Why is it so difficult to observe the planet Mercury from Earth?
What will be an ideal response?
Mercury is so close to the Sun that from our perspective here, on Earth, it never strays far from the Sun's position, so it is difficult to find in the night sky.
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A jar of peanut butter costs $3.29. Express its price in dekadollars and decidollars
A) 0.329 dekadollars; 0.329 decidollars B) 32.9 dekadollars; 0.329 decidollars C) 329 dekadollars; 32.9 decidollars D) 0.329 dekadollars; 32.9 decidollars E) 32.9 dekadollars; 329 decidollars
The sidereal drive of a telescope mounting must turn the telescope
a. southward about the polar axis. b. eastward about the polar axis. c. westward about the polar axis. d. northward about the polar axis. e. None of the other choices are correct.
A rod with a diameter of 2.00 mm projects 20.0 mm horizontally outward from a wall. A 2.00 N coat is hung from the end of the rod and the rod deflects downward by 
The shear stress of the rod is
a. 
b. 
c. 
d. 
e. 
Which of the following statements about the moons of the jovian planets is not true?
A) Some of the moons are big enough that we'd call them planets (or dwarf planets) if they orbited the Sun. B) One of the moons has a thick atmosphere. C) Many of the moons are made largely of ices. D) Most of the moons are large enough to be spherical in shape, but a few have the more potato-like shapes of asteroids.