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Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 370 ? rad/s. One such flywheel is a solid, uniform cylinder with a mass of 490 kg and a radius of 1.00 m.
(a) What is the kinetic energy of the flywheel after charging?
(b) If the truck uses an average power of 7.7 kW, for how many minutes can it operate between chargings?
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.00×10^6 km, What is the total work done by the two tugboats on the supertanker
A 196.3 kg satellite is in a circular orbit of 26,273 miles (42,300,000 m) in radius. The force keeping the satellite in orbit is 40.1 N
The squadron commander has the mandate that the database update should be complete in less than one minute. If the topo database is 20 GB, and link is SONET, what is the minimum standard rate necessary.
a cube of wood floating in water supports a 200g mass at the centre of its top face. when the mass is removed, the cube rises by 2cm. determine the volume of the cube
Cars A and B are traveling around the circular race track. At the instant shown, A has a speed of 78ft/s, Determine the relative acceleration of car A with respect to car B at this instant
A stone is thrown vertically upward at a speed of 16 m/s at time t = 0. At what time are the two stones at the same height
A weightlifter bench-presses a 130.0 kg barbell from his chest to a height equal the length of his arms 0.850 m. How much work does he do? What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell
what is the magnitude of the charge on each sphere. A car crashes into a wall at 45 m/s and is brought to rest in 0.1 s. compute the average force exerted on a 80 kg test dummy by the seat belt.
A woman and her dog are out for a morning run to the river, which is located 3.5 km away. The woman runs at 2.4 m/s in a straight line. What is the total distance run by the dog
suppose a speck of dust in an electrostatic precipitator has 1.0000x1012 protons in it and has a net charge of -5.00nc
On a particular afternoon in Houston, the nitrogen (N2) molecules in the air have an rms speed of 511 m/s. What is the rms speed of the carbon dioxide (CO2) molecules
In a friction experiment, your wooden plank is horizontal. When a mass of 100 grams is hanging on the weight hanger of mass 50 grams, a slight push makes the block move at a constant speed along the plank. If the mass of a wooden block is 500 gram..
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