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A 1.6kg wood block is pulled along a wood floor at a steady speed. A second wood block, with mass 4.2kg , is attached to the first by a horizontal string. What is the magnitude of the force pulling on the first block?
Bob throws a 500 g rock at 25 m/s, moving his hand through 1.0 m as he accelerates it from rest. Write Newton's 2nd Law for Bob and the rock
a rock thrown with speed 7.50 and launch angle 30.0 above the horizontal travels a horizontal distance of 19.5 before
A solid sphere with a radius of 0.70 m can be rotated about an axis through its center by a torque of 10.5 N *m which accelerates it uniformly from rest through a total of 180 revolutions in 15.0 s
A dolphin in seawater at a temperature of 25 °C makes a chirp. How much time passes before it hears an echo from the bottom of the ocean, 208 m below.
A wrecking ball (weight = 5010 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3670 N. As the drawing shows, a support cable runs from the top of the boom to the tractor.
Consider an electron moving with a speed of 8.60 106 m/s at right angles to a constant magnetic field, with B = 1.9 T
A hollow, conducting sphere with an outer radius of 0.253m and an inner radius of 0.190m has a uniform surface charge density of +6.64×10?6 C/m^2. What is the electric flux through a spherical surface just inside the inner surface of the sphere
Tarzan has foolishly gotten himself into another scrape with the animals and must be rescued once again by Jane. What is Jane's (and the vine's) angular speed
Calculate the frequency of the tone perceived by the person if he is moving away from the speaker with a speed of 48 m/s
A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book
A square, perfectly reflecting surface is oriented in space to be perpendicular to the light rays from the Sun, What is the radiation force on the surface from the light rays
A 54.1-kg ice skater is standing at rest on a frozen lake. The friction between his skates and the surface of the ice is negligible. what is the magnitude of his recoil velocity
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