A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is 1,200 W
Indicate whether the statement is true or false
T
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Compound Microscope: You have a choice between two lenses of focal lengths fa and fb, where fb = 2fa, to use as the objective lens in building a compound microscope. If the magnification you obtain using lens a is Ma, what will be the magnification when using lens b?
A. Mb = 2 Ma B. Mb = 4 Ma C. Mb = 8 Ma D. Mb = Ma/4 E. Mb = Ma/2
Describe how gravitational lensing works. What can it tell us about the galaxy that is doing the lensing? How is lensing valuable to the study of dark matter?
What will be an ideal response?
In the context of the double-slit experiment, quantum uncertainty refers to
A) the fact that the particles of matter or radiation are instantaneously replaced by a spread-out matter field or EM field when the particles impact the screen. B) the fact that the electron beam or light beam goes through both slits rather than only one. C) our inability to precisely predict the point at which a spread-out matter field or EM field will interact with the screen. D) the fact that the entire matter field or EM field instantaneously collapses to the single interaction point when the field interacts with the screen. E) the fact that each interaction with the screen occurs over a broad area of the screen.
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
a. 7.0 N b. 2.0 N c. 3.1 N d. 5.1 N e. 6.6 N