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Get college assignment help at uniessay writers Block A in the figure weighs 1.60 N and block B weighs 3.60 N. The coefficient of kinetic friction between all surfaces is 0.400. Find the magnitude of the horizontal force vec F_a necessary to drag block B to the left at a constant speed of 6.00 cm/s if A rests on B and moves with it.Find the magnitude of the horizontal force vec F_b necessary to drag block B to the left at a constant speed of 6.00 cm/s if A is held at rest by a string.In part (A), what is the friction force on block A?

A heavy ball with a weight of 110 N is hung from the ceiling of a lecture hall on a 4.5-{rm m}-long rope. The ball is pulled to one side and released to swing as a pendulum, reaching a speed of 5.8 m/s as it passes through the lowest point. What is the tension in the rope at that point?

A 2.0-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0.5 m above the lowest part of the slide and the spring constant is 450 N/m.What is the block’s speed when it is at a height of 0.25 m above the base of the slide? m/s (b) How far is the spring compressed? m (c) The spring sends the block back to the left. How high does the block rise? m

A 47.0 g golf ball is driven from the tee with an initial speed of 54.0 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. What is its speed when it is 9.0 m below its highest point

A railroad car of mass 3.00 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s

Two horizontal forces, 235 N and 183 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the crate.

A thin uniform rod has mass M = 0.3 kg and length L= 0.55 m. It has a pivot at one end and is at rest on a compressed spring as shown in (A). The rod is released from an angle 1= 63.0o, and moves through its horizontal position at (B) and up to (C) where it stops with 2 = 109.0o, and then falls back down. Friction at the pivot is negligible. Calculate the speed of the CM at (B).

A 70.0 kg astronaut pushed to the left of a spacecraft with a force F in gravity free space, The spacecraft has a total mass of 1.0 x 10(4)kg. During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s(2). Determine the magniture of the acceleration of the spacecraft. A 1500 kg elevator moves upward with constant spped through a veticle distance of 25m. How much work was done by the tension in the elevator cable?

In baseball, the rules specify that the ball is 23.1 in circumference with a mass of 141 . (These numbers can vary slightly.) If a pitcher throws a fastball at 31.0 , its spin typically can be 24.0 . We can reasonably model the ball as a uniform solid sphere. How much total kinetic energy has the pitcher given this ball?

Besides the gravitational force, a 3.90-kg object is subjected to one other constant force. The object starts from rest and in 1.20 s experiences a displacement of (4.30 − 3.30) m, where the direction of is the upward vertical direction. Determine the other force.

Get college assignment help at uniessay writers One billiard ball is shot east at 2.60 {rm m/s}. A second, identical billiard ball is shot west at 1.40 {rm m/s}. The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90^circ and sending it north at 1.52 {rm m/s}.

Identify and sketch all the external forces acting on the chair. Because the chair can be represented as a point particle of mass , draw the forces with their tails centered on the black dot in the middle of the chair. Be certain to draw your forces so that they have the correct orientation. Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded

a baseball thrown from the outfield is released from the shoulder height at an initial velocity of 29.4m/s at an initial angle of 30 degree with respect to the horizontal. What is the maximum vertical displacement that he ball reaches during its trajectory?

the acceleration due to gravity on the Moon’s surface is one-sixth that on Earth. An astronaut ‘s life support backpack weighs 300 lb on earth. What does it weigh on the Moon?

A 71 kg person escapes from a burning build- ing by jumping from a window 28 m above a catching net. The acceleration of gravity is 9.81 m/s2 . Assuming that air resistance is simply a constant 91 N force on the person during the fall, determine the person’s velocity just be- fore hitting the net.

If a four-engine jet accelerates down the runway at 2 m/s2 and one of the jet engines fails, how much acceleration will the other three produce?

Pete slides a crate up a ramp with constant speed at an angle of 30 degrees by exerting a 242 N force parallel to the ramp. How much waork has been done against gravity when the crate is raised a vertical distance of 2.19 m? The coefficient of friction is 0.316.

A 20.8 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole, as shown in the figure below. A cable at an angle of α=32.4° with the beam helps to support the light. Find the tension in the cable

A flat uniform circular disk (radius = 2.10 m, mass = 100 kg kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 45.0 kg person, standing 1.3 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.80 m/s relative to the ground. Find the resulting angular speed of the disk (in rad/s) rad/s

A rectangular block of ice 7 m on each side and 1.3 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3.

A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. What is the speed of the arrow as it leaves the bow?

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November 3, 2019