The first detailed astronomical observations were made by the
A) Mayans
B) Egyptians
C) Chinese
D) Babylonians
C
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Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 ?m in diameter
Treating dust as an ideal gas, what is the root-mean-square speed (thermal speed) of a dust particle at (The Boltzmann constant is 1.38 × 10-23 J/K.) A) 5.2 × 10-5 m/s B) 1.7 × 10-5 m/s C) 3.0 × 10-5 m/s D) 7.3 × 10-5 m/s
A convex lens has a focal length f. An object is placed at a distance between f and 2f on a line perpendicular to the center of the lens. The image formed is located at what distance from the lens?
A) 2f B) between f and 2f C) f D) between the lens and f E) farther than 2f
An equation that describes the displacement in Simple Harmonic Motion is: x(t) = 1.20 m sin(2.40 rad/s t). What is the maximum velocity of the SHM?
A. 5.32 m/s B. 4.82 m/s C. 3.68 m/s D. 2.88 m/s E. 2.03 m/s
If the image distance is negative, the image formed by a mirror is a(n)
A) real image. B) virtual image. C) imaginary image. D) positive image. E) negative image.