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An automobile has a vertical radio antenna 1.20 m long. An automobile has a vertical radio antenna 1.20 m long. The automobile travels at 65.0 km/h on a horizontal road where the Earth’s magnetic field is 50.0 ÎźT, directed toward the north and downwards at an angle of 65.0° below the horizontal. An automobile has […]

A large bed sheet is held vertically by two Your physical education teacher throws you a tennis ball at a certain velocity, and you catch it. You are now given the following choice: The teacher can throw you a medicine ball (which is much more massive than the tennis ball) with the same velocity, the […]

Gayle runs at a speed Gayle runs at a speed of 4.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back, and they continue down the […]

A man claims he can safely A man claims he can safely hold on to a 12.0-kg child in a head-on collision with a relative speed of 120-mi/h lasting for 0.10 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child. […]

A 12.0-kg object hangs in equilibrium A 12.0-kg object hangs in equilibrium from a string with a total length of L = 5.00 m and a linear mass density of Âľ = 0.001 00 kg/m. The string is wrapped around two light, frictionless pulleys that are separated by a distance of d = 2.00 m […]

Two Blocks and a Cord 1. A block of mass 5.00 kg rides on top of a second block of mass 10.0 kg. A person attaches a string to the bottom block and pulls the system horizontally across a frictionless surface, as in Figure 4.24. Friction between the two blocks keeps the 5.00-kg block from […]

Connected Objects 1. A 1. (a) A block with mass m1 = 4.00 kg and a ball with mass m2 = 7.00 kg are connected by a light string that passes over a frictionless pulley, as shown in Figure 4.23a. The coefficient of kinetic friction between the block and the surface is 0.300. Find the acceleration of the two […]

The hockey puck   Figure 4.22, struck by a hockey stick, is given an initial speed of 20.0 m/s on a frozen pond. The puck remains on the ice and slides 1.20 x 102 m, slowing down steadily until it comes to rest. Determine the coefficient of kinetic friction between the puck and the ice. […]

AMERICAN VERSUS NORTHWEST IN YIELD MANAGEMENT An example of resource mobility An example of resource mobility arose in a lawsuit involving American Airlines and Northwest Airlines. The case centered on an allegation that Northwest Airlines stole valuable information related to American’s yield management capabilities. Yield management refers to a set of practices designed to maximize […]

BUILDING BLOCKS OF SUSTAINABLE ADVANTAGE Denmark’s Lego Group possesses one of the world’s most famous brands. Founded in 1932, Lego Group sells over $1 billion of its iconic toy building blocks annually. Lego also sells children’s clothing and computer games and operates four theme parks in Europe and California. But Lego blocks could not be […]