385
Physics Units Level: High School
Does a negative acceleration necessarily imply that a body is slowing down ? What (or who ) determines the sign if the acceleration in a particular problem ?
384
Physics Units Level: High School
By definition , 1 inch precisely equals 2.5400 centimeters . A length is measured to be 3.2 feet , and after conversion to centimeters this length is reported to be 97.54 centimeters . Explain what is wrong with this conclusion .
377
Physics Units Level: High School
Significant figures
Alice measures the diameter of a CD and gets a value of 117 mm , so she reports the value of the circumference as 367.5663404700058 mm . What wrong with this picture ?
Since the direct measurement has three significant figures (d=117 mm) , the indirect measurement , that is the circumference is calculated from it . Thus it can’t have more than 3 significant figures in the answer .