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A 150lbf bucket of water is connected to a helicopter by a rope. The rope pulls on the bucket with a force of 1000N at an angle of 25 degrees to the right of vertically upward. Air resistance exerts a force of 350N horizontally to the left. What is the acceleration of the bucket?
An alien spaceship traveling at 0.610c toward the Earth launches a landing craft. What speed do the Earth-based observers measure for the approaching landing craft
The alarm at a fire station rings and a 79-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.3 m). Just before landing, his speed is 1.2 m/s. What is the magnitude of the kinetic frictional force exerted on the fi..
A projectile is launched straight up at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory and what is the ..
A current of 2.5 a runs through 20 circular wire loops of diameter 10 cm. What is the magnetic field magnitude and direction at the center of the loops? (Show the derivation of any formula that you use.)
A major-league pitcher can throw a baseball in excess of 48.7m/s. If a ball is thrown horizontally at this speed, how much will it drop by time it reaches the catcher who is 15 m away from the point of free.
It's possible for a determined group of people to pull an aircraft. Drag is negligible at low speeds, Estimate the force with which each officer pulled on the plane
Suppose you design an apparatus in which a uniformly charged disk of radius R is to produce an electric field. The field magnitude is most important along the central perpendicular axis of the disk, at a point P at distance 2.90R from the disk (Fi..
Two point charges are placed on the x-axis. The first charge,q1 = 8.00 nC, is placed a distance 16.0 m from the origin along the positive x-axis; the second charge, q2 = 6.00 nC, is placed a distance 9.00 m from the origin along the negative x-axis.
If a 93.0-V emf is connected to the terminals A and B and the current in the 4.0-? resistor is 16.8 A, what is the value of the unknown resistor R
A 25.0 kg child slides down a long slide in a playground. She starts from rest at a height h1 of 20.00 m. When she is partway down the slide, Calculate the mechanical energy lost due to friction
An outfielder throws a baseball with an initial speed of 10m/s. An infielder catches the ball at the level 1m lower. Ignore air resistance and determine the speed of the ball and its kinetic energy when the infielder catches it. The mass of the ball ..
If FA→ = 10 N, FC→ = 20 N, FD→ = 30 N, the width of the door is 1.1 m and θ = 30o (angle between FD and the direction of the length of the door), find the net torque produced at the door hinge
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