You calculate the density of a block of aluminum to be 2.68 g/cm3. You look up the density of a block of aluminum at room temperature and find it to be 2.70 g/cm3. This results in an error of 0.7%. (a) Is this a systematic or random error? Explain why.

Systematic errors.

Explanation:

The density of the aluminium was calculated by a human and this is not natural but can be due to errors in the calibration of the scale for measuring the weight or taking readings from the measuring cylinder.

Random errors are natural errors. Random errors in experimental measurements are caused by unknown and unpredictable changes in the experiment. Systematic errors are due to imprecision or problems with instruments.

unlike poles attract

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.