A camera is used to photograph the full moon, which has an angular diameter of 0.53°. The image on the film is 2.3 mm in diameter. What is the focal length of the lens?
a. 2.3 mm
b. 500 mm
c. 250 mm
d. 790 mm
e. 25.5 mm
c
Physics & Space Science
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In ductile cast iron, the carbon is in the form of _________rather than as iron carbide.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Which of the following particles will repel one another?
A. a neutron and a negative ion B. a proton and an electron C. a negative ion and an electron D. a neutron and a neutron
Physics & Space Science
Most of Mars' water is now locked in a ________ layer below the surface
Fill in the blank(s) with correct word
Physics & Space Science
If CP for an ideal gas is 35.4 J/mol/K, which of the following is CV for this gas?
a. 12.5 J/mol/K b. 20.8 J/mol/K c. 29.1 J/mol/K d. 27.1 J/mol/K e. 43.4 J/mol/K
Physics & Space Science