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During the pitching motion, a baseball pitcher exerted an average horizontal force of 60 N against the 0.15 kg baseball while moving it through a horizontal displacement of 2.0 m before he released it.
How much work did the pitcher do to the baseball as a result of this force?
Was the work done positive or negative?
If the baseball's velocity at the start of the pitching action was zero, how fast was the ball moving at the instant of release?
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1230 Hz. The bird-watcher, however, hears a frequency of 1260 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
What is magnitude of the runner total displacement
Two parallel wires of length 18 m are separated by a distance of a = 0.13 cm. The first carries a current of I1 = 5 A, What is the magnetic force on each wire
A particle with a mass of 6.64*10^-27kg and a charge of 3.20*10^-19Cis accelerated from rest through a potential difference of 2.45*10^6V. calculate the radius of the path inside the magnetic field
A new plant oil is discovered that is easy to recover from the plant and it might be a useful fuel. A question is the energy density of the fuel. Calculate the energy-density of this "new fuel"
As a tennis ball is struck, it departs from the racket horizontally with a speed of 27.3 m/s. How far above the court is the tennis ball
One particle has a mass of 4.41 x 10-3 kg and a charge of +6.92 ?C. A second particle has a mass of 6.52 x 10-3 kg, Find the initial separation between the particles
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.
The switch in a circuit has been open for a long time. The resistors in the circuit each have a value of 60 Ohms, find the total equivalent inductance of the circuit
A sealed 62 m3 tank is filled with 6000 moles of ideal oxygen gas (diatomic) at an initial temperature of 270 K. find the mass density of the oxygen gas
Polarized light goes through two Polaroid sheets. The angle between the two sheets is 50°. what is the angle between the original light and the first sheet
This problem introduces the concept of tension. The instance is a rope, oriented vertically, that is being pulled from both ends. Let and (with u for up and d for down) represent the magnitude of the forces acting on the top and bottom of the rope..
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