Both please help 83. A train traveling at a constant speed rounds a curve ofradius 215 m. A lamp suspended from the ceiling swingsout to an angle of 16.5° throughout the curve. What is thespeed of the train?84. The Sun revolves around the center of the Milky Way Galaxy(Fig. 5–49) at a distance of about 30,000 light-years fromthe center (1 ly = 9.5 × 105 m). If it takes about 200 mil-lion years to make one revolution, estimate the mass of ourGalaxy. Assume that the mass distribution of our Galaxyis concentrated mostly in a central uniform sphere. If all thestars had about the mass of our Sun (2 × 1030 kg), howmany stars would there be in our Galaxy?Sun30,000 lyFIGURE 5–49 Edge-on view of our galaxy.Problem 84.

Part (83) Given: The radius of the curve is 215 m. The angle made by the lamp is 16.5o.

83. A train traveling at a constant speed rounds a curve of radius 215 m. A lamp suspended from the ceiling swings out to an angle of 16.5° throughout the curve. What is the speed of the train? 84. The Sun revolves around the center of the Milky Way Galaxy

83. A train traveling at a constant speed rounds a curve of radius 215 m. A lamp suspended from the ceiling swings out to an angle of 16.5° throughout the curve. What is the speed of the train? 84. The Sun revolves around the center of the Milky Way Galaxy

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter11: Particle Physics And Cosmology

Section: Chapter Questions

Problem 83CP: Assuming a circular orbit for the Sun about the center of the Milky Way Galaxy, calculate its...

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Question

Both please help

83. A train traveling at a constant speed rounds a curve of
radius 215 m. A lamp suspended from the ceiling swings
out to an angle of 16.5° throughout the curve. What is the
speed of the train?
84. The Sun revolves around the center of the Milky Way Galaxy
(Fig. 5–49) at a distance of about 30,000 light-years from
the center (1 ly = 9.5 × 105 m). If it takes about 200 mil-
lion years to make one revolution, estimate the mass of our
Galaxy. Assume that the mass distribution of our Galaxy
is concentrated mostly in a central uniform sphere. If all the
stars had about the mass of our Sun (2 × 1030 kg), how
many stars would there be in our Galaxy?
Sun
30,000 ly
FIGURE 5–49 Edge-on view of our galaxy.
Problem 84.

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