A converging lens with two convex surfaces has a front surface with radius of curvature of 13.1 cm; the back surface has radius of curvature of 16.5 cm, and it is made from material with an index of refraction of 2.10 . What is the focal length of the lens?
a. 6.64 cm
b. 57.8 cm
c. ?57.8 cm
d. 3.48 cm
e. 30.3 cm
a
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Which of these is the likely progenitor of a type II supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses B) a contact binary, with the neutron star at 2.3 solar masses C) an evolved red giant which is just starting to make silicon in its core D) two white dwarfs in a contact binary system E) an evolved blue supergiant that is about to experience the helium flash
A wheel of diameter 0.70 m rolls without slipping. A point at the top of the wheel moves with a tangential speed 2.0 m/s
(a) At what speed is the axis of the wheel moving? (b) What is the angular speed of the wheel?
While a car travels around a circular track at constant speed, its
A) acceleration is zero. B) velocity is zero. C) both of these D) none of the above
When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.