Briefly explain why there is a main sequence on the H-R Diagram
What will be an ideal response?
Models of stars show that there is a main sequence because stars support their weight by generating energy in their interiors. Gravity pulls all of the atoms in a star inward, but their weight is balanced by the outward pressure of the hot gas inside the star. The gas is heated by nuclear reactions, and the outward flow of that energy keeps each layer hot enough to support the weight pressing down on it. The main sequence is the location in the H-R diagram for stars in equilibrium, fusing hydrogen into helium.
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Multiple-Object Accelerating Systems: A 5.0-kg block and a 4.0-kg block are connected by a 0.6 kg rod, as shown in the figure. The links between the blocks and the rod are denoted by A and B. A vertical upward force of magnitude F of magnitude 150 N is applied to the upper block. What magnitude force does each of the links A and B exert?
What will be an ideal response?
A wave is described by the function y(x,t) = (3.00 cm)cos[( 3.00 m-1)x + ( 4.00 s-1)t]. What is the wavelength of this wave?
A) 2.09 m B) 3.00 m C) 0.333 m D) 0.250 m E) 1.57 m
The Sun is a G2V type star.
Answer the following statement true (T) or false (F)
The atomic nucleus contains
A) yogurt. B) protons only. C) neutrons and electrons. D) protons and neutrons. E) protons and electrons.