Buoyancy: An object has a volume of 4.0 m3 and weighs 40,000 N. What will its apparent weight be in water of density 1000 kg/m3?
A. 40,000 N
B. 39,200 N
C. 9800 N
D. 800 N
Answer: D
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Springs: An ideal spring has a spring constant (force constant) of 2500 N/m. is stretched 4.0 cm. How much work is required to stretch the spring by 4.0 cm?
A. 4.0 J B. 0.00 J C. 1.0 J D. 3.0 J E. 2.0 J
A film of thickness 106 nm soap bubble film (n = 1.42 ) results in a constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 601 nm
What are the next three thicknesses of this film that will also result in a constructive interference? A) 212 nm, 318 nm, 424 nm B) 53.0 nm, 35.3 nm, 26.5 nm C) 212 nm, 424 nm, 636 nm D) 67.0 nm, 42.4 nm, 22.3 nm E) 317 nm, 529 nm, 741 nm
How is the atmosphere of a planet affected by the rotation rate?
A) Faster rotation rates raise the atmospheric temperature. B) The rotation rate determines how long the planet is able to retain its atmosphere. C) The rotation rate determines how much atmosphere a planet has. D) Faster rotation rates produce stronger winds. E) Faster rotation rates raise surface temperatures and thus determine how much material is gaseous versus icy or liquid.
The relaxation time for tensile stress relaxation is equal to the elastic modulus divided by three times the _________.
Fill in the blank(s) with the appropriate word(s).