If your velocity is [2 m/s and then 5 m/s] North with an acceleration of 2m/s², in what time interval did this acceleration takes place?

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water