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A box of books is initially at rest a distance D = 0.367 m from the end of a wooden board. The coefficient of static friction between the box and the board is µs = 0.379, and the coefficient of kinetic friction is µk = 0.303. The angle of the board is increased slowly, until the box just begins to slide; then the board is held at this angle. Find the speed of the box as it reaches the end of the board.
A railroad car of mass 3.3 104 kg moving at 4.50 m/s collides and couples with two coupled railroad cars, What is the speed of the three coupled cars after the collision
A fire truck connects their hose (radius r1 = 5 cm) to a fire hydrant. The underground water lines have a radius of r2 = 15 cm, How high above the end of the hose will the water reach
A grandfather clock is controlled by a swinging brass pendulum thatis 1.0 m long at a temperature of30.°C. What is the length of the pendulum rod when the temperature drops to 0.0°C
A balsa-wood raft has the following dimensions: L=2.34m , W= 1.35m , H= 0.65m. if the mass of an average person is 72.5kg, how many people can the raft safely support
q1. a 0.270 kg block on a vertical spring with a spring constant of 5.00 x 103 nm is pushed downward compressing the
A ball is thrown vertically upward with a speed of 1.63m/s from a point 4.21m above the ground. What is the time at which it will reach the ground.
Motor oil with a viscosity of 0.250 Ns/m^s is flowing through a tube that has a radius of 3.00 mm and is 1.00 m long. What is the average speed of the oil
A spring is compressed by 0.0612 m and is used to launch an object horizontally with a speed of 1.64 m/s.at what angular frequency (in rad/s) would it oscillate
A parallel-plate air-filled capacitor having area 51cm2and plate spacing 1.0 mm is charged to a potential differenceof 670 V. calculate the energy density between the plates
A capacitor with air between its plates is charged to 130 V and then disconnected from the battery. Whena piece of glass is placed between the plates, the voltage acrossthe capacitor drops to 25 V. What is the dielectric constant of the glass?
a chain of mass m forming a circle of radius r is slipped on a smooth round cone with half-angle theta. find the
A bird stands on a dc electric transmission line carrying 2500 A, What is the potential difference between the bird's feet
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