Which law of thermodynamics is a restatement of the conservation of energy as it applies to thermal systems?
A) First law
B) Second law
C) Third law
D) all of the above
Answer: A
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Estimate the time required to heat the center of a 1.5-kg roast in a 163°C oven to 77°C. State your assumptions carefully and compare your results with cooking instructions in a standard cookbook.
GIVEN
FIND
The time required to heat the roast
ASSUMPTIONS
SKETCH
Why are massive stars more luminous than low mass stars? That is, why is there a mass-luminosity relation?
What will be an ideal response?
Jupiter and the other jovian planets are noticeably oblate because
A) their powerful gravity acts stronger on the closer poles than the distant equator. B) they are fluid bodies that are spinning rapidly. C) they are tidally distorted by the pulls for their satellite systems. D) they all have strong magnetic fields that deform their shape. E) All of the above are correct.
Suppose we use optical radiation (l = 500 nm) to determine the position of the electron to within the wavelength of the light. What will be the resulting uncertainty in the electron's velocity?