What evidence exists that an electric current produces a magnetic field, and what
evidence exists that a changing magnetic field produces an electric current?
Develop two hypotheses to test the question.

Regarding the history of the universe, which of the following is true? all the chemical elements were created during the big bang, but some have been modified since that time as a result of radioactive decay. the earth formed quickly after the big bang. all the current stars in our galaxy formed about the same time billions of years ago. key elements of which earth and life are made, including carbon, oxygen, and iron, did not exist when the universe was born and were created later in stars.

When conducting this experiment, some procedures call for heating the substance several times and recording the mass after each heating, continuing until the mass values are constant. explain the purpose of this process and how it might reduce errors.

Acar has a mass of 1500. it is traveling north a 8 m/s. what is the cars momentum