Which of the following is an example of informal writing?

an academic essay written for a college class using 3rd person
a personal letter written to a friend using 1st person
a report on accidents in a manufacturing plant
an insurance claim written by a doctor

You can decrease the resistance of a length of wire by

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.

Acar of mass 800kg is moving at a speed of 2.2m/s.