Bicyclist has a tangential speed of 13.5m/s. Radius is 48.9 m. magnitude of force maintaing motion is 380 N. What is combined mass? Help please
2007-12-09 06:07:42 · 2 answers · asked by allda_jedi8472 1 in Science & Mathematics ➔ Physics
F = m v² / r
380 N = m ( 13.5 m/s )² / 48.9 m
Solve for the mass m.
2007-12-09 07:23:57 · answer #1 · answered by jgoulden 7 · 0⤊ 0⤋
The mass cannot be determined from the data given.
The energy output rate of the cyclist is F*V = 380N*13.5m/s = 5130 watts. (A unit of POWER)
This number has no relationship to the kinetic energy of the bike/rider combination, KE = ½mV². (A unit of ENERGY) Rather, it is the constant power needed to overcome the combination of wind resistance and gravitational thrust or drag at the specified speed.
2007-12-09 17:30:31 · answer #2 · answered by Steve 7 · 0⤊ 0⤋