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A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. The string rotates at an angular speed of 45 rev/s, and its tip has a tangential speed of 52 m/s. What is the length of the rotating string?
A 100-kg halfback running north with a speed of 12 m/s is tackled by a 110-kg opponent running south with a speed of 4.0 m/s. If collision is completely inelastic and head-on, compute the speed of the players just after the tackle.
Two students are on a balcony 18.30 m above the street. One student throws a ball, b1, vertically downward at 16.80 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed.
If the player hears the sound of the splash 3.19 s later, illustrate what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
Two electrons are fixed 2.6 cm apart. Another electron is shot from infinity and comes to rest midway between the two. What was its initial speed
Two parallel plates, each of area 7.00 cm^2, are seperated by 3.50 mm of water, What is the magnitude of the potential difference between the plates
A 5 g bullet moving with an initial speed of 530 m/s is fired into and passes through a 2 kg block. find the speed at which the bullet emerges from the block
The men's world record for the shot put, 23.12m, was set by Randy Barnes of the United States on May 20, 1990. If the shot was launched from 6 f above the ground at an initial angle of 42 degrees, what was its initial speed.
A bullet of mass m = 25 g is fired into a wooden block of mass M = 4.5 kg. The block is attached to a string of length 1.5 m. The bullet is embedded in the block, causing block to then swing.
find magnitude of the tension in the wire and magnitudes.
Solar cells generate a potential difference when exposed to sunlight. In an experiment, you wish to charge a rechargeable battery by connecting it in series to an array of solar cells. What is the area of the array of solar cells
Consider the following equations of motion. v = v0 + at ?x = v0t + (1/2) at^2 v2 = v02 + 2a?x (a) Can the equations above be used in a situation where the acceleration varies with time? (b) Can they be used when the acceleration is zero?
A sound wave has a frequency of 677 Hz in air and a wavelength of 0.50 m. What is the temperature of the air
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