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A large gear is made by starting with a solid metal disk of mass 5 kg and radius 25 cm. Three holes are then created by removing disc shaped pieces each of mass 800 g and radius 10cm. The holes are centered between the center of the gear and its rim. Determine the moment of inertia for the gear spinning about its center. Use si units, and keep at least three significant figures
What is the instantaneous power, at a time of 0.00700 seconds, dissipated by a 200 ohm resistor in a resonant AC circuit powered by a generator with a 21.0 V greatest potential difference operating at 5000 rad/s .
Consider the Earth and a cloud layer 900 m above the planet to be the plates of a parallel-plate capacitor. what is the maximum charge the cloud can hold
Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and find out her altitude as she crosses the bar.
If an object of 50 grams of unknown material at 100 degrees C is mixed with 100 grams of water at 0 degrees C, the final temperature is 40 degrees C
If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t^2 + 20t. How many seconds does it take for the ball to reach its greatest height, and what is this height.
Let us model the electric behavior of such a molecule by a pair of ±1.60 × 10-19-C charges connected by a spring with force constant 8.29 × 10-4 N/m, Find the charge separation distance in an electric field of 6.41 × 105 N/C
True false questions on physics
The coefficient of kinetic friction between the block and incline is = 0.45. The mass of the spring is negligible.
Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h.
A large parallel plate capacitor has plate separation of 0.90 cm and plate area of 355 cm2. estimate How much work is done on the capacitor
An object moves with constant acceleration 3.55 m/s2 and over a time interval reaches a final velocity of 12.8 m/s. What is the distance it travels during this interval
An AC voltage of the form ?V = (85 V) sin (310 t) is applied to a series RLC circuit. If R = 46 ?, C = 29 µF, and L = 0.27 H, find the impedance of the circuit
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