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A uniform rod of length 0.820 m and mass 13.0 kg is balanced on a sharp edge at 0.660 m from the left end. At the left end hangs a mass of 45.0 kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium.
Calculate the torque on the center of mass of the rod alone with respect to the pivot point.
Calculate the unknown mass.
A 9 V battery is rated at 80 Ah. It can deliver a current of 80 A for one hour, or a current of 40 A for 2 hours, etc. What is the total energy stored in the battery
The aire outside a hot-air balloon has a temperature of 17 C. Assume the pressure of the gas inside the balloon is roughly the same with the pressure outside of the balloon. What is the temperature of the air inside the balloon
A very light rod with a length of 1.95m extends straight out fromone end of a meter stick. The other end of the rod serves as apivot and the system is set into oscillation. determine the period of oscillation
Determine the initial rate of heat transfer from a hot pack to a patient due to thermal conduction (through the toweling) when the hot pack is applied
A satellite moves in a circular orbit around the Earth at aspeed of 4260 m/s. Determine the satellite's altitude above thesurface of the Earth
a helicopter lifts a 61 kg astronaut 13 m vertically from the ocean by means of a cable. the acceleration of the
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An unstretched spring with spring constant 21 N/cm is suspended from the ceiling. A 3.3 kg mass is attached to the spring and let fall. To the nearest tenth of the centimeter, how far does it stretch the spring.
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 443 Hz when the train is approaching him.
A speedboat starts from rest and accelerates at +2.15m/s2 for 8.35 s. At the end of this time, the boatcontinues for an additional 8.62 s with an acceleration of +0.629m/s2. Following this, the boat accelerates at -0.968m/s2 for 8.87 s.
A particle of mass m is placed on a frictionless horizontal table and attached by two identical massless spicral springs of natural length b and stiffness k, to two fixed points A and B on the table.
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