If there are two trains speeding toward each other, what is the acceleration of coins tossed at algebra instructors? Item: Abstract Math Produces Tangible Learning, Study Finds Leland was ...

Simulates water in a ripple tank. Demonstrates basic wave mechanics: wave reflection, diffraction, and superimposition. Press "P" to pause the simulation and "R" to reset it. Left-click to add a drop ...

Modal verbs are verbs that indicate likelihood, ability, permission or obligation.