Ok plz help this is my entrance exam question for physics in grade 9 (yes i am moving to a new school again) calculate the POWER of a man who pushes a box with a force of 40 n to move it at a distance of 3 meters in 4 secs plz help

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Is the time in tennessee the same as florida

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?