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A skater has rotational inertia 4.2 kg?m2 with his fists held to his chest and 5.7 kg?m2 with his arms outstretched. The skater is spinning at 3.0 rev/s while holding a 2.5-kg weight in each outstretched hand; the weights are 76 cm from his rotation axis. If he pulls his hands in to his chest, so they're essentially on his rotation axis, how fast will he be spinning? Express your answer using two significant figures. ?f=
Nichrome wire of cross-sectional radius 0.768 mm is to be used in winding a heating coil. determine the required resistance of the coil
If the rocket gases are expelled at a speed of 2010 m/s, explain how much mass must be expelled?
Suppose you have a near-point distance of 16 cm. The angular resolution of the eye is determined by diffraction, What is the smallest object your bare eye can resolve
A express train travels along a straight line between two stations, A and D. Stations B and C are spaced evenly along the line between A and D. The engineer leaves A and accelerates at a constant rate until he passes station B
A place-kicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short (vertically) of clearing the crossbar
A solenoid of length 5.0 cm and diameter 0.87 cm is wound with 162 turns per cm. The current is decreasing at a rate of 38.0 A/s. What is the induced emf in the entire solenoid
A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. What is the mass of the wheel
An eagle is flying horizontally at a speed of 3.00 m/s when the fish in her talons wiggles loose and falls into the lake 5.00 m, Calculate the velocity of the fish relative to the water when it hits the water
A charge +7.4 %u03BCC is placed at the center of the hollow spherical conductor with the inner radius 3.2 cm, What is the total charge on the interior
In lab, your instructor generates a standing wave using a thin string of length L = 2.10m fixed at both ends. What is the maximum transverse speed vy of the bead
A 10 resistor, 10 mH inductor, and a 110.0 µF capacitor are connected in series to a 50.0 V (rms) source having variable frequency. Find out the energy delivered to the circuit during one period if the operating frequency is twice the resonance fr..
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -18.20 eV. What is the energy of the first photon emitted
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