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You throw a rock from the upper edge of a 80.0-m vertical dam with a speed of 25.0 m/s at 65.0°° above the horizon.
1) How long after throwing the rock will you see it hit the water? (Neglect any effects due to air resistance.) (Express your answer to three significant figures.)
2) How far from the bottom of the dam does the rock land? (Neglect any effects due to air resistance.) (Express your answer to three significant figures.)
A batter strikes a baseball moving horizontally towards him at 15 m/s. the ball leaves the bat horizontally at 24 m/s, determine the change in velocity of the ball
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You have a pulley 13.1 cm in diameter and with a mass of 2.0 kg. You get to wondering whether the pulley is uniform. What is the actual moment of inertia of the pulley
A box slides across a frictionless floor with an initial speed v = 3.4 m/s. It encounters a rough region where the coefficient of friction is µk = 0.5. with what speed does the box leave the strip
Two identical clocks are synchronized. One is then put in orbitdirected eastward around the Earth while the other remains on the Earth. Which clock runs slower? When the moving clock returns tothe Earth, are the two still synchronized?
Andy (mass 77kg ) uses a 2.7m -long rope to pull Bob (mass 61kg ) across the floor (μk=0.20) at a constant speed of 1.0m/s. What is the mass of the rope
The image of a tree on a 35 mm color slide is 1.3 mm high. It is to be projected onto a screen 7 m from the slide, and is to appear 602 mm high. What focal length lens (in meters) is needed
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A cell has 2000 users who generate an average busy-hour traffic of 2.5 mE each. How many channels are needed to serve these users with blocking probability no greater than 4%?
A Michelson interferometer is illuminated with monochromatic light. Evaluate the wavelength of the light
two wires a and b are of equal length. each is attached at one end to the ceiling and to a weight at the other end. the
A 4 kg mass is connected to a spring (k = 730 N/m) platform which undergoes simple harmonic motion in the vertical direction. The amplitude of the oscillation is 5 cm. At t=0 the box is 5 cm above the equilibrium position.
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