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A wooden board that is 50 cm long, 20 cm long, and 4 cm thick is floating in water. Rocks are then carefully placed on the top face of the board until the top of the wood just slips below the water surface. The density of water is 1000 kg/m^3 and the density of the wood is 600 kg/m^3. What is the total mass of the rocks?
A 100 arrow is shot vertically from a bow whose efficient spring constant is 500. If the bow is drawn 75 before shooting the arrow, to what height does the arrow rise .
If the mass of both weights is 175gm, the first mass is located 20 north of east, the second mass is located 20 south of east, and the transducer sensitivity is 0.5volts/Newton, how large a voltage do you expect to measure? Imagine the transducer ..
Old naval ships fired 14 kg cannon balls from a 250 kg cannon. It was very important to stop the recoil of the cannon, since otherwise heavy cannon would go careening across the deck of the ship. In one design, a large spring with spring constant 2..
A ship's anchor weighs 5000 N. Its cable passes over a roller of negligible mass and is wound around a hollow cylindrical drum of mass 380kg and radius 1.10m. The drum is mounted on a frictionless axle. The anchor is released and drops 16 m to water.
The gravitational force between two electrons that are 0.97 m apart is 5.76 multiplied by 10-71 N. Find out the mass of an electron. (Use G = 6.67 10-11 N · m2/kg2.)
In soccer, a speed record was set for kicking a soccer ball at 43m/s. If the soccer player kicked the ball from ground level at an angle of 30° from the horizontal, what would be the flight time of the soccer ball? Assume that air resistance is ne..
A string under a tension of 47.00N is used to whirl a rock in a horizontal circle of radius 2.60 m at a speed of 21.0 m/s. The string is pulled in and the speed of the rock increases.
What is the force exerted on beam by the fixture P (P is where the beam is attached horizontally to the brick wall) at the wall (magnitude and direction).
An underwater diver sees the sun 50 degrees above horizontal. How high is the sun above the horizon to a fisherman in a boat above the driver.
After going through a bad break-up with your significant other you end up drinking half a case of beer. The next day you decide the cloud of despair must be fought with exercise. How much longer will it take you to burn off the calories of the bee..
A rectangular container measuring 10cmx20cmx25cm is filled with gas. What is the mass volume of water in kilograms.
Calculate the size of the average force. plan the force vectors with their tails at the left sphere
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