La rapidez del sonido en el agua es de 1.498 m/s. Se envía una señal de sonar desde un barco a un punto que se encuentra debajo de la superficie del agua. 1,8 s más tarde se detecta la señal reflejada. ¿Qué profundidad tiene el océano por debajo de donde se encuentra el barco?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?