The moon revolves around the earth once every __________ days
Fill in the blank(s) with the appropriate word(s).
Ans: 27.3
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Equilibrium: A piano mover raises a 1000-N piano at a constant speed using a very light rope in a frictionless pulley system, as shown in the figure. With what force is the mover pulling down on the rope?
A. 2000 N B. 1000 N C. 500 N D. 250 N E. Depends on the speed of the piano.
Diffraction Gratings: What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a diffracting grating having 587 lines per millimeter?
A. 34.8° B. 24.8° C. 41.3° D. 29.4° E. 4.21°
The index of refraction, n, of a material is a measure of how the speed of light changes. What can be said about the speed of light in a material with n=1.5 compared to a material with n=1.7?
A. It is the same for both. B. It is slower in the n=1.7 material. C. It is slower in the n=1.5 material. D. It depends on the wavelength of the light.
Discuss the role that gravity assist played in Voyager 2 and its Grand Tour
What will be an ideal response?