How are electromagnets different from regular magnets?
They can be turned on and off.
Their polarity can be reversed.
Their strength can be changed.
All of the above.
None of the above.

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

What properties of a moving object are used in determining the object's energy of motion

Write down two additional questions about earth's magnetic field that will make your presentation more informative.