A 100-kg person sits on a 5-kg bicycle. The force that the person exerts on the bicycle is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 105 Pa.
What length of each tire is in contact with the ground? A) 1.6 cm
B) 1.8 cm
C) 3.2 cm
D) 2.4 cm
E) 6.4 cm
Question 2
Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars.
B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth.
C) redshift in the light from the earliest galaxies in the universe.
D) force of gravity acting on laboratory objects.
E) redshift in the light from the explosions of distant supernovas.
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