Question 1 0.25 pts Question 1 Consider the collision of two identical hockey pucks on a smooth ice rink. Various but not all components of the velocities of the two pucks before and after the collision have been determined and are recorded in the table below. BEFORE BEFORE AFTER AFTER vxlcm/s) vy(cm/s) vx(cm/s) vylcm/s) Puckl 21 35 -13 10 Puck2 -46 15 Assume that friction with ice is negligible. Complete the missing entries. (NOTE: The masses of the pucks are not provided because they are not needed... Do you see why?) Find vx after the collision for puck 2, in cm/s. ~12 \\/ \\/ (9 Time Ru Attempt d 3 Hours. D Question 2 0.25 pts Question 2 Find vy after the collision for puck 2, in cm/s. 40Question 3 0.25 pts Question 3 What percentage of the total kinetic energy of the two-puck system is lost in the collision? 49.76 k?) Question 4 0.25 pts Question 4 In the lab, you will be analyzing the collisions of two pucks on an air table. The pucks are connected to an electric pulsing system that provides a brief electric pulse 60 times per second. Each pulse results in a spark being produced between the puck and the table. By placing a sheet of paper between the puck and the table, we can use the sparks to record the position of the pucks at regular intervals. The trails of spark marks look like this: How much time passes between two consecutive marks, in MILLISECONDS? 16.7 Question 5 0.25 pts Question 5 Using a ruler, we determine that the distance between points X and Y in the figure below is 5.5 cm. Point Y Puck 1 Point X Puck 2 What is the speed of puck 2 after the collision, in cm/s? 55Question 6 0.25 pts Question 6 In our experimental setup, the frequency of the spark generator is very steady. This means that the uncertainty associated with the time intervals between consecutive marks introduces a negligible contribution to the total error, so we do not need to worry about this. However, we will measure distances with a cheap plastic ruler, and that imposes limitations to the precision of the measurement. A safe estimation of the uncertainty to our measurement of the distance between points X and Y due to the precision of the ruler is $0.1 cm (both due to the cheap construction of the measuring tool and due to reading errors). As discussed in previous labs, this uncertainty needs to be propagated through calculations. What is the uncertainty in the speed of puck 2 after the collision, in cm/s? Round up your result to two signicant gures. 1V1 Question 7 0.25 pts Question 7 Since velocities are vectors, we need to worry about direction. Let us take the x axis along the initial direction of puck 1, and y axis perpendicular to that and pointing up, as shown below. Using a protractor, we determine the angle between the x-axis and the direction of motion of puck 2 after the collision, Gama. = 23. Puck 2 Using this angle, we can now determine the components of the velocity of puck 2 after the collision. For instance, nd the component in the x direction, vx, in cm/s. 50.6 Question 8 0.25 pts Question 8 In question 6, we obtained the uncertainty in the magnitude of the velocity. The precision of our measurements with a protractor has limitations, so there is also an uncertainty in any measured angle. Both uncertainties will need to be propagated to the components. Let us take the uncertainty in 02, final to be +0.50. Using this and the uncertainty in the speed from question 6, what is then the uncertainty in the x component of the velocity, in cm/s? (This is the process we learned in lab FV - Forces and Vectors. You can review the minilecture on propagation of uncertainty that was part of Prelab FV.) Enter your answer with one significant figure