1 Physics 20 10 Summer 2016 Richard In "chretsen Exam 2
Summer 2016 Physics 20 10 Richard In "chretsen Exam 2 Name: UNID: TA: \r*(_ v<9 r A. B. 1 For each of the following trajectories, draw in the specified vectors at the 5 points along the object's path. Keep in mind that a vector's length displays its magnitude. x-component of velocity y-component of velocity total velocity acceleration For each of the following quantities, state whether it is a vector or a scalar. Displacement vixArt- Speed IC^A*^ Tension force Velocity MLi.kfbr Mass ^u^X^ Distance Travelled Coefficient of Static Friction C. Two strings are tied to a box of mass 56.0 kg that rests on africtionless table as shown by this top view. Each string pulls with a force of magnitude 30.0 N. 1. Draw a free-body diagram of this top view. Be careful...you may not be used to this vantage point. Top View 5 T, 2. Calculate the x-component and y-component of the acceleration that the box feels. Then, find the total acceleration vector that the box feels. T. v*% 0s) - T, F • ^ T L* *\ dL "• ^ " - " (T \ Physics 20 10 Summer 2016 Richard Ingcbrctscn Exam 2 Name: UNID: TA: fl/JU 2 You are standing in an elevator with two scales. Assume that if you are standing on both scales, your weight is evenly distributed between both of them. Assume that you have a mass of 65.0 kg. Use the blank force vs. time graph provided to complete the following. Read all parts first. Then, label each axis with the appropriate quantities, numerical labels and units of measure. Using the following information, draw lines representing the readings given by both scales for a 10 second elevator ride. Clearly label these lines "Scale 1" and "Scale 2." ^•--Tt For the first 4 seconds of your elevator ride, you are standing on both scales. After that, you are only standing on Scale 1 For the first 2 seconds of your ride, the elevator accelerates upward. The magnitude of the acceleration is 1.0 m/s2. Then, the elevator moves upward at a constant speed for 4 seconds. After that, the elevator has a downward acceleration to come to a stop. ( The magnitude of that acceleration is also 1.0 m/s2 and lasts for 2 seconds. Finally, the elevator is at rest for 2 seconds. 0 — 0 SC^.(A«*3 . (A. a : ^ |V. M o ivu - l*h\s 2010 S u m m e r 201 (> R i c h a r d lr»<u'bri'lsen I Exam 1 Name: UNID: TA: A. 3 S^ks^i^ A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 5.3 m/s. hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building isj.0jn below the jumping-off point. Find the maximum value for D. ^X 6 0 t *' J t . B. In the figure, two blocks are connected to each other by a massless string over a frictionless^mllev. The mass of the block on the left incline is 6.00 kg. Assuming the coefficient of static friction us equals 0.542 for all surfaces, find the range of va}ues_of the mass of the block on the right incline so that the system is in equilibrium. ..» 0.542 T -,r-*|t*/ As you ride TRAX home, you notice a cyclist riding alongside the train. The train has a velocity +40 injgh with respect to the road, and the cyclist is keeping up with traffic at+25mpji_with respect to the road. (This guy's probably a pro cyclist) What is the cyclist's velocity with respect to i train? \/. = + *o ~-pk v, * l»h\sics 2010 S u m m e r 2016 kicluml In^ebretsen Exam 2 Name: LJNID: TA: £<teiuve/ A. B. 4 Three boxes are lined up on africtionless table so that they are touching each other as shown in the figure. Box A has a mass of 20 kg, box B has a mass of 30 kg^ and box C has a mass of 50 kg. If an external force (F) pushes on box A toward the right, and the force that box B exerts on box C is 400 N, find the acceleration of the boxes and the value of the external force F. vow ^ea? &e/f; Wearing a seat belt causes the immense forces generated in collisions to be transferred to more sturdy parts of your body, resulting in bruising rather than disability. In one collision scenario, a 55 kg. person rides hi a car travelling at 29.1 m/s (which is about 65 mph). Upon hitting another vehicle, it takes a distance of 1.2 m to come to a stop. Calculate the amount offeree that the seat belt exerts to bring this person to a stop. Then, as you leave this test, remember that without wearing a seatbelt, this force would instead be exerted on the person's head by the steering wheel or windshield. v* - This part will be graded. Answer "Right" or "Wrong." I commit to wearing a seat belt whenever I am in a moving vehicle.