An important news announcement is transmitted by radio waves to people who are 51 km away, sitting next to their radios, and by sound waves to people sitting across the newsroom, 3.6 m from the newscaster. Take the speed of sound in air to be 348 m/s. What is the difference in time that the message is received

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

The scalar triple product computes the magnitude m of the moment of a force vector f about a specified line. it is m = (r × f) · n, where r is the position vector from the line to the point of application of the force and n is a unit vector in the direction of the line. use matlab to compute the magnitude m for the case where f = [12, −5, 4] n, r = [−3, 5, 2] m, and n = [6, 5, −7].