A cart has an initial velocity of 5.0 m/s to the right and a constant acceleration of 2.0 m/s2 to the right. What is the cart's displacement during the first 6.0 s of this motion?
A) 10 m
B) 55 m
C) 66 m
D) 80 m
C
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The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm?
a. 7.7° b. 16.6° c. 6.6° d. 3.2° e. 19.2°
Helium condenses into the liquid phase at approximately 4 K. What temperature, in degrees Fahrenheit, does this correspond to?
a. ?182 b. ?269 c. ?118 d. ?452 e. ?484
Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos. B) The photosphere emits visible light. C) The photosphere is made out of mainly hydrogen and helium. D) The corona is hotter than the photosphere. E) The Sun's core is gradually turning hydrogen into helium.
Which characteristic of Earth explains why we have an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life B) the existence of plate tectonics C) the moderate surface temperature D) the existence of oceans