The objective lens of a refracting astronomical telescope has a focal length of 60 cm, and the eyepiece has a focal length of 2.0 cm. How far apart should the lenses be placed in order to form a final image at infinity?
A) 60 cm B) 58 cm C) 76 cm D) 44 cm E) 62 cm
E
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The closest planet to Earth is
a. Mars. b. Venus. c. Mercury. d. Saturn.
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal and opposite to the flux through the other half of the Gaussian surface. This is
a. never true. b. never false. c. true whenever enclosed charge is symmetrically located at a center point, or on a center line or centrally placed plane. d. true whenever no charge is enclosed within the Gaussian surface. e. true only when no charge is enclosed within the Gaussian surface.
The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii
The free end of the brass rod is maintained at 0°C and the aluminum's free end is heated to 200°C. If no heat escapes from the sides of the rods, what is the temperature at the interface between the two metals? A) 76°C B) 133°C C) 155°C D) 148°C E) 92°C
The season is winter in the northern hemisphere. The Sun rises high in the sky for those living in the southern hemisphere
a. True b. False Indicate whether the statement is true or false