The concept of force is fundamental to
A) Newton's theory of gravitation.
B) Einstein's theory of gravitation.
C) both of these
D) neither of these
Answer: A
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According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?
A) irregular galaxies B) elliptical galaxies C) spiral galaxies D) We can't say because humans were not alive at that time.
The primary reason for the high specific heat of polymers is their low monomer _____________.
Fill in the blank(s) with the appropriate word(s).
A "double satellite" is launched into space. It consists of a satellite of mass m and another satellite of mass 5m. The connecting mechanism of these satellites is an explosive bolt and a compressed spring, both of negligible mass. The bolt is exploded and the satellites drift apart having been pushed by the spring. When the less massive satellite has moved a distance of 2.5 m from the center of
mass of the double satellite, how far away from it is the satellite of greater mass? a. 3.0 m b. 2.0 m c. 0.50 m d. 4.5 m
In the lab, charged particles are directed toward one another, each at speed 0.500 c. What is the speed of the particles moving toward the left with respect to the particles moving to the right?
A. 0.500 c B. 0.00 C. 1.00 c D. 0.800 c E. 1.25 c