Question

g How many rpm would a 25 m diameter Ferris wheel need to travel if a 75 kg person were to experience an effective weight of 810 N at the lower-most point of the ride

Answer 1

2.52 rpm

Step-by-step explanation:

given that

diameter of the wheel, d = 25 m

Mass of the person, m = 75 kg

Weight experienced, N = 810 N

Since diameter is 25, radius then is 25/2 = 12.5 m

We all know that,

v = rw

Also, the passengers weight is equal to the centripetal acceleration, and thus

mg = mv²/r

Substitute for v, we have

mg = m/r * (rw)²

mg = mr²w²/r

g = rw²

If we make w the subject of formula, we have

w² = g/r

w = √(g/r)

mg = 810

75 * g = 810

g = 810 / 75

g = 1.08 m/s²

w = √(g/r)

w = √(1.08 / 12.5)

w = √0.0864

w = 0.294 rad/s

Since the question asked us in rpm, we convert to rpm

0.294 * (60 / 2π)

2.52 revolution per minute.