The object distance for a concave lens is 8.0 cm, and the image distance is 12.0 cm. the height of the object is 4.0 cm. what is the height of the image?

0.50 cm
2.7 cm
18 cm
6.0 cm

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

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?

Current from a charged capacitor lights a bulb. as time goes on the brightness of the