(1) A high-speed railway car goes around a flat, horizontal circle of radius 400
ID: 1971032 • Letter: #
Question
(1)
A high-speed railway car goes around a flat, horizontal circle of radius 400 m at a constant speed. The magnitudes of the horizontal and vertical components of the force of the car on a 75.0 kg passenger are 211 N and 735 N, respectively.
(a) What is the magnitude of the net force (of all the forces) on the passenger?
(2)
a bicyclist travels in a circle of radius 30 m at a constant speed of 12 m/s. the bicycle –rider mass is 85 kg.
(a)what is the magnitudes of the net force on the bicycle from the road.
what is difference from those ?
i think (1)(a) is 211N ,and (2)(a) is 927 N ,isn't it?
from R.O.C Taiwan bo yu
Explanation / Answer
Resultant force =(Fx2+Fy2)
1)net force= 764.686 newton
2)required force to keep bicycle in circle fx=mv2/r=408 newton
net force=m2g2+fx2 =927.552 newton
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