The periodic wave in the diagram below has a frequency of 40 hertz. What is the speed of the wave?

answers:
A. 120 m/s
B. 60 m/s
C. 27 m/s
D. 13 m/s

11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge