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A child is twirling a 0.0165-kg ball on a string in a horizontalcircle whose radius is 0.130 m. The ball travels once around the circle in 0.649 s. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, by what factor does the centripetal force increase?
A fullback with a mass of 75 kg and a velocity of 4.0 m/s due west collides head-on with a defensive back with a mass of 88 kg and a velocity of 5 m/s due east. What is the initial momentum of each player
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." what is the "hang time"
Suppose the traffic light is hung so that the tensions T1 and T2 are both equal to 84.7 N. Find the new angles they make regarding the x axis. (By symmetry, these angles would be the same.)
two cars a and b approach each other at an intersection. car a is traveling south at 20 ms while car b is traveling
Suppose there simple circuit: one battery, one resistor, andone capacitor all connected in series. Does any one specificcharged particle ever make a complete trip around the loop in sucha circuit?
a spherical surface completely surrounds a collection of charges. find the electric flux through the surface if the
A car is driven 175km west and then 55km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
Two circular metal plates of radius 0.17 m and thickness 8.5 mm are used in a parallel plate capacitor. A gap of 1.7 mm is left between the plates, What is the capacitance of this capacitor
If a block of wood floating on a pool of water has a volume of 37 cm3anddisplaces a volume of waterof 30 cm3, what is the densityof the wood
An energetic father stands at the summit of a conical hill as he spins his 21 child around on a 5.1 cart with a 2.1--long rope. The sides of the hill are inclined at 25 . He keeps the rope parallel to the ground, and friction is negligible. What rope..
A proton is fired directly into a uniform electric field that is able to bring the charge momen- tarily to rest. How much work does the electric field do in stopping the proton
A solar concentrating heat exchanger system directs sunlight onto a long straight pipe. The pipe receives heat from sunlight at the rate of 153.616 Btu/hr per foot of length, find the rate of entropy production in this solar concentrator
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