Which of the following materials is most likely to act as an oxidizing agent?
A) Na
B) Na+
C) Cl2
D) Cl-
E) both A and B
Answer: C
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For most of history, the lack of observable stellar parallax was interpreted to mean that ________
A) stars must all lie at the same distance from Earth, on the celestial sphere B) Galileo's theories of the universe were essentially correct C) stars were too far away for parallax to be measured with available technology D) Earth is stationary at the center of the universe
A child pulls on a wagon with a force of 75N If the wagon moves a total of 42m in 3.1min what is the average power delivered by the child?
A) 21 W B) 22 W C) 26 W D) 17 W
Diffraction Gratings: In a diffraction grating experiment, light of 600 nm wavelength produces a first-order maximum 0.35 mm from the central maximum on a distant screen. On the same screen, a second monochromatic source produces a third-order maximum 0.87 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
Fill in the blank(s) with the appropriate word(s).
Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A) Their electric potential energy keeps increasing. B) Their kinetic energy keeps increasing. C) Their kinetic energy keeps decreasing. D) Their electric potential energy keeps decreasing. E) Their acceleration keeps decreasing.