The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. The minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image is
A. 1.
B. 2.
C. 3.
D. 4.
E. 5.
Answer: C
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An aluminum fin is attached at both ends in a compact heat exchanger as shown. For the situation shown, determine the temperature distribution and the heat transfer through the fin.
What will be an ideal response?
LR Circuits: The figure shows a circuit. The ideal battery has a constant terminal voltage of ? = 27 V, the inductance is L = 0.40 H, and the resistances are R1 = 12 ? and R2 = 9.0 ?. Initially the switch S is open with no currents flowing. Then the switch is suddenly closed.(a) What is the current in the resistor R1 the instant after the switch is closed?(b) After leaving the switch has been closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Fill in the blank(s) with the appropriate word(s).
A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope?
A) zero B) 400 N C) 600 N D) 800 N E) none of the above
The spiral structure of the Milky Way is best revealed by ________ cm radio observations of hydrogen atoms
Fill in the blank(s) with correct word