基于虚拟现实技术的数字试衣间.pptVIP

Quiz 1 Physics Concepts and Connections INSTRUCTOR: TAO LIN SHANDONG UNIVERSITY , WEIHAI Autumn 2011 1. Meters, grams, and seconds are the base units for the SI (MKS) system. A. True B. False 2. How many inches are in one meter? 1 inch = 2.54 cm A. 39.4 B. 141 C. 47.2 D. 91.4 3. A speed (L/T) divided by a force (ML/T2) yields A. T3M B. TL2M-1 C. TL-1M-1 D. TM-1 4. The number 0.0110100 has _____ significant figures. A. three B. four C. five D. six E. eight 5. Scalars differs from vectors in that A. vectors have magnitude but scalars don’t. B. vectors have direction but scalars don’t. C. vectors have units but scalars don’t. D. All of the above 6. The graph shows how the position of a particle depends on time. Which choice is closest to the average speed of the particle in the time interval between 0 and 6 s? A. 0.4 m/s B. 0.67 m/s C. 0.75 m/s D. 1.5 m/s E. 2.22 m/s 7. You are traveling in your car at 51 mph (23 m/s) when an emergency arises. If your car is 4 m long, how many car lengths do you travel during the 0.7s of reaction time (i.e., the time interval between seeing the emergency and hitting the brake with your foot)? A. 2 B. 4 C. 6 D. 8 E. 10 8. If the position of an object is plotted vertically on a graph and the time is plotted horizontally, the instantaneous velocity at a particular time is A. the height of the curve at that time. B. the total length of the curve. C. the slope of the tangent to the curve at that point. D. the area under the curve from zero to that time. E. impossible to determine from this type of plot. 9. On a graph that shows position on the vertical axis and time on the horizontal axis, a parabolic curve that opens upward represents A. a constant positive acceleration. B. a constant negative acceleration. C. no acceleration. D. a positive acceleration followed by a negative acceleration. E. a negative acceleration followed by a positive acceleration. 10. Which graph of v vs t best describes the motion of a particle wit