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A cockroach of mass m lies on the rim of a uniform disk of mass 3.28m that can rotate freely about its center like a merry-go-round. Initially the cockroach and disk rotate together with an angular velocity of 0.268 rad/s. Then the cockroach walks halfway to the center of the disk. (a) What then is the angular velocity of the cockroach-disk system? (b) What is the ratio K/K0 of the new kinetic energy of the system to its initial kinetic energy?
A system consists of 0.697 kg of water at 80 degrees C. A paddle wheel does 42 kJ of work stirring the water. The heat energy lost to the environment is 15 kJ. What is the final temperature of the system in degrees C?
What is the speed of an electron with a de Broglie wavelength of 0.140nm and 0.140nm
A log is floating on swiftly moving water. A stone is dropped from rest from a 72.0-m-high bridge and lands on the log as it passes under the bridge. what is the horizontal distance between the log and the bridge
a person with a remote mountain cabin plans to install her own hydroelectric plant. a nearby stream is 3.00 m wide and
the 20 g centrifuge at nasas ames research center in mountain view california is a horizonatal cylinderical tube 58 ft
I am working on a project where we need to find an optimal transfer for a spacecraft from LEO to the L4 LaGrange point in the Earth-Moon system. In order to calculate the delta V for the arrival at the LaGrange point, we need to know the "veloci..
A certain refrigerator is rated as being 31% as efficient as a Carnot refrigerator. how much work must the refrigerator motor do
An object with mass 4.0 is attached to a spring with spring stiffness constant 230 and is executing simple harmonic motion. When the object is 1.9×10?2 from its equilibrium position, it is moving with a speed of 0.65 . Calculate the amplitude of the ..
the two hot air balloons in the drawing are 48.2 and 61.0 m above the ground. a person in the left balloon observes
A force Farrowbold applied to an object of mass m1 produces an acceleration of 3.70 m/s2. find its acceleration under the action of the force Farrowbold
Assume that it takes 2.30 kg of oxygen to burn 1.00 kg of coal. (The actual amount varies with the type of the coal). What is the total mass of the reagents used in the combustion all through the 30 days.
The barricade at the end of subway line has a large spring designed to compress 2.00 m when stopping a 1.00 x 10^5 kg train moving at 0,500 m/s. What speed would the train be going
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