number 59 A Sprinter A Sprinter who weighs 670 N the first 7.0 m of a race in 1.
ID: 1967878 • Letter: N
Question
number 59
A Sprinter A Sprinter who weighs 670 N the first 7.0 m of a race in 1.6s, from rest and accelerating uniformly. What are the Sprinters ( a ) speed and ( b ) kinetic energy at the end 1.6 s? ( c ) What average power does the sprinter generate during the 1.6 s interval The Queen Elizabeth 2 The liner Queen Elizabeth 2 has a - electric power plant with a maximum power of 92 MW at a speed of 32. 5 knots. What forward force is exerted on the ship at this speed? ( 1 knot = 1.852 km / h ) A swimmer moves through the water at a constant speed of 0.22 m / s. The average drag force opposing this motion is 110 N. What average power is required of the swimmer?A 1500 kg automobile from rest on a horizontal road and gains a speed of 72 km / h in 30 s. ( a ) What is the kinetic energy of the auto at the end of the 30 s? ( b ) What is the average power required of the car during the 30 s interval ? ( c ) What is the power at the end of the 30 s interval, assuming that the acceleration is constant? A locomotive with a power capability of 1.5 MW can accelerate a train from a speed of 10 m / s to 25 m / s in 6.0 min. ( a ) Calculate the mass of the train. Find ( b ) the speed of the train and ( c ) the force accelerating the train as functions of time ( inExplanation / Answer
a. the acceleration and distance relation is, x=at^2/2 a=5.468 m/s^2 speed is =at=8.75 m/s his mass m=670/g=67 kg b. kinetic energy mv^2/2=2564.8 J c. average power=(2564.8+0)/1.6=1603 W
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