The range of wavelengths for the "water hole" is ________ cm
Fill in the blank(s) with correct word
18-21
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A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?
A) 110 m/s2 B) 220 m/s2 C) 800 m/s2 D) 880 m/s2 E) need more information
A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. (a) What is the resistance of the wire? (b) What is the resistivity of the material from which the wire is made?
What will be an ideal response?
What happens to the rotation of a molecular cloud as it collapses to form a star?
A) The rotation rate remains the same and results in stellar rotation. B) The rotation dissipates and any residual is left in small overall rotation of the star. C) The rotation rate increases and results in fast rotation of the star. D) The rotation rate increases and results in a flattened disk of material around a protostar. E) The rotation increases the speed of collapse and produces more massive stars.
A heterogeneous mixture is a combination of two of
more substances that a) have a large amount of solute dissolved in a given solvent. b) are composed of atoms all having the same number of protons in their nucleus. c) appear nonuniform throughout any sample. d) are combined chemically in a fixed ratio by mass. • •