Question

Phys2425 PRE-LAB FORM MEASUREMENTS 1. Write the answers for the following in a. The earth's circumference, measured through the poles, is exactly 40,000 020 m (according to an early standard of the meter). What is the Tadius of the earth, R? b. The surface area of the earth is given by A Tm 4x xR. What is the arca A? c. Using the units conversion I inch-2.54 cm, convert the volume V -302 in' into a volume in cubic cm (em) and in liters. (1 L-1000 cm). Show your steps in below! cm2- 2. Consider the illustration of a standard metric scale across the two lines. 21 345 0 a. Write a short definition of least count, and state what the least count is for this raler b. Show how to determine x, the distance between the two lines. Record data in mm. (See the illustration inside the manual.) Result:x 17

Answer 1

we have giren (a) Cirumference = 40,000, 000 m Radins = ?. C= 2HR 40x106 = 21R Rdims (R) = 4ox)0 6.366X106 m Sustace Area (A) = 4TTR? 2. ht x (40x0)- A = 4it(40xlo6 (4oxlo)2 = 51xJ0"m2 we have girm 1 INCH= 2.sucm C) V= 302 Inch3 1 inch: 2:54cm 1Dnch 3: 2:54 cmx 2:54Bmx 2:54cm 16.387 cm3 1ameh' = Volne (V) = 302 inch3 (302x 16-387) Cm3 * 4.95 X103 cm3 (9) least Comt : It is the Smallest valne that can be measmd Instrument. by Measuning for ginen pickuse ; least Cont of Ruler : Imm r ol cm 6:3 b) X(AB): 6:3 cm- 2cm 43 cm Icm = lomm AB(x) = 4.3x10 43mm 2.

3) you have to measure the dimensions of the page, along with the uncertainty (least count) then calculate the Area of the sheet. (as there is no data, I am helpless)

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