A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2. At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time.
What will be an ideal response?
14.1 m/s, 28.3 s
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T Tauri stars are post-main-sequence stars
Indicate whether the statement is true or false
Lens-Maker Formula: An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of magnitudes 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens when used in the night air?
A. 43 cm B. 130 cm C. 89 cm D. 44 cm E. 220 cm
What evidence leads astronomers to conclude that the universe contains a mysterious dark energy?
A) The expansion of the universe is accelerating with time. B) The gravity of distant galaxies is stronger than that of galaxies nearby. C) Studies of galactic motion indicate that there is more matter in the universe than we can account for with stars and gas. D) Stars shine much more brightly than we would expect from nuclear fusion. E) The existence of such dark energy is the only way to account for evil in the universe.
Secondary seismic waves travel ______________ (slower or faster?) than primary waves in solids
Fill in the blank(s) with correct word