Item 20 V Part A Estimate how many hours it would take to run (at 10 km/h) non-stop across the U.S. from New York to California. Suppose that the distance is about 3000 mi. O 500 hr O 40,000 hr O 4,000 hr 50 hr Submit Request AnswerItem 19 7 Part A The age of the universe is thought to be about 14 billion ears. y Assuming two significant figures, write this in powers of ten in years, Express yOur answer using two significant figures. m Quest Answer v PartB Assuming two significant figures, write this in powers of ten in seconds. Express your answer using two significant figures. .AZCbMC)? S m Muest Answer ltem18 I Review | Constants V Part A Estimate how many books can be shelved in a college library with 3500 In2 of floor space. Assume 8 shelves high, having books on both sides, with corridors 1.5 m wide. Assume books are approximately 25 cm deep and 5 cm wide, on average. 0 Approximate number of books in the libraw is 7 X 107. 0 Approximate number of books in the \"brew is 6 X 105. 0 Approximate number of books in the \"brew is 6 X 103. 0 Approximate number of books in the \"brew is 7 X 109. Item 17 V PartA Express the following sum with the correct number of significant figures: 1.40111 + 166.3cm + 5.32 X 105 pm. Item 16 V PartA Time intervals measured with a stopwatch typically have an uncertainty of about 0.2 3, due to human reaction time at the start and stop moments. What is the percent uncertainty of a handtimed measurement of 2 s ? Express your answer using one significant figure. m Muest Answer V PartB What is the percent uncertainty of a handtimed measurement of 70 s ? Express yOur answer using one significant figure. M Quest Answer Part C What is the percent uncertainty of a handtimed measurement of 8 min ? Express your answer using one significant figure. VO AEQ % Submit Request AnswerItem "ID I Review | Constants V PartA In physics, every physical quantity is measured with respect to a unit. Time is measured in seconds, length is measured in meters, and mass is measured in kilograms. Knowing the units of physical quantities will help you solve problems in physics. Gravity causes objects to be attracted to one another. This attraction keeps our feet firmly planted on the ground and causes the moon to orbit the earth. The force of gravitational attraction is represented by the equation Gmnz F = 2 'I' where F is the magnitude of the gravitational attraction on either body, m1 and 7722 are the masses of the bodies, 7' is the distance between them, and G is the gravitational constant. In SI units, the units of force are kg - m/s2, the units of mass are kg, and the units of distance are m. For this equation to have consistent units, the units of G must be which of the following? D View Available Hint(s) 0 kg m-s2 ,2 O kgs Part B One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E = mc, where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following? View Available Hint(s) O kg.m S O kg.m2 O kg.s2 m2 O kg.m2 S SubmitItem 14 Part A Choose the correct representation of number 1.156 in "powers of 10" notation. O 1.156 X 101 O 1.156 x 100 O 11.56 X 101 O 1156 X 10-2 Submit Request Answer V Part B Choose the correct representation of number 21.8 in "powers of 10" notation. O 218 X 10-3 O 2.18 x 101 O 2.18 x 102 O 218 x 10-2 Submit Request AnswerPart C Choose the correct representation of number 0.0068 in "powers of 10" notation. O 68 x 10-3 6.8 x 10-4 O 6.8 x 10-3 O 68 x 10-2 Submit Request Answer Part D Choose the correct representation of number 328.65 in "powers of 10" notation. 3.2865 X 103 3.2865 X 102 32.865 X 10-1 32865 X 10-3 Submit Request AnswerPart E Choose the correct representation of number 0.219 in "powers of 10" notation. O 2.19 X 10-1 O 21.9 X 102 O 2.19 X 101 O 219 X 10-2 Submit Request Answer V Part F Choose the correct representation of number 444 in "powers of 10" notation. O 4.44 X 101 O 0.444 X 101 O 44.4 X 102 O 4.44 X 102 Submit Request AnswerItem 13 Part A What are the dimensions of density, which is mass per volume? The dimensions of mass and length are abbreviated as [M] and [ L] respectively. O [~] O [ML3] O [ML] o [M ] Submit Request AnswerItem 12 Part A Write out the number 8.29 x 104 in full with the correct number of zeros. 8.29 x 104 = Submit Request Answer Part B Write out 9.3 x 103 in full with the correct number of zeros. 9.3 X 103 = Submit Request Answer Part C Write out the number 8.8 x 1071 in full with the correct number of zeros. 8.8 x 107= Submit Request AnswerPart D Write out the number 4.86 x 102 in full with the correct number of zeros. 4.86 X 102 = Submit Request Answer V Part E Write out the number 3.52 x 1075 in full with the correct number of zeros. 3.52 x 10 = Submit Request AnswerItem 11 Part A A typical atom has a diameter of about 1.0 x 10-10 m. What is this in inches? Express your answer using two significant figures. OA AEQ ? in Submit Request Answer Part B Approximately how many atoms are there along a 9.0 -cm line? Express your answer using two significant figures. AEQ ? atoms Submit Request AnswerItem 10 V Part A What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 2.66 + 0.09 m? Express your answer using one significant figure. VO AEd AV % Vspecified Submit Request AnswerItem 9 Part A A number written in scientific notation has the form a x 10", where 1 View Available Hint(s) V PartB Approximately what is the mass of the average adult in kilograms? D View Available Hint(s) O 80 kg 0 500 kg 0 1200 kg Item 5 V Part A Estimate the number of liters of water a human drinks in a lifetime. Suppose that a human drinks 2 L of water per day, and the approximate lifetime is 70 years. 0 A human drinks in a lifetime appoximately 5 X 104 L. O A human drinks in a lifetime appoximately 7 X 106 L. O A human drinks in a lifetime appoximately 5 X 108 L. O A human drinks in a lifetime appoximately 700 L. l.-. Item 4 Unit conversion problems can seem tedious and unnecessary at times. However, different systems of units are used in different parts of the world, so when dealing with international transactions, documents, software, etc., unit conversions are often necessary.