The _______________ of the solar disk is dimmer than the center, which is caused by the absorption of light in the photosphere
Fill in the blank(s) with correct word
limb
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All stars produce an absorption spectra
a. True b. False Indicate whether the statement is true or false
Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s
The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3. What is the speed of the air when it leaves the nozzle? A) 176 m/s B) 123 m/s C) 88.0 m/s D) 45.7 m/s E) 29.3 m/s
The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation" is
A) a fact. B) speculation. C) a hypothesis. D) a scientific statement. E) a theory.
Energy and Momentum: As shown in the figure, a bullet of mass 0.010 kg moving horizontally suddenly strikes a block of wood of mass 1.5 kg that is suspended as a pendulum. The bullet lodges in the wood, and together they swing upward a vertical distance of 0.40 m. The length of the string is 2.0 m. What was the speed of the bullet just before it struck the wooden block?
A. 67 m/s B. 250 m/s C. 370 m/s D. 420 m/s E. 650 m/s