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The best earphones. You are writing an article for a consumer magazine based on a survey of the magazine's readers that asked about satisfaction with inexpensive earphones for the iPod. Of 1317 readers who reported owning the Apple iPod earphones, 237 gave it an outstanding rating. Only 25 outstanding ratings were given by the 43 readers who owned Sennheiser sports earphones. Describe an appropriate variable, which can be computed from these counts, to measure high satisfaction with a make of earphone. Compute the rates of high satisfaction for the Apple iPod and Sennheiser sports earphones. Which brand has the better high-satisfaction rating?
An originally uncharged 10-μF capacitor is charged by a10-V battery during a resistance R. The capacitor reaches a potential difference of 4 V in a period of 3 s after charging began. Find the value of R.
A platform is rotating at an angular speed of 2.5 rad/s. A block is resting on this platform at a distance of 0.34 meter from the axis. obtain the smallest distance from the axis at which the block can be relocated and still remain in place as the ..
When it rains water vapour in the air condenses into liquid water and energy is released. How much energy is released when 0.0244m of rain falls over an area of 2.59 x 10^6 m^2? If the average energy needed to heat one home for a year is 1.40 x 10^11..
A roller coaster is pulled up a hill of height 95m before being released to coast down a ramp that is inclined at 56 degrees above the horizontal. find the magnitude of average frictional force on the car
In a chase scene, a movie stuntman is supposed to run right off flat roof of one city building and land on another roof 1.7m lower. If the gap between the buildings is 4.4m wide, how fast must he run.
A bathroom scale measures the normal force being exerted down on it. A box of mass 9.2kg sits on a bathroom scale that reads 6.2N. What is the tension (in Newtons) in the cable attached to the top of the box
A body C of mass m=8 kg, initially at rest, slides without friction along the surface of a block B, Calculate the acceleration of the body C with respect to the block B
A young boy with a broken leg is undergoing traction. What is the magnitude of the force exerted on the femur by the lower leg
A 1.59 kg block slides on a frictionless, horizontal surface with an speed of 1.54 m/sec. How long is the block in contact with the spring before it comes to rest
About 0.1eV is required to break a hydrogen bond in a protein molecule, what is the minimum frequecy that the radiation can have to accomplish that?
Frictional torque is 2.3 Nm. Using both force and energy methods, determine the number of revolutions made by the wheel in coming to rest. Also determine the time taken (in minutes).
Two waves of the same frequency have amplitudes 1.31 and 2.94. What is the resultant amplitude
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