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A particle of mass m is attached to the end of a light string of length l. The other end of the string is passed through a small hole and is slowly pulled through it. Gravity is negligible. The particle is originally spinning the round the hole with angular velocity w. Find the angular velocity when the string length has been reduced to 1/2 l. Find also the tension in the string when its length is r, and verify that the increase in kinetic energy is equal to the work done by the force pulling the string through the hole.
A bottle containing 3.4 kg (mass) of water at a temperature of 23.4 oC is placed in a refrigerator where the temperature is kept at 3.2 oC
A freely falling object requires 1.90 s to travel the last 22.0 m before it hits the ground. From what height above the ground did it fall? An attacker at the base of a castle wall 3.97 m high throws a rock straight up with speed 6.00 m/s at a height..
the combination of two circular coaxial coils of radius a separated by a distance also equal to a with equal currents i
An airplane has a speed of 250 km/hr and is climbing at an angle of 30o above the horizontal when it drops bomb. Determine how long was the bomb in the air
an elevator is able to raise a 1000 kg mass to a height of 40 m in 15 s.a how much work does the elevator do?b what is
A runner rounds a circular curve of radius 24.0 m at a constant speed of 5.25 m/s. What is the magnitude of the runner's centripetal acceleration
A family ice show is held in an enclosed arena. The skaters perform to music playing at a level of 79.0 dB. What total sound intensity engulfs you
A 15.0 g block with a charge of +6.00 10-5 C is placed in an electric field = (3000 - 600 ) N/C. What is the electrostatic force on the block
A hot-air balloon has a volume of 2741 m3. The density of the air outside the balloon is 1.205 kg/m3. How much weight can the balloon lift
A car is hauling a 92 kg trailer, to which it is connected by a spring. The spring constant is 2250 N/m. The car accelerates with an acceleration of0.34 m/s2. By how much does the spring stretch?
a 15-kg block rests on a level frictionless surface and is attatched by a light string to a 5.0-kg hanging mass, what is the tension in the connecting string
A very long, thin straight line of charge has a constant charge density of 20 pC/cm. How far does the electron go before it comes back
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