Find magnitude of average force exerted by racket
In a tennis serve, a 7.8×10-2 kg ball can be accelerated from rest to 36 over a distance of 0.76 m/s. Find the magnitude of the average force exerted by the racket on the ball during the serve.
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The acceleration of gravity is 9.8 m/s2. If the object's speed reaches one-half its terminal speed in 7.006 s, determine the terminal speed.
On a workday the average decibel level of a busy street is 65 kb, with 121 cars passing a given point every minute. If the number of cars is reduced to 33 cars every minute on a weekend, what is the decibel level of the street?
A hollow aluminum cylinder 20.0 cm deep has an internal capacity of 2.000 L at 20.00C. It is completely filled with turpentine and then warmed to 80.00C. (a) How much turpentine overflows? (b) If it is then cooled back to 20.00C, how far below the
A 26 kg loudspeaker is suspended 3.0 m below the ceiling by two cables that are each 20 degrees from vertical. What is the tension in the cables?
Determine the fractional decrease in the rod's length using the formula above, where L0,Silver and L0,Gold are the initial lengths of the silver and gold rods. (See Table 12.1 for appropriate constants.)
Water flowing out of a 16.0 mm-diameter faucet fills a 1.50 L bottle in 7.00 s. At what distance below the faucet has the water stream narrowed to 10 mm diameter?
An elevator and its load have a combined mass of 1400 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 12 m/s, is brought to rest with constant acceleration in a distance of 47 m.
If a person radiates about 65 W of power at room temperature, how long does it take for a person to radiate away the energy acquired by consuming a 230 Calorie donut?
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