A converging lens with two convex surfaces has a front surface with radius of curvature of 10.0 cm; the back surface has radius of curvature of 30.0 cm, and the lens is made from material with an index of refraction of 2.50 . What is the focal length of the lens?
a. -13.3 cm
c. 5.00 cm
b. 4.44 cm
d. 0.250 cm
C
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For main-sequence stars, which of the following is true about low-mass stars compared to high-mass stars?
A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.
In a supermarket, you place a 22.3-N (around 5 lb) bag of oranges on a scale, and the scale starts to oscillate at 2.7 Hz. What is the spring constant of the spring of the scale?
A) 650 N/m B) 600 N/m C) 330 N/m D) 820 N/m E) 410 N/m
How do most craters on moons form?
A. by tectonic activity B. impact of asteroids C. running water D. by volcanic activity E. earthquakes
Which moon of Saturn has the surface with the widest range of ages? Why?
What will be an ideal response?