A gate automatically opens when the water gets too high. How high above the hinge must the water be for the gate to just open?
(A) 0.6 m
(B) 1.2 m
(C) 1.8 m
(D) 2.4 m
(B) 1.2 m
The force of the water on the vertical gate acts at the hinge just as the gate is about to open. If the force moves above the hinge, the gate will open. The distance 0.6 m below the hinge means that the water surface is 2 × 0.6 = 1.2 m above the hinge for
the gate to open.
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The lifetime of a ?+ meson normally is 18 nanoseconds. In a large particle accelerator, scientists can create p+ mesons moving at speeds very close to the speed of light
What do the scientists observe when they measure the lifetime of a ?+ meson that is created at very high speed? A) The ?+ meson lasts 18 nanoseconds. B) The ?+ meson lasts much less than 18 nanoseconds. C) The ?+ meson lasts much more than 18 nanoseconds. D) The ?+ meson no longer decays, and remains as a stable particle.
Which of the sources of error that you cited in question 5 do you think most affected your experiment? Why?
If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length doubled, what will happen to the overall magnification of the microscope?
a. This will result in no change in the magnification. b. The magnification doubles. c. The magnification quadruples. d. The magnification decreases.
A certain automobile tire has a volume of 0.0185 m3. If the absolute (or total) pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire? (R = 8.31 J/mol ? K, NA = 6.022 x 1023 molecules/mol)
A) 3.25 × 1023 molecules B) 3.25 × 1025 molecules C) 3.25 × 1024 molecules D) 2.25 × 1023 molecules E) 2.25 × 1024 molecules