two waves on a string have the following wave functions: 3x 4t- where y, and x are measured in cm, and t is measured in seconds. a. at what time do the two waves completely cancel each other? b. at what position on the string is the total disturbance always zero? c. show that these two waves satisfy the 1-d wave equation.

When fat comes in contact with sodium hydroxide, it produces soap and glycerin. determine whether this is a physical change or a chemical change. explain your answer

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?