Exam: Physics Questions & Answers

Exam: Physics Questions & Answers (0,0) - CORRECT ANSWER- The graph above describes the motion of a ball. At what point does the ball have an instantaneous velocity of zero? 0.0 m/s - CORRECT ANSWER- What is the speed of an object at rest? 0.0-5.0s - CORRECT ANSWER- According to the graph above, during which interval does the cat have the greatest positive velocity? 1 second - CORRECT ANSWER- The SI base unit for time is: 1/2Vcar - CORRECT ANSWER- A car travels down a road at a certain velocity, Vcar. The drier slows down so that the car is traveling only half as fast as before. Which of the following is the correct expression for the resulting velocity? 10.0-15.0s - CORRECT ANSWER- According to the graph above, the cat has the fastest speed during which interval? 10^2 m - CORRECT ANSWER- Estimate the order of magnitude of the length of a football field. 10^57 - CORRECT ANSWER- The sun is composed mostly of hydrogen. The mass of the sun is 2.0x10^30 kg, and the mass of a hydrogen atom is 1.67x10^-27 kg. Estimate the number of atoms in the sun. 2.9x10^2 - CORRECT ANSWER- Calculate the following, and express the answer in scientific notation with the correct number of significant figures: 10.5*8.8*3.14 29cm - CORRECT ANSWER- An ant on a picnic table travels 3.0x10^1 cm eastward, then 25cm northward, and finally 15cm westward. What is the magnitude of the ant's displacement relative to its original position?