quizdimensions_ General Physics_ 2023SU-PHYS-004A-101

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6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 1/8 * Some questions not yet graded quizdimensions Due Aug 2 at 11:59pm Points 30 Questions 15 Available Jun 13 at 12am - Aug 2 at 11:59pm Time Limit 50 Minutes Instructions Attempt History Attempt Time Score LATEST Attempt 1 27 minutes 28 out of 30 * Score for this quiz: 28 out of 30 * Submitted Jun 22 at 1:41am This attempt took 27 minutes. 2 attempts 50 mins 1 / 1 pts Question 1 John and Linda are arguing about the definition of density. John says the density of an object is proportional to its mass. Linda says the object's mass is proportional to its density and to its volume. Which one, if either, is correct? They are both wrong. John is correct, but Linda is wrong. John is wrong, but Linda is correct. They are both correct. Correct! Correct! They are free to redefine density as they wish.

6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 2/8 2 / 2 pts Question 2 The term occurs in Bernoulli's equation, with ρ being the density of a fluid and v its speed. The dimensions of this term are what? M L T − 1 5 2 MLT 2 ML T Correct! Correct! − 1 − 2 M L T − 1 9 − 2 M L T − 1 3 − 2 2 / 2 pts Question 3 The standard exam page is 8.50 inches by 11.0 inches. Its area in cm is what? 2 19.5 36.8 93.5 237 603 Correct! Correct!

6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 3/8 2 / 2 pts Question 4 If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two-hour-long movie. 1 400 25 000 50 000 170 000 Correct! Correct! This cannot be determined without knowing how many reels were used. 2 / 2 pts Question 5 Which of the following quantities has the same dimensions as kinetic energy, ? Note: [ a ] = [ g ] = LT ; [ h ] = L and [ v ] = LT . − 2 − 1 ma mvx mvt mgh Correct! Correct! mgt 2 / 2 pts Question 6

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6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 4/8 A rectangle has a length of 1.323 m and a width of 4.16 m. Using significant figure rules, what is the area of this rectangle? 5.503 68 m 2 5.503 7 m 2 5.504 m 2 5.50 m Correct! Correct! 2 5.5 m 2 2 / 2 pts Question 7 Spike claims that dimensional analysis shows that the correct expression for change in velocity, , is , where m is mass, t is time, and F is the magnitude of force. Carla says that can't be true because the dimensions of force are . Which one, if either, is correct? Spike, because . Spike, because . Carla, because . Correct! Correct! Carla, because .

6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 5/8 Spike, because the dimensions of force are . 3 / 3 pts Question 8 One U.S. fluid gallon contains a volume of 231 cubic inches. How many liters of gasoline would you have to buy in Canada to fill a 14-gallon tank? (Note: 1 L = 10 cm .) +3 3 53 Correct! Correct! 21 14 8.0 4.0 2 / 2 pts Question 9 hich of the following products of ratios gives the conversion factors to convert meters per second to miles per hour ? Correct! Correct!

6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 6/8 2 / 2 pts Question 10 The equation for the change of position of a train starting at x = 0 m is given by . The dimensions of b are what? T − 3 LT Correct! Correct! − 3 LT − 2 LT − 1 L T − 1 − 1 2 / 2 pts Question 11 Which one of the quantities below has dimensions equal to ? mv mv 2 Correct! Correct! mrv

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6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 7/8 2 / 2 pts Question 12 At the end of a year, a motor car company announces that sales of a pickup are down 43% for the year. If sales continue to decrease by 43% in each succeeding year, how long will it take for sales to decrease to zero? 1 year 2 years 3 years 4 years More than four years Correct! Correct! 2 / 2 pts Question 13 Which quantity can be converted from the English system to the metric system by the conversion factor ? feet per second feet per hour miles per second miles per hour Correct! Correct! miles per minute

6/22/23, 1:41 AM quizdimensions: General Physics: 2023SU-PHYS-004A-101 https://sjeccd.instructure.com/courses/37200/quizzes/242477 8/8 Not yet graded / 2 pts Question 14 Your Answer: A 2.00 m by 3.00 m plate of aluminum has a mass of 324 kg. What is the thickness of the plate? (The density of aluminum is 2.70 × 10 kg/m .) 3 3 0.02 m 2.00 cm 2 / 2 pts Question 15 The answer to a question is [[MLT ]]. The question is "What are the dimensions of − 1 mr ?" mvr ?" ma ?" mat ?" Correct! Correct! ?" Quiz Score: 28 out of 30

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