The amount of potential energy possessed by an elevated object is
A) relative to a chosen reference level.
B) equal to the work done in lifting it.
C) equal to the kinetic energy it will acquire when freely falling to its reference level.
D) all of the above
Answer: D
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If, in a parallel universe, ? has the value 3.14149, express ? in that universe to four significant figures
A) 3.141 B) 3.142 C) 3.1415 D) 3.1414
Two spaceships traveling in opposite directions along parallel lines measure their own and the other spaceship's length while passing one another. The crew on spaceship A says that their ship is 1000 m long and that ship B is 800 m long. The crew on ship B says that their ship is 1000 m long and that ship A is 800 m long. At what speed does each crew say that the other ship is traveling relative
to their own ship? a. 0.36c b. 0.60c c. 0.64c d. 0.80c e. 1.25c
What is the force per meter on a straight wire carrying 5.0 A when it is placed in a magnetic field of 0.020 T? (The wire makes an angle of 27° with respect to the magnetic field lines.)
A) 0.26 N/m B) 0.045 N/m C) 0.022 N/m D) 0.17 N/m E) 0.071 N/m
The characteristic that distinguishes schist from slate is that schist is
A) foliated and slate is not. B) fine-grained and slate is coarse-grained. C) coarse-grained and slate is fine-grained. D) not foliated and slate is foliated.