Question

A student measured the power of a motor operating at different temperatures. The student recorded a total of 11 measurements, one at each 2 degree interval between 10°C and 30°C. Which change in the procedure would most improve the validity of conclusions based on this investigation?


A.
Increasing the number of variables

B.
Decreasing the range of the independent variable

C.
Repeating the experiment several times

D.
Producing a graph of numerical observations

Answer 1

C. Repeating the experiment several times

By repeating the experiment several times, the student can ensure that the results are consistent and reliable. This will improve the validity of the conclusions drawn from the investigation.

Answer 2

Which of these represents the freezing point of water in correct SI units?


A.
0°C

B.
0°F

C.
32°F

D.
-273°C

Answer 3

D. -273°C

The freezing point of water in correct SI units is 0°C, which is equivalent to -273°C.