What does rubbing the PVC pipe in your hair accomplish. What does it mean to "hold a charge" and why did this change the interaction of the tape in the lab or the PVC pipe?

Let the ed50 of a recreational drug be defined as the amount required for 50% of a test group to feel high or get a buzz. if the ed50 value of ethanol is 470 mg/kg body mass, what dose would a 70 kg party goer need to quickly consume in order to have a 50% chance of getting a buzz? 235 mg 470 mg 32,900 mg 35,000,000 mg

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

What characteristics does a earthquake have