A guarded hot plate test results in the following data:
Estimate the thermal conductivity of the test material.
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Shapley used the distribution of globular clusters in our galaxy to determine that the Sun was not at the center of the Milky Way
Indicate whether the statement is true or false
Consider a flat plate or a plane wall with a thickness L and long cylinder of radius r0. Both of these are made of materials such that they can be treated as lumped capacitances (Bi<0.1). Show that in each case, the characteristic length ? c, defined as ? c=(V/As), can be approximated as (L/2) and (r0/2) respectively.
GIVEN • Plane wall with a thickness L • Long cylinder of radius r0 • Both cylinder and plane wall can be treated as lumped capacitances (Bi<0.1) SHOW • Characteristic length can be approximated as (L/2) and (r0/2) respectively. ASSUMPTIONS • Both plane wall and cylinder can be treated as lumped capacitances
Sunspots are only about 2,000 K cooler than the much brighter photosphere
Indicate whether the statement is true or false
The spin quantum number can have values of
A) -1/2 -1, 0, +1, +1/2 B) -1/2 -1, +1, +1/2 C) -1/2, 0, +1/2 D) -1/2, +1/2.