Name three properties of the solar nebula still seen in planet orbits
What will be an ideal response?
The planets still orbit in the common counter clockwise direction. This was the direction of the condensing nebula's rotation. The orbits are almost circular, as the nebula formed in concentric rings. All planets move close to the ecliptic, the plane in which the condensing disk flattened out around the Sun's equator.
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Center of Mass: Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass (or center of gravity) of this system?
A. (1.3 m, 0.67 m) B. (1.3 m, -0.67 m) C. (-1.3 m, 0.67 m) D. (-1.3 m, -0.67 m)
Suppose the energy of the longest-wavelength photon emitted by an electron in a box of length L is Eph. What is the energy of the photon with the fourth-longest wavelength that might be emitted?
A. (4/3)Eph B. (5/3)Eph C. (7/3)Eph D. (8/3)Eph E. 3Eph
A very dense 1500-kg point mass (
A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2 )
A mass of 100 g is attached to one end of a massless rod, 10 cm in length, which is pivoted about the opposite end. The rod is held vertical, with the mass at the top, and released. The rod swings
What is the speed of the mass at the instant that the rod is horizontal? A) 0.71 m/s B) 4.0 m/s C) 2.0 m/s D) 1.4 m/s E) 2.8 m/s