Posts by mightymouse
Total # Posts: 12
An American football game has been canceled because of bad weather in Cleveland, and two retired players are sliding like children on a frictionless ice-covered parking lot. William 'Refrigerator' Perry, mass 162 kg, is gliding to the right at 7.73 m/s, and Doug Flutie...
April 6, 2009
A reel has radius R and moment of inertia I. The reel is positioned at the top of a slope and a block is also on the slope with some angle theta. One end of the block of mass m is connected to a spring of force constant k, and the other end is fastened to a cord wrapped around...
March 31, 2009
The mass of the blue puck shown below is 10.0% greater than the mass of the green one. Before colliding, the pucks approach each other with momenta of equal magnitudes and opposite directions, and the green puck has an initial speed of 8.0 m/s. Find the speeds of the pucks ...
March 23, 2009
A rod of length 39.0 cm has linear density (mass-per-length) given by the following equation, where x is the distance from one end. ë = 50.0 g/m + 21.0x g/m2 (a) What is its mass? (b) How far from the x = 0 end is its center of mass? I think you would plug in the 39cm for...
March 22, 2009
well wouldn't the force needed to submerge them just be the buoyant force? and to get that all you do is take the density*volume*accerlaration due too gravity and then i'm not sure exactly how to get how far theym sink. i think it's something to do with net force. ...
March 12, 2009
Compute the force needed on the following shapes to completely submerge them in water for each of these materials: oak of average density, Styrofoam, and hollow aluminum with a 0.5cm wall thickness. A cube 10cm on a side, a cylinder 5cm long and 9cm in diameter, a sphere 15cm ...
March 12, 2009
Three forces acting on an object are given by F1 = ( 1.95i - 1.60j ) N, F2 = ( - 4.50i - 3.25j ) N, and F3 = ( 46.0j ) N. The object experiences an acceleration of magnitude 3.85 m/s2 (a) What is the direction of the acceleration? (b) What is the mass of the object? (c) What ...
March 5, 2009
A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 38.5° north latitude? Assume that the Earth is spherical
March 5, 2009
A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light, frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 200 N/m. The spring is unstretched when the 30.0 kg block is 20.0 cm above the...
March 3, 2009
A 10.0 kg block is released from point A in the figure below. The track is frictionless except for the portion between points B and C, which has a length of 6.00 m. The block travels down the track, hits a spring of force constant 2350 N/m, and compresses the spring to 0.250 m...
March 1, 2009