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In a skating stunt known as "cracking-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 80.0 kg and is 5.60 m from the pivot. He is skating at a speed of 6.05 m/s. Determine the magnitude of the centripetal force that acts on him.
A crate is dragged 4.0m along a rough floor with a constant velocity by a worker applying a force of 450N to a rope at an angle of 30? to the horizontal
Three boats exert forces on a mooring hook. The first pulls 420 N at 60 degrees from the East. ind the resultant direction of force of the combination of these three forces
Consider 10 air molecules in an otherwise empty room. Find the probability that exactly four molecules are in the front third and exactly six in the top half, exactly three molecules are both in the front third and the top half (that is, the same mol..
A technician wraps wire around a tube of length 33 cm having a diameter of 7.9 cm, Find the self-inductance of this solenoid
A hot wheels track has a spring loaded launcher. A 100g car is pushed into the launcher, which compresses the spring by 2cm. The cars initial velocity after launching is 3m/s.
A relief airplane is delivering a food package to a group of people stranded on a very small island. After a package is ejected from the plane, how long will it take for it to reach sea level from the time it is ejected
What is Kepler's First Law and in this experiment, there are eight pairs of photographs. In each pair, what things are the same in each? What things are different?
Huck Finn walks at a speed of .6m/s across his raft (that is perpendicular to the raft's motion relative to the shore). what is Huck's velocity(speed and direction) relative to the river bank
Initially, the switch in the figure below is open and the capacitor is uncharged. V = 3 V and C = 18 µF. How much charge flows through the switch after the switch is closed
A sinusoidal voltage ?v = (75 V) sin (140t) is applied to a series RLC circuit with L = 20 mH, C = 100 ?F, and R = 46 ?. What is the impedance of the circuit
a) Use conservative of energy to find the car's speed at the top of the loop and at the bottom of the loop. b) what is the centripetal acceleration ar=V^2/r at the top of the loop and bottom of the loop
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. Find the initial speed of this second balloon
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