A constant force is acting on an object. Which of these graphs best represents the acceleration of the object?
A. 
B. 
C. 
A. 
Recall that a = F/m. If F is constant then a is constant.
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Kiloparsec is a unit of sound
Indicate whether the statement is true or false
In the evolution of massive stars, what is the significance of the temperature 600 million K?
A) It is the temperature at which helium fuses into carbon. B) It is the temperature needed for carbon fusing into heavier elements. C) It is the main sequence core temperature which makes massive stars so bright. D) It is the temperature needed for helium burning into boron. E) It is the final temperature reached during their evolution.
Which one of the following is a correct statement for a number of resistors connected in series or parallel?
A) The total resistance in a series circuit decreases as more resistors are added. B) The flow of current is different through resistors connected in a series circuit. C) The voltage is different across resistors connected in a parallel circuit. D) The total resistance in a parallel circuit decreases as more resistors are added. E) None of the above statements is correct.
Which classes of stars with large habitable zones probably don't last long enough for life to evolve to use them?
What will be an ideal response?