A converging lens with a focal length of 50 cm and a diverging lens with a focal length of -64 cm are placed 239 cm apart. A 2.1 cm tall object is 70 cm in front of the converging lens. a) Calculate the distance between the image and diverging lens.
b) Calculate the image height.

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

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?

You can melt ice by applying pressure because the solid/liquid line has a slope.