o SCr 1000-Scientific Inquiry Newtonian Mechanics Semester: Fall Semester 2017 S

Question

o SCr 1000-Scientific Inquiry Newtonian Mechanics Semester: Fall Semester 2017 Scientific Inquiry-Institlle Instructor: Dr. David Z. Jacome Due: Wednesday, October 18th 2017 11:59PM via Blackboard 16. An x vs. f graph is drawn for a ball moving in one direction. The graph starts at the origin and r 5 s the velocity of the ball is zero. We can be positive that atr5 s, A. The slope of the curve is non-zero B. The ball has stopped C. The acceleration is constant D. The curve is at x-0,t-0 E. The slope of the curve is zero 17. A v vs. t graph is drawn for a ball moving in one direction. The graph starts at the origin and a t r 5 s, the acceleration of the ball is zero. We know that at t = 5 s, A. The slope of the curve is non-zero B. The velocity of the ball is not changing C. The curve is not crossing the time axis D. The curve is at v- 0,t-0 E. The velocity of the ball is zero 18. The value of an object's acceleration may be characterized in equivalent words by which of the following? Displacement B. A. Rate of change of displacement C. Velocity D. Rate of change of velocity E. The change of velocity 19. When we subtract a velocity vector from another velocity vector, the result is: A., Another velocity An acceleration C. A displacement D. A scalar E. None of the above 20. Which of the following expresses a principle, w incorporated into Newton's laws of motion? A. An object's acceleration is inversely proportional to its mass B. For every action there is an equal but opposite reaction C. The natural condition for a moving object is to remain in motion D. The natural condition for a moving object is to come to rest E. Forces in nature always exist in pairs ART II: 10 Open Ended Problems (6 pts each, 60 pts. Total) 21. Write these values as full decimal number (not using scientifie notation), in standard SI base units, without any prefixes, preserving the number of significant figures. (a) m= 16.0 mg

Explanation / Answer

16] For an x vs t graph, the velocity will be the slope of the graph since slope = x/t = v

so, it is given that at t = 5s, the velocity = 0 m/s

therefore, the ball has momentarily stopped and that the slope of the graph at that point is zero.

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