A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
a. 20
b. 30
c. 40
d. 10
e. 50
c
Physics & Space Science
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Of the following systems, which contains the most heat?
a. 100 kg of water at 80°C c. 600 kg of ice at 0°C b. 250 kg of water at 40°C d. Systems do not contain heat.
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A weathering process that involves the buildup of salts on rock surfaces through evaporation where these salts weaken the cements that bond the rocks so that they break is
What will be an ideal response?
Physics & Space Science
Explain why the lines of force never cross one another. (Hint: Consider the direction of a magnetic line of force.)
Physics & Space Science
An object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 0.25 cm B) 15 cm C) 4.0 cm D) 2.4 cm E) 1.3 cm
Physics & Space Science