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A 300g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 cm above the floor.
What was the tension in the string an instant before it broke?
The resistivity of copper at room temperature is 17 x 10^-9 m Ohms. What diameter of copper wire is required to give a copper wire 10 meters long a resistance of 2 x 10^-3 Ohms?
An electron moves in the positive x-direction a distance of 2.31 m in 2.85·10-8 s, bounces off a moving proton, and then moves in the opposite direction a distance of 1.53 m in 3.33·10-8 s.
A rectangular block of ice 12 m on each side and 1.2m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917kg/m3.
A 0.20 {rm kg} rock is thrown vertically upward from the top of a cliff that is 31.0 {rm m} high. While it hits the ground at the base of the cliff, the rock has the speed of 31 {rm m/s}. Assume that air resistance can be ignored; find the initial sp..
A barge of mass 5x 10^4 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45° to the canal.
An ice cube sliding along the ground at 5 m/s goes off a ramp pointed straight up as shown, What is the speed of the ice cube when it comes down, just before it hits the ground
Vector A is in the direction 44.0 clockwise from the negative y-axis. The x-component of is = -19.0 What is the -y component of A? What is the magnitude of A.
Then a second inductance L2 =10 mH is connected in parallel with L1. Find out (a) the current that the generator delivers to L1 and (b) to the parallel combination.
Two small insulating spheres with radius 9×10-2 are separated by a large center-to-center distance of 0.52. One sphere is negatively charged.
What is new angular speed of the merry-go-round
The position of a particle moving along the x axis is given by x = (32 + 40t - 8.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to 3.0 s?
Suppose that the aluminum cup inside a calorimeter has a mass of 48 g and contains 84 g of water. Both the cup and water are initially at a temperature of 5.6 degrees C, what is your best estimate of the specific heat of the aluminum
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