If you find you are able to move a positive charge from infinity (far away) to a particular point without doing any work, can you infer that no other charges are nearby?
What will be an ideal response?
NO. For example, consider 2 rows of opposite charge. If you had moved half way between the charges, no work would have been done.
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Which of the following are in order of decreasing temperature?
A) O9, F2, F7, G2, K0 B) K0, G2, F7, F2, O9 C) F7, F2, O9, K0, G2 D) O9, F7, F2, G2, K0
A pattern of dark lines on a continuous background is referred to as
A) an emission line spectrum B) an absorption line spectrum C) a continuous spectrum D) a dark spectrum
To more accurately model the energy input from the sun, suppose the absorbed flux in given by qabs (t) = t (375 – 46.875 t) where t is in hours and qabs is in W/m2. (This time variation of qabs gives the same total heat input to the wall i.e., 2000 W hr/m2). for qabs in place of the constant value of 500 W/m2. Explain your results. A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of
–15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room. GIVEN • Trombe wall with specified absorbed solar flux as a function of time FIND (a) Maximum temperature in the wall after 4 hours (b) Heat input to the room
What is the longest-lasting internal heat source responsible for geological activity?
a. accretion b. radioactive decay c. sunlight