The oldest known fossils of single-celled organisms are
A) 4.6 billion years old.
B) 3.9 billion years old.
C) 3.3-3.5 billion years old.
D) 1.3-1.5 billion years old.
Answer: D
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A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It travels a distance d before coming to rest. If its initial velocity were doubled, the distance required to stop would
A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four.
The Coulomb force between two charges can be attractive or repulsive
Indicate whether the statement is true or false
Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?
A) 20 min B) 22 min C) 24 min D) 30 min
Determine which of the following objects obey the equations of projectile motion developed in this chapter
i. A ball is thrown in an arbitrary direction. ii. A jet airplane crosses the sky with its engines thrusting the plane forward. iii. A rocket leaves the launch pad. iv. A rocket moving through the sky after its engines have failed. v. A stone is thrown underwater.
1.(i) and (v) only 2.(ii), (iii) and (iv) only 3.(i) and (iv) only 4.All of them obey the equations of projectile motion.