is described as the change in potential energy per unit charge in an electric field. Question 18 options:

Gravitational field

Electric potential difference

Electric field

Electric field line

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?