A car traveling at a velocity v can stop in a minimum distance d. What would be the car's minimum stopping distance if it were traveling at a velocity of 2v?
(a) d.
(b) square root of 2d
(c) 2d.
(d) 4d.
(e) 8d.
Answer: (d) 4d.
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Which statement about accretion disks is not true?
A) The primary factor determining whether a white dwarf has an accretion disk is the white dwarf's mass. B) The gas in the inner parts of the disk travels faster than the gas in the outer parts of the disk. C) The gas in the inner parts of the disk is hotter than the gas in the outer parts of the disk. D) Accretion disks are made primarily of hydrogen and helium gas.
The concept of pressure involves both
A) force and volume. B) force and area. C) area and volume.
The mass of Neptune can be calculated from measurements of
A) Neptune's orbital period and its distance from the Sun. B) the Sun's mass and how Neptune's speed changes during its elliptical orbit around the Sun. C) the masses of Neptune's moons, Triton and Nereid. D) the gravitational influence of Jupiter and Saturn on Neptune's orbit around the Sun. E) the orbital period and distance of the moon Triton from Neptune.
Exhibit 4-1While her kid brother is on a wooden horse at the edge of a merry-go-round, Sheila rides her bicycle parallel to its edge. The wooden horses have a tangential speed of 6 m/s. Sheila rides at 4 m/s. The radius of the merry-go-round is 8 m.Use this exhibit to answer the following question(s). Refer to Exhibit 4-1. At what time intervals does Sheila encounter her brother, if she rides opposite to the direction of rotation of the merry-go-round?
A. 5.03 s B. 8.37 s C. 12.6 s D. 25.1 s E. 50.2 s