erence: Ref4-4 A hook is resting on the surface of a table. Consider the followi
ID: 1778510 • Letter: E
Question
erence: Ref4-4 A hook is resting on the surface of a table. Consider the following four forces that arise in this situation ) the force of the earth pulling on the book (2) the force of the table pushing on the book (3) the force of the book pushing on the table (4) the force of the book pulling on the earth 25. A) Which two forces form an "action-reaction" pair that obeys Newton's third law? I and 2 B) Iand 3 C) I and4 D) 2 and E) 3 and Ans: C 26. The book has an acceleration of equal in magnitude and opposite in direction? A) I and 2 action-reaction" pairs, must be B) 1 and 3 C) l and4 2 and 3 E) 2 and4 D) Ans: A Reference: Ref4-5 A 70.0-kg astronaut pushes to the left on a spacecraft with a force F in "gravity-free" space. The spacecrafit has a total mass of 1o x 10kg. During the push, the astronaut accelerates to the right with an acceleration of o.36 m/s 27. Which one of the following statements concerning this situation is true? A) The spacecraft does not move, but the astronaut moves to the right with a constant speed B) The astronaut stops moving after he stops pushing on the spacecraft. C) The force exerted on the astronaut is larger than the force exerted on the spacecraft. D) The force exerted on the spacecraft is larger than the force exerted on the astronaut E) The velocity of the astronaut increases while he is pushing on the spacecraft. Ans: E 28. Determine the magnitude of the acceleration of the spacecraft. A) 51.4 m/s B) 0.36 m/s C) 2.5 x 10 m/s D) 7.0×103 m/ E) 3.97 x 10 m/s Ans: CExplanation / Answer
28 ) applying newton's 3rd law here
action & reaction are equal and opposite .
force by astronaut = ma = 70*0.36 = 25.2 N
this force equal to force exert on spacecraft
25.2 = 1x10^4*a
a = 2.52 x 10^-3 m/s^2
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