A car starting from rest accelerates at a constant 2.0 m/s2 for 10 s. It then travels with constant speed it has achieved for another 10 s. Then it finally slows to a stop with constant acceleration of magnitude 2.0 m/s2
How far does it travel after starting?
A) 200 m B) 400 m C) 500 m D) 300 m
B
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Which of the following stars has the hottest surface temperature?
A) the blue star B) the orange star C) the yellow star D) the red star
A fixed container holds oxygen and helium gases at the same temperature. Which of the following statements are correct? (There could be more than one correct choice.)
A) The oxygen molecules have the greater speed. B) The helium molecules have the same average kinetic as the oxygen molecules. C) The helium molecules have the greater speed. D) The helium molecules have the greater average kinetic energy. E) The oxygen molecules have the greater average kinetic energy.
?Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If vector 
is added to vector 
, the result is a third vector that is perpendicular to and has a magnitude equal to 3. What is the ratio of the magnitude of to that of ?
A. 1.8
B. 2.2
C. 3.2
D. 1.3
E. 1.6
The fastest moving planet in a solar system is the
A) smallest planet. B) most massive planet. C) planet nearest the Sun. D) planet farthest from the Sun. E) all move at the same speed.