How are galaxies important to our existence?
A) Without galaxies, there could not have been a Big Bang.
B) Without galaxies, the universe could not be expanding.
C) Deep in their centers, galaxies created the elements from which we are made.
D) Galaxies recycle material from one generation of stars to the next, and without this recycling, we could not exist.
D) Galaxies recycle material from one generation of stars to the next, and without this recycling, we could not exist.
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Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A. 200 N B. 390 N C. 790 N D. 490 N E. 590 N
In 1632, which book did the Inquisition order sales to be stopped?
a. De Revolutionibus b. Stederreus Nunctus c. Dialogo d. De Stella Nova e. Astronomia Nova
A 29.0-pm-wavelength photon is scattered by a stationary electron
What is the maximum energy loss the photon can have? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 15 keV B) 4.0 keV C) 6.1 keV D) 10 keV E) 12 keV
A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.75 s. How high is the cliff?
What will be an ideal response?