Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Part A Review | Constants Let the speeds of drivers E and N prior to the collision be denoted by ve and v, respectively. Find v, the square of the speed of the two-car system the instant after the collision. Express your answer terms of ve and vn. View Available Hint(s) 0 ? v2 Figure E E Submit < 1 of 1 Part B Point of collision What is the kinetic energy K of the two-car system immediately after the collision? Express your answer in terms of ve, un, and m. View Available Hint(s) ? K < 1 of 5 > + Traffic Accident Analysis Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Part C Write an expression for the work Wfric done on the cars by friction. Review Constants Express your answer symbolically in terms of the mass m of a single car, the magnitude of the acceleration due to gravity g, the coefficient of sliding friction , and the distance d through which the two-car system slides before coming to rest. View Available Hint(s) Wfric ? Figure E E < 1 of 1 > Submit Part D Point of collision Using the information given in the problem introduction and assuming that the third driver is telling the truth, determine whether driver N has reported his speed correctly. Specifically, if driver E had been traveling with a speed of exactly 12 meters per second before the collision, what must driver N's speed have been before the collision? Express your answer numerically, in meters per second, to the nearest integer. Take g, the magnitude of the acceleration due to gravity, to be 9.81 meters per second per second. View Available Hint(s) ? < 1 of 5 > Review | Constants ? Wfric Traffic Accident Analysis Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Submit Part D Figure E E < 1 of 1 > Point of collision Using the information given in the problem introduction and assuming that the third driver is telling the truth, determine whether driver N has reported his speed correctly. Specifically, if driver E had been traveling with a speed of exactly 12 meters per second before the collision, what must driver N's speed have been before the collision? Express your answer numerically, in meters per second, to the nearest integer. Take g, the magnitude of the acceleration due to gravity, to be 9.81 meters per second per second. View Available Hint(s) Un = Submit Provide Feedback ? m/s Next > Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Part A Review | Constants Let the speeds of drivers E and N prior to the collision be denoted by ve and v, respectively. Find v, the square of the speed of the two-car system the instant after the collision. Express your answer terms of ve and vn. View Available Hint(s) 0 ? v2 Figure E E Submit < 1 of 1 Part B Point of collision What is the kinetic energy K of the two-car system immediately after the collision? Express your answer in terms of ve, un, and m. View Available Hint(s) ? K < 1 of 5 > + Traffic Accident Analysis Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Part C Write an expression for the work Wfric done on the cars by friction. Review Constants Express your answer symbolically in terms of the mass m of a single car, the magnitude of the acceleration due to gravity g, the coefficient of sliding friction , and the distance d through which the two-car system slides before coming to rest. View Available Hint(s) Wfric ? Figure E E < 1 of 1 > Submit Part D Point of collision Using the information given in the problem introduction and assuming that the third driver is telling the truth, determine whether driver N has reported his speed correctly. Specifically, if driver E had been traveling with a speed of exactly 12 meters per second before the collision, what must driver N's speed have been before the collision? Express your answer numerically, in meters per second, to the nearest integer. Take g, the magnitude of the acceleration due to gravity, to be 9.81 meters per second per second. View Available Hint(s) ? < 1 of 5 > Review | Constants ? Wfric Traffic Accident Analysis Consider the following two-car accident: Two cars of equal mass m collide at an intersection. Driver E was traveling eastward, and driver N, northward. After the collision, the two cars remain joined together and slide, with locked wheels, before coming to rest. Police on the scene measure the length d of the skid marks to be 9 meters. The coefficient of friction between the locked wheels and the road is equal to 0.9. (Figure 1) Each driver claims that his speed was less than 14 meters per second (about 31 mph). A third driver, who was traveling closely behind driver E prior to the collision, supports driver E's claim by asserting that driver E's speed could not have been greater than 12 meters per second. Take the following steps to decide whether driver N's statement is consistent with the third driver's contention. Submit Part D Figure E E < 1 of 1 > Point of collision Using the information given in the problem introduction and assuming that the third driver is telling the truth, determine whether driver N has reported his speed correctly. Specifically, if driver E had been traveling with a speed of exactly 12 meters per second before the collision, what must driver N's speed have been before the collision? Express your answer numerically, in meters per second, to the nearest integer. Take g, the magnitude of the acceleration due to gravity, to be 9.81 meters per second per second. View Available Hint(s) Un = Submit Provide Feedback ? m/s Next >
Expert Answer:
Related Book For
Posted Date:
Students also viewed these physics questions
-
Beth Johnson takes out a 30-year, $575,000 mortgage at 2.99%. Mortgage payments are due at the end of each month, starting with the first month. What is the amount of each mortgage payment? What is...
-
Flip a coin until the second head comes up. Let X be the number of flips needed to get the second head. What is the E(X)?
-
Ford motor company has a beta of 0.95. If the expected return on the market is 7.2%, and the risk free rate is 1.1%, what is the cost of equity capital according to the CAPM?
-
What does a field technician need to be aware of when disconnecting the BNC connector on a proximeter of a loaded, running machine?
-
The beta coefficient for Stock C is bC = 0.4 and that for Stock D is bD = 0.5. (Stock Ds beta is negative, indicating that its rate of return rises whenever returns on most other stocks fall. There...
-
Del Gato Clinic's cash account shows an $15,282 debit balance and its bank statement shows $13,903 on deposit at the close of business on June 30. a. Outstanding checks as of June 30 total $1,596. b....
-
You have been asked to calculate how many units need to be sold to break even, based on the costs provided BELOW. Assume that only one conference will be attended and the estimated expenses...
-
address the following: What are the main considerations for program, portfolio, and project management? Discuss whether procurement can be eliminated or replaced by alternate organizational...
-
After you have read Beccaria and Lombroso, please provide a brief summary on these two theories of crime. Are these classical theories still relevant today? What are some of the criticism around...
-
Camille also wants to summarize the number of discounted products by product type and calculate their total and average discounted prices. In cell K2, enter a formula using the COUNTIF function that...
-
Managing project expectations is a central role for the project manager. How do bottlenecks limit this functionality and how can they be addressed? Under what circumstances would a project need to be...
-
23. Sally has hidden her brother's birthday present somewhere in the backyard. When writing instructions for finding the present, she used a coordinate system with each unit on the grid representing...
-
You need to do MT project research. Describe the process of defining a research problem and explore at least three research methods that might be used to resolve the problem. One research method must...
-
Teasdale Inc. manufactures and sells commercial and residential security equipment. The comparative unclassified balance sheets for December 31, 2015 and 2014 are provided below. Selected missing...
-
Eq. 7.36a is written for the conservation of momentum in y direction. Obtain Eq. 7.36-b wherein the stream function is independent variable. Eq. 7.36(a,b) y - v v +(1-y/R)v- + momentum: u u R-y + R P...
-
Using Maslen method, find the approximate value of pressure and density at the junction of the sphere and the cone of Problem 7.29 at Mach number 8. Problem 7.29 An empirical way to determine shock...
-
Show that the derivative of the boundary layer edge velocity is given by Eq. 7.64 for the figure given below. Eq. 7.64 M>>1 Ue dx R dy/dx = 1/R
Study smarter with the SolutionInn App