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Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m2 and the density of air is 1.2 kg/m3.Express your answer to two significant figures and include the appropriate units.
A 878 kg car has four 11.8 kg wheels. When the car is moving, what fraction of the total kinetic energy of the car is due to rotation of the wheels about their axles
A total of 26 bright and 26 dark Newton's rings (not counting dark spot at the center) are observed when 540 light falls normally on a planoconvex lens resting on a flat glass surface.How much thicker is the center than edges.
A hydrogen molecule with an initial velocity of 1200m / s makes a collision with a molecule of oxygen at rest. The reason for the masses of molecules is mO / mH = 16. What are the speeds of the molecules after collision.
A pirate ship is 560m from a fort defending the harbor entrance of an island. How far should the pirate ship be from the cannon
A 3 kg block moving at 4 m/s makes a head-on elastic collision with a stationary block of mass 2 kg. Use coservation of momentum and the fact that the relative speed of recession equals the relative speed of approach to find the velocity of each bloc..
A cable used to lift heavy materials like steel I-beams must be strong enough to resist breaking even under a load of 2.2 x 106 Newton. Evaluate what cross-sectional area should the cable have if it's to be made of steel
An object is located 13.5 cm in front of a convex mirror, the image being 7.40 cm behind the mirror. A second object, twice as tall as the first one, is placed in front of the mirror, however at a dissimilar location. The image of this second object ..
A cardinal (Richmondena cardinalis) of mass 3.80×10^?2 kg and a baseball of mass 0.145g have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
three electrons are located at the vertices of an equilateral triangle, one at each vertex. what is the magnitude of the net electrostatic force on each electron
A man drinks a bottle of beer and proposes to work off its460kj by exercising with 20 kg barbell. how many times must he lift the barbell
Two flat surfaces are exposed to a uniform, horizontal magnetic field of magnitude 0.52 T. Calculate the area of the first surface
A 3.80 kg block is pushed along the ceiling with a constant applied force of 85.0 N that acts at an angle of 55.0° with the horizontal, Determine the coefficient of kinetic friction between block and ceiling
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