Question

(part of preparation This homework includes exercises on the topics discussed in the white pages of Module 1. Ans: 1. Which of the following is not an SI base unit? (B) kilogram (C) second (E) All the above are SI units (D) Kelvin (A) meter 2. The diameter of the Earth at the equator is 7866.381 mi. mi (a) Round off this quantity to four significant figures (b) Round off this quantity to two significant figures mi 3. Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water E) 11.4 g/mL when placed in a graduated cylinder. A) 8.08 g/mL D) 18.1 g/mL C) 12.4 g/mL B) 1.38 g/mL Answer(s): 4. Carry out the following conversions. Half credit for correct answer and half credit for showing work! (a) 158 cm to in. Hint: See white pages for conversion factor. Answer(s): (b) 5.14 kg =. Hint: See white pages for conversion factor. g. Answer(s): Solve for x: Circle the answer, Show all work! a) 5x = 9 12 16 b) (6 * 14) (7x) 12 %3D 8.

Answer 1

1)NOT a SI unit

a)meter - Meter is SI unit of distance

b)kilogram is SI unit of mass

c)second is SI unit of time

d)kelvin is SI unit of temperature

e)all are SI unit, it is the correct option as all are SI units

2) 7866.381 mil has 7 significant figures

a) round off upto four significant figure - counting from left we will consider 4 significant figure,we will check 5th significant figure,if that significant figure is 5 or more than 5, then add 1 in the 4th significant figure

since here the 5th significant is less than 5,that is 3,nothing will be added

answer is 7866 mil

b) round off upto 2 significant figure

  counting from left we will consider 2 significant figure,we will check 3rd significant figure,if that significant figure is 5 or more than 5, then add 1 in the 2nd significant figure.

since here third significant figure is 6,so one will be added

answer is 7900 miles

3)Given,

mass of object = 149.8 g

volume displaced by object = 12.1 ml

density = mass/volume = 149.8/12.1 = 12.4 g/ml

so third option is correct.

4) Conversion

a) 158 cm to inch

1 cm = 0.3937 inch

therefore , 158 cm = 158 x 0.3937 = 62.20 inch

b) 5.14 kg into gram

1 kg = 1000 gram

therefore 5.14 kg = 5.14 x 1000 = 5140 g

5)

a) 5x/12 = 9/16

= 5x = (12x9)/16

= x = 27/(4x5)

=x = 27/20 =1.35

b)(6*14)/7x = 12/8

= 12/x =12/8

= x = (12*8)/12

=x = 8