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A helicopter drops a paratrooper carrying a buzzer that emits a 500 Hz signal. A sound receiver on the plane monitors the signal as the paratrooper falls. If the perceived frequency becomes constant
Soccer player #1 is 6.2 m from the goal, as the figure shows. If she kicks the ball directly into the net, the ball has a displacement labeled . If, on the other hand, she first kicks it to player #
Three equal point charges, each with charge 1.60 , are placed at the vertices of an equilateral triangle whose sides are of length 0.450 . What is the electric potential energy of the system?
The river is 234.5 m across, but because of one side having a cliff, the road(on the bridge) needs to be elevated 13.2 degrees. What will be the length of the road?
In the field of psychology, what is meant by the term "catharsis"? According to Joseph Bruer, what effect did "catharsis" have on the mental functioning of someone with a "troubled mind"? Why?
A charge of -6.0 nC is at the origin and a second charge of 13.0 nC is at x = 8.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 35.0 m above its launch point. What was the arrow's initial speed? How long did it take
Blocks with masses of 7.0 kg , 8.0 kg , and 9.0 kg are lined up in a row on a frictionless table. All three are pushed forward by a 13 N force applied to the 7.0 kg block.
Find, the magnitude of the final velocity of the two-block system.
Two of the fragments move with the same speed right after the explosion as the entire projectile had just before the explosion; one of these moves vertically downward and the other horizontally.Dete
A cannonball is fired horizontally from the top of a cliff. The cannon is at height h = 50.0 m above ground level, and the ball is fired with initial horizontal speed v(initial). Assume acceleration
The magnitude FN of the normal force that each side of the tread channel exerts on the stone is 1.8 N. Assume that only static friction supplies the centripetal force, and determine the radius r of
An unknown volume of laughing gas has a temperature of 325 K and a pressure of 0.5 kPa. The temperature is decreased to 320 K, the pressure is increased to 1.2 kPa, and the final volume of the gas i
During the pitching motion, a baseball pitcher exerts an average horizontal force of 60 N against the .15 kg baseball while moving it through a horizontal displacement of 2.0 m before he releases it
How much energy is stored in the magnetic field? (b) At what rate is thermal energy developed in the inductor?
A baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23.0 m/s. If the ball was caught 42.0 m from the thrower,, how long was it in the air? How high was the tallest s
During a heavy rain, the drops are falling at a constant velocity and at an angle of 10.5° west of the vertical. What is your walking speed if the speed of the drops relative to the ground is 5.
The triangle has to rotate, because otherwise the stars would crash together in the center. What is the period of rotation?
An electron moves at a speed of 6.0 x 10^-6 perpendicular to a constant magnetic field. The path is a circle of radius 1.3 x 10^-3m. What is the magnitude of the field. Find the magnitude of the ele
A 2.2-kg object is suspended from a spring with k = 18 N/m. The mass is pulled 0.35 m downward from its equilibrium position and allowed to oscillate. What is the maximum kinetic energy of the obje
A 1.6 kg cylinder (radius = 0.1 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. What is its translational kinetic energy?
The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting
Under the influence of a drive force of 235 N, it is moving at a constant velocity whose magnitude is 4.23 m/s. The drive force is then shut off. Find (a) the distance in which the snowmobile coasts
Calculate the frequency of the damped oscillation. (b) By what percentage does the amplitude of the oscillation decrease in each cycle?
A bucket of mass 1.90 kg is whirled in a vertical circle of radius 1.30 m. At the lowest point of its motion the tension in the rope supporting the bucket is 22.0 N.