A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two wheels of the bicycle. The tires are inflated to a gauge pressure of 8.0 × 105 Pa and are 2.0 cm wide. 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
C
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Atomic Nucleus: In a head-on collision, an alpha particle (Z = 2) of energy 8.20 MeV bounces straight back from a nucleus of charge 80.0 e. How close were the centers of the objects at closest approach? (1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C, 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 2.81 × 10-14 m B. 3.39 × 10-12 m C. 6.56 × 10-15 m D. 2.17 × 10-14 m
Refracting Telescope: The angular magnification of a refracting telescope is 40. When the object and final image are both at infinity, the distance between the eyepiece and the objective is 143.5 cm. The telescope is used to view a distant radio tower. The real image of the tower, formed by the objective, is 6.0 mm in height. The focal point of the eyepiece is positioned at the real image. What is the focal length of the objective lens?
A. 138 cm B. 139 cm C. 140 cm D. 141 cm
_______ Force is the force that keeps an object moving on a curved path that is directed inward towards the center of a rotation.
Fill in the blank(s) with correct word
The _____ are the genetic material in a cell
A) chloroplasts B) centrioles C) lysosomes D) chromosomes