Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
A) 30. km Westward + 40. km Northward
B) 50. km Northwest
C) 40. km Westward + 30. km Northward
D) 30. km Northward + 30. km Westward
E) 40. km Eastward + 30. km Southward
Question 2What is the one piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) the crater from this impact can still be seen in the deserts of Arizona
B) a layer of sediment laid down at that time contains grains of shocked quartz, solidified rock droplets, and soot from global wildfires
C) a layer of sediment laid down at that time is littered with dinosaur fossils
D) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years
Question 3Given 1 angstrom unit = 10-10 m and 1 fermi = 10-15 m , what is the relationship between these units?
A) 1 angstrom = 10+5 fermi
B) 1 angstrom = 10-5 fermi
C) 1 angstrom = 10-25 fermi
D) 1 angstrom = 10+25 fermi
E) none of the given answers
Question 4Imagine we have a planet identical to Jupiter around another star, with the exception that its orbit is much closer. How would its density compare to Jupiter?
A) it would be slightly higher
B) it would be much higher
C) it would be lower
D) it would be the same
Question 5A piece of iron sinks to the bottom of a lake where the pressure is 21 atm. Which statement best describes what happens to the density of that piece of iron?
A) There has been no change in the density of the iron.
B) Its density decreases slightly.
C) Its density increases slightly.
D) Its density becomes 21 times greater.
Question 6A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct?
A) It is impossible to tell since the masses and velocities are not given.
B) The small car experiences the greater average force.
C) The small car and the truck experience the same average force.
D) The truck experiences the greater average force.
Question 7State the principle of conservation of charge.
What will be an ideal response?
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