You are going to construct a new optical observatory, and money is no object. Other than putting it into space, what factors will affect your decision for its location on Earth?
What will be an ideal response?
Closer to the equator will give you a view of more of the entire celestial sphere. The higher your location, the less turbulence you will experience, and less water to block the infrared. You want a large number of clear nights, very stable atmospheric conditions, and isolation from man-made light pollution. Such sites are often located on mountain tops in deserts, isolated coastal mountains in the Americas, and on mountaintops on islands like Hawaii and the Canary Islands.
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Discuss why the new theory, called quantum mechanics, was so successful
What will be an ideal response?
For visible light, which property of visible electromagnetic waves changes with color?
A. Frequency and wavelength B. Amplitude and frequency C. Frequency D. Wavelength E. Amplitude
A uniform, horizontal beam of length 8.0 m and weight 42.4 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60.0° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?
a. 24.5 N b. 49.0 N c. 294 N d. 4.59 N e. 171 N
A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?
A) 9.8 m/s B) 25 m/s C) 49 m/s D) 98 m/s