A(n) ____ is a single conjecture that can be tested
a. hypothesis
b. paradigm
c. natural law
d. model
e. theory
A
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Equilibrium: A 30.0-kg load is being held in place using massless wires in the ideal pulley arrangement shown in the figure. What is the magnitude of the force F?
Fill in the blank(s) with the appropriate word(s).
Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?
A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder.
Most extrasolar planets are hot Jupiters, discovered in the infrared by the Spitzer Space telescope
Indicate whether the statement is true or false
The rate of energy flow per unit area of an electromagnetic wave has an average value of 0.695 W/m2
The wave is incident at right angles upon a rectangular area measuring 1.5 m by 2.0 m. How much total energy falls upon this rectangle each minute? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s) A) 130 J B) 220 J C) 190 J D) 160 J E) 250 J