A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s. If the vehicles lock bumpers, how fast are they moving just after the collision?
What will be an ideal response?
7.57 m/s
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Why can't current theories describe what happened during the Planck era?
A) We do not know how hot or dense the universe was during that time. B) We do not understand the properties of antimatter. C) We do not yet have a theory that links quantum mechanics and general relativity. D) The Planck era was the time before the Big Bang, and we cannot describe what happened before that instant.
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. How long does it take for the ball to hit the ground?
A) 0.29 s B) 0.57 s C) 1.14 s D) 2.0 s E) 9.8 s
Three essential components of a nuclear reactor are: a fissionable fuel ,a coolant to transfer the heat, and
A) a "scrubber" to prevent radioactive isotopes from getting into the environment. B) a radioactive substance to keep the reaction going. C) tritium to speed up the neutrons. D) control rods. E) lead to stop the neutrons.
Which of the following is true about the ages and masses of spiral and elliptical galaxies?
A) Ellipticals are all older and more massive than spirals. B) Spirals are older, and much more massive than ellipticals. C) Both types are about the same age, but spirals vary less in mass. D) Spirals are younger and much more massive than any elliptical. E) Ellipticals are older, and show a far wider range of masses than do spirals.