Why is it so difficult to remove the lid from a vacuum-sealed jar?
A) The air pressure outside the jar pushes downward on the lid more strongly than the air pressure inside pushes upward on the lid.
B) The higher pressure inside the jar pulls inward on the lid, holding it firmly to the jar.
C) The vacuum inside the jar pulls inward on the lid, holding it firmly to the jar.
D) The vacuum inside the jar pushes outward on the lid, holding it firmly to the jar.
E) The air pressure inside the jar pushes upward on the lid more strongly than the air pressure outside pushes downward on the lid.
A
You might also like to view...
If y = 0.02 sin (30x - 400t) (SI units), the frequency of the wave is
a. 30 Hz b. 15/p Hz c. 200/p Hz d. 400 Hz e. 800p Hz
Individual pixels are visible in a zoomed bitmap image.
Answer the following statement true (T) or false (F)
Most of the mass of our Galaxy lies
A) at the galactic center. B) outside the luminous part of the Milky Way Galaxy. C) between Earth and the Galactic center. D) within the bulge. E) in the bright spiral arms.
Suppose that Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees. Which of the following would be true, and why?
A) The seasons would be more extreme, because the Sun's rays would be more direct in summer and less direct in winter. B) The seasons would be more extreme, because the Earth's surface would be closer to the Sun in the summer and farther from the Sun in the winter. C) The seasons would be less extreme, because the Sun's rays would be less direct in summer and more direct in winter. D) The seasons would be less extreme, because the Earths' surface would be farther from the Sun in the summer and closer to the Sun in the winter.