QUESTION IMAGE
Question
multiple choice
identify the choice that best completes the statement or answers the question.
- chris measures the brightness of a flashlight bulb as he adds more batteries to the circuit. if he prepares a graph of the data,
a. the number of batteries should be represented on the x - axis.
b. the brightness of the flashlight bulb should be represented on the x - axis.
c. it doesnt matter which variable he places on the x - axis.
d. he will need more information before deciding where to place the variables.
- which of the following lists of mass units are arranged in order from smallest to largest?
a. gigagram, microgram, milligram, kilogram, megagram
b. microgram, milligram, centigram, kilogram, gigagram
c. milligram, centigram, microgram, kilogram, gigagram
d. megagram, centigram, milligram, kilogram, gigagram
- the si base unit used to measure mass is the
a. meter.
b. gram.
c. kilogram.
d. liter.
- the radius of earth is 6 370 000 m. express this measurement in km in scientific notation with the correct number of significant digits.
a. 6.37×10^6 km
b. 6.37×10^3 km
c. 637×10^3 km
d. 63.7×10^4 km
- three values were obtained for the mass of a metal bar: 8.83 g; 8.84 g; 8.82 g. the known mass is 10.68 g. the values are
a. accurate.
b. precise.
c. both accurate and precise.
d. neither accurate nor precise.
use the graph for the next question
- which of the following equations best describes the graph above?
a. y = 2x
b. y = x
c. y = x^2
d. y = 1/2x
簡要解釋:
- 對於第一題,在繪製圖表時,自變量(如增加的電池數)通常放在x軸,因變量(如手電筒燈泡亮度)放在y軸。
- 第二題,質量單位從小到大的順序是微克(microgram)、毫克(milligram)、克(gram)、千克(kilogram)、 兆克(megagram)。
- 第三題,國際單位制中質量的基本單位是千克(kilogram)。
- 第四題,將地球半徑從米轉換為千米,$6370000m = 6370km$,用科學記數法表示為$6.37\times10^{3}km$。
- 第五題,多次測量值$8.83g$、$8.84g$、$8.82g$彼此接近,説明精密度高,但與真實值$10.68g$相差較大,説明準確度不高。
- 第六題,從圖中可知直線斜率為1,截距為0,其方程為$y = x$。
答案:
- 答案:a. 增加的電池數應該表示在x軸上。
- 答案:b. microgram, milligram, gram, kilogram, megagram
- 答案:c. kilogram
- 答案:c. $6.37\times10^{3}km$
- 答案:b. precise
- 答案:b. $y = x$
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簡要解釋:
- 對於第一題,在繪製圖表時,自變量(如增加的電池數)通常放在x軸,因變量(如手電筒燈泡亮度)放在y軸。
- 第二題,質量單位從小到大的順序是微克(microgram)、毫克(milligram)、克(gram)、千克(kilogram)、 兆克(megagram)。
- 第三題,國際單位制中質量的基本單位是千克(kilogram)。
- 第四題,將地球半徑從米轉換為千米,$6370000m = 6370km$,用科學記數法表示為$6.37\times10^{3}km$。
- 第五題,多次測量值$8.83g$、$8.84g$、$8.82g$彼此接近,説明精密度高,但與真實值$10.68g$相差較大,説明準確度不高。
- 第六題,從圖中可知直線斜率為1,截距為0,其方程為$y = x$。
答案:
- 答案:a. 增加的電池數應該表示在x軸上。
- 答案:b. microgram, milligram, gram, kilogram, megagram
- 答案:c. kilogram
- 答案:c. $6.37\times10^{3}km$
- 答案:b. precise
- 答案:b. $y = x$