Question

Name Physics 1401 Teat 19 -2) Fall 2018 mple Choice (4pts each) 8.3057 cm is added to 0.50 cm. The 'sesroprately manded 1.Aingth of A 90 om В 89cm C. 890 om D. 8896 om 2. A 0.060mm messurement is by 3.9902 mm. The "eppropriately rounded produ B. 023 mm C. 0.232 D. 0.2316 mm 3. 7.329x10 centimeters equais A. 7.329 x 1011 km B. 7.329 x 101 km C. 7.329 x 102 km D. 7.329x 10 km 4. Two different coins are placed on the cover of a book, and the cover is slowly opened. Assuming the coefficients of static friction are the same, which is true? A. The more massive coin starts to slide first B. The less massive coin starts to slide first C. The two coins start to slide at the same time. D. None of the above 5. 75 mies per hour, meters per second (1 mile . 1.000 km and 1 hour . 3600 seconds) A. 0.44 m/s B. 13 m/s C. 21 m/s D. 34 mis #6. C B A, B, C, D, E, and F are vectors in the drawing to the left 6. Vector A is equal to A E+F B C+F C C+E D B+F 7. Which of these is not a long-range force? A、 B. C. D. the force that keeps the Earth in its orbital path around the Sun the force that a person exerts on a chair while sitting the force that makes a compass point to the north the force that makes raindrops fall to the ground

Answer 1

1.

8.3957 + 0.50

8.8957

since the numbers being added has lowest significant figure of 2. hence the answer must be rounded to 2 significant figure.

so 8.9

3)

7.329 x 10^-6 cm

(7.329 x 10^-6 cm) (1 m/100 cm) (1 km/1000 m)

(7.329 x 10^-6) (1/(100 x 1000))

7.329 x 10^-11 km

5.

76 miles per hour

76 miles/hour (1609.34 m/1 mile) (1 hour/3600 sec)

(76) (1609.34/3600) m/s

34 m/s