If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise) with the time axis, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D) moving with increasing acceleration.
B
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Blue stars are always more luminous than red stars
Indicate whether the statement is true or false
In the "Coral Model" of galactic colonization, if we assume that colonizing ships can travel at a few percent of the speed of light, then we might expect all of the habitable planets in the galaxy to be colonized within a few
A) tens of billions of years B) billion of years C) hundred thousand years D) tens of millions of years
The Big Bang occurred
a. about 15 to 20 billion years ago. b. about 5 to 7 thousand years ago. c. about 4 to 6 billion years ago. d. infinitely far in the past.
A scientist is investigating the results of varying temperature on the growth rate of a bacterial culture. In this experiment, temperature is the:
a. dependent variable b. independent variable c. control d. model e. hypothesis