A 1.0-kg wood block is pressed against a vertical wood wall by a 12-N force as shown in the figure. (Use µs=0.5 for wood on wood.) If the block is initially at rest, will it move upward, move downward, or stay at rest?
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A 1.00 kg aluminum block and a 7.00 kg copper block are connectedby a light string over a frictionless pulley. The two blocks areallowed to move on a fixed steel block wedge (of angle ? = 35.0°)as shown in the figure below.Making use of the table below, determine the following.(a) the acceleration of the two blocks____________________. m/s2(b) the tension in the string_______________________.NCoefficients of Frictiona µs µkSteel on steel 0.74 0.57Aluminum on steel 0.61 0.47Copper on steel 0.53 0.36Rubber on concrete 1.0 0.8Wood on wood 0.25-0.5 0.2Glass on glass 0.94 0.4Waxed wood on wet snow 0.14 0.1Waxed wood on dry snow - 0.04Metal on metal (lubricated) 0.15 0.06Ice on ice 0.1 0.03Teflon on Teflon 0.04 0.04Synovial joints in humans 0.01 0.003a All values are approximate.
A 15.0-g bullet traveling 213 m/s in a vertical direction buries itself in a 2.40kg block of wood at rest directly above it in a completely inelastic collision. as a result, the bullet/block combination moves vertically upward. (a) determine the velocity of the bullet/block combination after impact. (b) determine the maximum height reached by the bullet/block combination. (c) Is kinetic energy conserved in this collision? why or why not?
