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A skater spins at 3 rev/s when she stretches her arms outward. If she keeps her fists on her chest she can spin at 4.5 rev/s and her body inertia is 3 kg.m2. Find her body inertia when she stretches her arms outward?
A solid sphere has a temperature of 408 K. The sphere is melted down and recast into a cube that has the same emissivity, What is the cube's temperature
Compute the de Broglie wavelengths of (a) an electron, (b) a proton, and (c) a Au nucleus (A=197 g/mole) with a kinetic energy of 20 eV, and these same particles (parts d, e, & f) if they have a kinetic energy of 10 GeV. (Relativity is important f..
A flat surface having an area of 3.4m2 is rotated in a uniform electric field of magnitude E = 6.6 multiplied by 105N/C. Decide the electric flux during this area in the following situations. When the electric field is parallel to the surface
Insects do not have lungs as we do, nor do they breathe through their mouths. Instead, they have a system of tiny tubes, called tracheae, through which oxygen diffuses into their bodies. find the oxygen concentration at the interior end of the tube
The rod in question c is now lies horizontally, supported on eachend by a piece of wood (point A is the end farthest from the centerof gravity, find the force exerted by the pillars on the rod
A generator uses a coil that has 390 turns and a 0.65-T magnetic field. The frequency of this generator is 60.0 Hz, determine the length of the wire from which the coil is made
A jet airplane in level flight has a mass of 8.66 × 104kg and the two wings have an estimated total area of 90.0m2. (a) What is the pressure difference among the lower and upper surfaces of the wings?
Two 1.50-V batteries-with their positive terminals in thesame direction-are inserted in series into the barrel of a flashlight. What is the lamp's resistance
A uniform drawbridge must be held at a 37 angle above the horizontal to allow ships to pass underneath. What is the angular speed of the drawbridge
A thin 5.6-m metal rod sustanins a longitudinal standing wave with vibration antinodes at each end of the rod. What is the frequency of the rod's vibration
Water is to be pumped to a top of a building, which is 145 m high. What measure pressure is needed in the water line at the base of the building to raise the water to this height? (The density of water = 1000 kg/ m3)
A rotating wheel requires 3 s to rotate 37 revolutions. Its angular velocity at the end of 3 s interval is 98 rad/s. What is the constant angular acceleration for the wheel
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