All pulsars are neutron stars, but not all neutron stars are pulsars
Indicate whether the statement is true or false
TRUE
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Newton's law of gravitational force states that ____
a. an object with no force on acting on it continues at rest or moves in uniform motion in a straight line with constant velocity b. an object with no force on it moves in a straight line with constant acceleration c. for every action, there is an equal and opposite reaction d. the force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared e. an object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force
The first successful landers on the surface of Mars were:
A) Mariners 4 and 5 in 1965. B) Vikings 1 and 2 in 1976. C) Voyagers 1 and 2 in 1979. D) Pathfinder and Sojourner in 1997. E) Spirit and Opportunity in 2004.
The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy b. the fraction of stars with planets c. the number of planets per star in habitable zone longer than a few billion years d. the fraction of suitable planet where technical life forms evolve. e. All of the above.
Simple Harmonic Motion: If the frequency of a system undergoing simple harmonic motion doubles, by what factor does the maximum value of acceleration change?
A. 4
B. 2
C. 
D. 2/?