Are there any kinds of situations in which the momentum of a moving system is not conserved?
A) No, because the momentum of any system is always conserved.
B) Yes, if any part of the system is acted upon by forces external to the system.
C) No, because the law of inertia demands that any moving system must keep moving.
D) Yes, if some of the parts of the system collide with each other.
E) Yes, if there is friction acting between different parts of the system.
B
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The lug nuts on a car wheel require tightening to a torque of 90 N ? m. If a 30-cm long wrench is used, what is the magnitude of the minimum force required using the wrench?
A) 30 N B) 15 N C) 300 N D) 150 N
A ball is rolled horizontally off a table with an initial speed of 0.18 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. What is the height of the table? Note: g = 9.8 m/s2 and air resistance is negligible
a. 0.11 m c. 0.33 m b. 0.22 m d. 0.44 m
Thin Lenses: Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A. The image is always real. B. The image is always virtual. C. The image is always inverted. D. The image is always upright. E. None of these choices are correct.
What is not true about the interstellar gas?
A: it's what all stars and planets are made of B: it has very few atoms in each small volume C: it's primarily Helium D: it's an important component in a whole galaxy E: it contains information about the evolution of a galaxy