Problem 73. 74. Consider a train that rounds a curve with a radius of 570 m at a speed of 160 km/h (approximately 100 mi/h). (a) Calculate the friction force needed on a train pas- senger of mass 55 kg if the track is not banked and the train does not tilt. (b) Calculate the friction force on the passenger if the train tilts at an angle of 8.0° toward the center of the curve.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter5: More Applications Of Newton’s Laws
Section: Chapter Questions
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Problem 75.
74. Consider a train that rounds a curve with a radius of
570 m at a speed of 160 km/h (approximately 100 mi/h).
(a) Calculate the friction force needed on a train pas-
senger of mass 55 kg if the track is not banked and the
train does not tilt. (b) Calculate the friction force on
the passenger if the train tilts at an angle of 8.0° toward the
center of the curve.
75. Two equal-mass stars maintain a constant distance apart
of 8.0 x 10" m and revolve about a point midway between
them at a rate of one revolution every 12.6 yr. (a) Why
don't the two stars crash into one another due to the
85.
gravitational force between them? (b) What must be the
mass of each star?
Transcribed Image Text:Problem 75. 74. Consider a train that rounds a curve with a radius of 570 m at a speed of 160 km/h (approximately 100 mi/h). (a) Calculate the friction force needed on a train pas- senger of mass 55 kg if the track is not banked and the train does not tilt. (b) Calculate the friction force on the passenger if the train tilts at an angle of 8.0° toward the center of the curve. 75. Two equal-mass stars maintain a constant distance apart of 8.0 x 10" m and revolve about a point midway between them at a rate of one revolution every 12.6 yr. (a) Why don't the two stars crash into one another due to the 85. gravitational force between them? (b) What must be the mass of each star?
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