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A 50 kg person stands at the edge of a 7.4 m diameter circular platform, which is mounted horizontally on frictionless bearings and has a total mass of 300 kg. The platform is at rest initially, but when the person begins running at a speed of 10 m/s (with respect to the platform) around its edge, the platform begins to rotate in the opposite direction. What is the magnitude of the speed of the person (in m/s) with respect to the ground? You can model the platform as a circular disk.
A ball is thrown directly downward with an initial speed of 8.60 m/s, After what time interval does it strike the ground
Calculate change in kinetic energy
A daring 51kg swimmer dives off a cliff with a running horizontal leap, What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom
When high-energy charged particles move through a transparent medium with a speed greater than the speed of light in that medium, Calculate the speed of the electrons in the water. The speed of light in water is 2.25 108 m/s
A transformer is to be used to provide power for a computer disk drive that needs 7.0 V (rms) instead of the 120 V (rms) from the wall outlet. Find the number of turns in the secondary
A speedboat moving at 38.0 m/s approaches a no-wake buoy marker 100 m ahead. What is the velocity of the boat when it reaches the buoy
assume you are 90 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.5 mm.
In exercising, a weight lifter loses 0.123 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifter's body. find the change in the internal energy of the weight lifter
The G string of a guitar which should be 397 Hz is playing flat at 380 Hz. What percentage change in the tension of the wire is necessary so as to tune the string to 392 Hz.
Your friend Joe hangs from a horizontal bar by his two hands, with his arms each inclined 35 degrees from the vertical, what is the tension in each of his arms
A 1000kg car accelerates from rest to 60mph (134m/s) in 10s. During this time, its engine was operating at 3600rpm. Use the work-energy theorem to find the net work done by the car
An argon-ion laser produces a cylindrical beam of light whose average power is 0.662 W. How much energy is contained in a 1.88-m length of the beam
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