In an experiment to determine speed of sound in air, a drum at a point

150m from a vertical wall was struck

at varying frequency while listening

to the echo. The echo coincides with

the sound from the drum at a time

when to successive strikes were

made within a time of 18.5s.

i. Determine the time taken for

an echo to be heard

ii. Determine the speed of sound

in air at the place

iii. What difference would you

expect if the experiment was

repeated on a colder day?​

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.