Why can't a worldline on a spacetime diagram be horizontal?
A) A horizontal worldline corresponds to something moving infinitely fast.
B) A horizontal worldline represents traveling backward in time.
C) A horizontal worldline represents moving at exactly the speed of light.
D) A horizontal worldline is possible. It corresponds to a constant, finite speed.
E) A horizontal worldline is possible. It corresponds to a stationary object.
A) A horizontal worldline corresponds to something moving infinitely fast.
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Air within the funnel of a large tornado may have a pressure of only 0.2 atm. What is the approximate outward force on a (5 m × 10 m) wall if a tornado suddenly envelops the house? (1 atm = 1.01 × 105 N/m2.)
A. 4 × 103 N B. 4 × 104 N C. 4 × 105 N D. 4 × 106 N E. 7 × 105 N
Stars at different distances from the galactic center revolve with different periods, an effect called _______________ rotation
Fill in the blank(s) with correct word
An object is placed 25 cm in front of a lens of focal length 20 cm. 60 cm past the first lens is a second lens of focal length 25 cm. How far past the 25-cm lens does the final image form?
a. 20 cm b. 40 cm c. 16 cm d. 25 cm e. 47 cm
Thin Films: Light is incident perpendicularly from air onto a liquid film that is on a glass plate. The liquid film is 199 nm thick, and the liquid has index of refraction 1.60. The glass has index of refraction 1.50. Calculate the longest visible wavelength (as measured in air) of the light for which there will be totally destructive interference between the rays reflected from the top and bottom surfaces of the film. Assume that the visible spectrum lies between 400 nm and 700 nm.
Fill in the blank(s) with the appropriate word(s).