Rocket activity continued Click for definition of terms Maximum height of rocket = H + h Mass of rocket before firing = mi Mass of rocket after fuel is exhausted = mf Time from A to C (stopwatch) = tAC Time from A to B = tAB Time from B to C = tBC Average drag from B to C = FBC Vertical component of AB = xAB Vertical component of BC = xBC Distance between observers = D Sight angles of observers = X1 , X2 Speed of rocket at B = vB Hide the terms   A. Calculating an Estimate of xAB • Estimate the average acceleration between A and B Hint • Estimate the speed at B • Estimate xAB Hint B. Calculating an Estimate of xBC • If air resistance is (temporarily) ignored what is the net force on the rocket as it moves from B to C? Hint Hide hint xAB is calculated by the expression below. Average speed X time = distance Average speed is calculated using the expression below ( 0 + vB) / 2 = average speed Hence the distance from A to B is given by the expression below. tAB X average speed = distance • What is the acceleration of the rocket as it moves from B to C?   Hide the hint • Use the estimate of vB obtained earlier to calculate a value of xBC. Hint Hide the hint Note that for the motion from A to B speed increases from 0 to vB , while for the motion from B to C the speed changes from vB to 0 • Add xAB and xBC to obtain a value for the height reached by the rocket. • Use your measurements of D, X1, X2 to determine a value for H. Estimate h. How does your value for H + h compare with your value for xAB + xBC ? Why do you think they are different? Continue