Which of the following was NOT a contribution made by the Greeks in the development of modern science?
A) The willingness to challenging new ideas
B) The use of mathematics to explore new ideas
C) The willingness to discard ideas if they didn't work
D) The willingness to prove preconceived ideas
D
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Which of these is true about the relationship between the absorption spectrum and the emission spectrum of a given gas?
a. The emission spectrum has fewer lines than the absorption spectrum. b. The absorption spectrum is multicolored bright lines while the emission spectrum is dark lines. c. All the lines in the emission spectrum correspond to lines in the absorption spectrum. d. All the lines in the absorption spectrum correspond to lines in the emission spectrum. e. Helium was discovered from emission spectra.
The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
Friction: A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35. What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?
A. 60 N B. 120 N C. 170 N D. 230 N E. 490 N
Refer to Figure 6-13 Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks B and C?
A. 20.6 N B. 13.7 N C. 38.3 N D. 25.5 N E. 34.3 N