If an object has a kinetic energy of 30 J and a mass of 34 kg , how fast is the object moving?

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

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?