select qll the ways to make an electromagnet stronger: A) increase the number of coils, B) add a battery, C) heat it up, D) use a sronger battery, E) add a second nail​

In what direction does the medium move relative to the direction of the wave? explain.

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

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion