Objects with masses of 122 kg and 278 kg are separated by 0.379 m. A 70.9 kg mass is
placed midway between them.
278 kg
122 kg
70.9 kg
O
-0.379 m
Find the magnitude of the net gravitational
force exerted by the two larger masses on the
70.9 kg mass. The value of the universal
gravi
tational constant is 6.672 x 10-N m2/kg?
Answer in units of N.
Answer in units of N
part 2 of 2
Leaving the distance between the 122 kg
and the 278 kg masses fixed, at what distance
from the 278 kg mass (other than infinitely
remote ones) does the 70.9 kg mass experience
a net force of zero?
Answer in units of m.
Answer in units of m

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm