory.
q1. an electron and a neutral carbon atom are firstly 2.2 times 10-6 m apart and there are no other particles in the
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