Contrast the sizes of molecular clouds with emission nebulae
What will be an ideal response?
The emission nebula are only a few light years across, limited to those regions made hot enough to glow visibly by OB associations like the Orion Nebula. The giant molecular clouds are often hundreds of light years across, vast cold star forming regions that only occasionally are lit up enough to show hot spots like M-42 or other emission nebula, which are the tips of these cosmic icebergs.
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A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
An astronomer records the spectrum of light coming from a distant star. Describe what information the astronomer can deduce from this stellar spectrum, and what physical principles she would apply
What will be an ideal response?
Earth's rotation axis ____________________ slowly so that in a few thousand years Polaris will no longer be the North Star
Fill in the blank(s) with correct word
Daisy weighs 120 N and carries Trixie who weighs 40 N on her back. The support force on Daisy's feet is
A) 40 N. B) 120 N. C) 160 N. D) more than 160 N.