A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J
b. 62 J
c. 20 J
d. 44 J
e. 24 J
a
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Which two factors are most important to the existence of plate tectonics on Earth?
A) mantle convection and a thin lithosphere B) oxygen in the atmosphere and mantle convection C) the existence of life and oxygen in the atmosphere D) Earth's liquid outer core and solid inner core
You observe a star very similar to our own Sun in size and mass. This star moves very slightly back and forth in the sky once every 4 months, and you attribute this motion to the effect of an orbiting planet
What can you conclude about the orbiting planet? A) The planet must be closer to the star than Earth is to the Sun. B) The planet must be farther from the star than Neptune is from the Sun. C) The planet must have a mass about the same as the mass of Jupiter. D) You do not have enough information to say anything at all about the planet.
The time interval from one vernal equinox to the next is called one ______________ year
a. sidereal b. celestial c. solar d. tropical
The maximum possible speed in nature is
a. warp 10 b. the speed of light. c. infinite. d. unknown.