A skyrocket explodes 78 m above the ground. Three observers are spaced 70 m apart, with observer A directly under the point of the explosion. A B C 78 m 70 m 70 m Find the ratio of the sound intensity heard by observer A to that heard by observer B. For practical purposes, you may treat each observer as a point on the ground.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

What happens to an isotope during radioactive decay?

Which composition of water moves to begin a deepwater current?