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?
The mass-luminosity relation exists because stars must support their weight be generating energy. Stars support their weight by generating more energy, and more massive stars have more weight to support.
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The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
Electric charge distributes itself on conducting surfaces
A) with greater concentration on more curved parts. B) such that the electric field inside is zero. C) both of the above D) none of the above
Estimate the maximum superheat temperature allowable for nucleate pool boiling of methanol.
What will be an ideal response?
Using the information in figure 1.23 what is the distance to the nearest CM in the triangle at the right?
A. 26 cm B. 20 cm C. 17 cm D. 15 CM