The fastest roller skater skated over 402 m, reaching a final velocity of 20.5 m/s. Suppose this roller skater has a mass of 61.4 kg. What is the total change in the internal energy of the skates, wheels, and ground as the skater skates past the finish line?The fastest roller skater skated over 402 m, reaching a final velocity of 20.5 m/s. Suppose this roller skater has a mass of 61.4 kg. What is the total change in the internal energy of the skates, wheels, and ground as the skater skates past the finish line?
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Physics, 21.06.2019 18:10
Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j
Answers: 2
Physics, 22.06.2019 01:30
Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz
Answers: 3
Physics, 22.06.2019 12:30
An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.
Answers: 1
The fastest roller skater skated over 402 m, reaching a final velocity of 20.5 m/s. Suppose this rol...
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