Adoctor has a patient blow on one side of a u-shaped tube that is partially
filled with water and has a ball floating on the other side, as shown in the
image below. if the ball rises with a force of 150 n, what pressure did the
patient apply to his side of the tube?
direction of
blowing air
area = 0.001 m2
a. 150 pa
b. 100,000 pa
c. 150,000 pa
d. 0.15 pa

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.