Relate bipolar jets to the T-Tauri phase and Herbig-Haro objects
What will be an ideal response?
As the protostar condenses and spins in stages 2-3, it forms a dusty disk around its equator, where planets may later be formed. When the protostar enters the T- Tauri phase it becomes much more active and develops a powerful solar wind. But its magnetic field directs this solar wind outward in the polar regions, with hot jets blowing out at high speeds perpendicular to the dusty disk. When these jets hit the cooler clouds around them, the shock wave forms the Herbig-Haro objects that can span more than a light-year across.
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Studies of solar vibrations have revealed that
A) the Sun vibrates only on the surface. B) neutrinos from the solar core reach the solar surface easily. C) the Sun generates energy by nuclear fusion. D) they are caused by processes similar to those that create earthquakes. E) our mathematical models of the solar interior are fairly accurate.
A 1.0-?F and a 2.0-?F capacitor are connected in series across a 3.0-V voltage source
(a) What is the charge on the 1.0-?F capacitor? (b) What is the voltage across the 2.0-?F capacitor?
Energy Conservation With Nonconservative Forces: A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s when it separates from the spring, as shown in the figure. The block descends a ramp and has a velocity v1 = 1.4 m/s at the bottom of the ramp. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.26. The block moves on to D, where it stops. By how many centimeters was the spring initially compressed?
width="576" /> A. 0.49 cm B. 0.26 cm C. 0.18 cm D. 0.99 cm E. 0.67 cm
On a warm day a pool of water transfers energy to the air as heat and freezes. This is a direct violation of:
A. the zeroth law of thermodynamics B. the first law of thermodynamics C. the second law of thermodynamics D. the third law of thermodynamics E. none of the above