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A box of negligible mass rests at the left end of a 2.06-m, 26.5-kg plank (seefigure). The width of the box is w = 68.9 cm, and sand is to be distributeduniformly throughout it. The center of gravity of the nonuniformplank is x = 47.0 cmfrom the right end. What mass of sand should be put into the box sothat the plank balances horizontally on a fulcrum placed just belowits midpoint? (The origin is at the fulcrum and +x to the right.)
A whale swims due east for a distance of 5.1 km, turns around and goes due west for 6.1 km, What is the total distance traveled by the whale
A person of mass 75kg stands at the center of a rotating merry-go-round platform of radius 3.5mand moment of inertia 920kg?m2. compute the angular velocity when the person reaches the edge
A sphere with mass 2.5 kg and a radius of .50 meter startsrotating from rest and has a constant angular acceleration of 2.5radians/second squared. Determine the torque required to produce this motion
Now, a second resistor R2 of 3.2x10^5 ? is connected in parallel to the existing resistor in the circuit, and a second capacitor C2 = 4.20 µF is connected to the existing capacitor in parallel. What will be the new time constant
An occupant of a car has a chance of surviving a crash if the deceleration all through the crash is not more than 30.00 g. Approximation the force on a 72 kg person decelerating at this rate.
High-speed photos of a 220 microg flea jumping vertically indicate that the jump lasts 1.2 ms, What is the flea's change in momentum during its jump
If the coefficient of friction between the sled's runners and snow is 0.055 and the boy and sled together weigh 540 N, how far does the sled travel on the level surface before coming to rest
A 0.21-kg pinecone falls 10 m to the ground, where it lands with a speed of 12 m/s. How much work was done on the pine cone by air resistance
A plank 2.00 cm thick and 12.9 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
A rocket blasts off and moves straight upward from the launch pad with a constant acceleration. After 3.0 seconds the rocket is at a height of 77 m. what is its the speed at this time
A 45.8-kg girl is standing on a 161-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. What is the velocity of the plank relative to the ice surface
king arthurs knights fire a cannon from the top of the castle wall. the cannonball is fired at a speed of 52 ms and at
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