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Item 11 Item 11 11 of 12 Review I Constants A spring is 17.2 cm long when it is lying Part A on a table. One end is then attached to a hook and the other end is pulled by a force that increases to 26.0 N, causing What is the force constant of this spring? the spring to stretch to a length of Express your answer in newtons per meter. 19.5 cm. For related problem-solving tips and strategies, you may want to view a Video emplates Symbols undo redo reset keyboard shortcuts help, Tutor Solution of Work done on a spring scale. k = N/m Submit Request Answer Part B How much work was required to stretch the spring from 17.2 cm to 19.5 cm ? Express your answer in joules. Templates Symbols undo redo reset keyboard shortcuts help, W J Submit Request Answer Part C How long will the spring be if the 26.0 N force is replaced by a 52.0 N force? Express your answer in centimeters. Templates Symbols undo redo reset keyboard shortcuts help, d = cm Submit Request AnswerItemS ( SOHO > = _ _ 4 ' I Review I PA,y "EAUAW (1000 kg)(15 111/9) 1.5 x 10 kg m/s Constants 123,3 = 0233,: = (2000 kg)(10 m/s) = 2.0 x 1041:; m/s Let's begin by calculating the total P3,? = \"'33,? = (2000 kEXU) = 0 momentum of two moving objects. Suppose a small compact car with a There are no 2 components of velocity or momentum. mass of 1000 kg is traveling north on Morewood Avenue at a speed of 15 m/s. At the intersection ol' Morewood and Firth The components of the total momentum I? are Avenues, it collides with a truck with a p2 = mmAJ- "13,131,; 0 + 2.0 x 10'I kg - m/s mass of 2000 kg that is traveling east on = 2.0 >- y (north) Previous Answers Request Answer a: Incorrect; Try Again; 5 attempts remaining Provide Feedback Next ) mA : 1000 kg Item 6 In this example, we will consider conservation of momentum in an isolated system consisting of an astronaut and a wrench. An astronaut is floating in space 100 m from her ship when her safety cable becomes unlatched. She and the ship are motionless relative to each other. The astronaut's mass (including space suit) is 100 kg; she has a 1.0 kg wrench and only a 20 minute air supply. Thinking back to her physics classes, she devises a plan to use conservation of momentum to get back to the ship safely by throwing the wrench away from her. In what direction should she throw the wrench? What is the magnitude of her recoil velocity if she throws the wrench at 10 m/s? Will her recoil velocity be great enough to get her back to the spacecraft before she runs out of air? Figure 1 of 1 mA =1m k9 33\"\" m. = 1.0 kg [gs100 m>i'l >X \\TJ System - astronaut Item 7 Figure VAix = 2.0 m/s VB,ix = -2.0 m/s