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# (7%) Problem 11: A student launches a small rocket which starts from rest at ground level. At a height h = 2.09 km, the

## (7%) Problem 11: A student launches a small rocket which starts from rest at ground level. At a height h = 2.09 km, the rocket reaches a speed of v = 291 m/s. At that height, the rocket runs out of fuel, so there is no longer any thrust propelling it. Take the positive direction to be upward. The drawing is not to scale. h Uf 33% Part (a) Assuming constant acceleration, what is the rocket's acceleration, in meters per squared second, during the period from its launch until it runs out of fuel? a = 20.24 m/s Correct! >33% Part (b) After the rocket's engine turns off at a height of h = 2.09 km, it continues to move upward due to the velocity that it reached. What is the rocket's acceleration, in meters per squared second, during the period from engine shutoff until it returns to the ground? Ignore air resistance. a = -9.81 a = -9.810 m/s Correct! 33% Part (c) Calculate the maximum height, in meters above ground level, that the rocket reaches. hmax = m sin( cos tan () cotan() asin() acos() atan() cosh acotan() sinh() 7 89 E4 5 6 1 2 3 tanh Degrees cotanh() + - 0 Radians VO BACKSPACE Submit Hint Feedback I give up! Hints: 1 for a 1% deduction. Hints remaining: 2 -When the rocket reaches height h, it is still moving up. HOME Grade Summary Deductions Potential 28% 72% Submissions Attempts remaining: 7 (5% per attempt) detailed view 1 5% END 2 5% DEL CLEAR 3 5% 4 5% Feedback: 1 for a 2% deduction No meaningful feedback available for the current submission. (7%) Problem 12: Two cars are heading toward one another. The cars were initially at rest and separated by a distance of 1400 m. Car A is moving with an acceleration of 8 m/s. Car B is moving with an acceleration of -9 m/s. Assume that they are on the x-axis. @theexpertta.com - tracking id: 5T88-75-0E-46-BB99-46076. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictly forbidden. Doing so may result in termination of your Expert TA Account. 25% Part (a) At what elapsed time, in seconds, do the cars meet? t = 12.84 s Correct! 25% Part (b) What is the displacement, in meters, of Car A at the time the cars meet? A = 655.62 = A 655.6 m Correct! TB = 661.43 25% Part (c) What is the displacement, in meters, of Car B at the time the cars meet? TB = 661.4 m X Attempts Remain 25% Part (d) Now, assume that both cars start with an initial velocity. Car A's initial velocity is v,0 = 44 m/s and Car B's initial velocity is (v_\text {B,0}\) = -14 m/s. At what time, in seconds, do they meet? t2 = || S 1 2 3 Grade Summary Deductions Potential Submissions 5% 95% Attempts remaining: 11 (5% per attempt) detailed view END 1 sin( cotan() cos tan atan) asin() acos() acotan() sinh() cosh() tanh() cotanh() Degrees Radians ( ) 7 E4 8 9 HOME 5 6 * + - 0 VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 3 Feedback: 2% deduction per feedback. 5% (7%) Problem 13: Use the position vs. time graph shown in figure to the right to answer the following questions. On the plot. the x-intervals are 4x = 11 m and the time intervals are At = 15 s. @theexpertta.com - tracking id: 5T88-75-0E-46-BB99-46076. In accordance with Expert TA's Terms of Service. copying this information to any solutions sharing website is strictly forbidden. Doing so may result in termination of your Expert TA Account. 25% Part (a) What is the velocity of segment 1? V = m/s sin() cos( tan( cotan() asin() acos() ( ) 789 E4 56 atan() acotan() cosh() tanh() cotanh() sinh() * 1 2 3 + - 0 Degrees Radians VO BACKSPACE Submit Hint Feedback I give up! Hints: 1% deduction per hint. Hints remaining: 3 25% Part (b) What is the velocity of segment 2? A 25% Part (c) What is the velocity of segment 3? 25% Part (d) What is the velocity of segment 4? HOME x (3) 1 4 Axt t Otheexpertta.com Grade Summary Deductions Potential Submissions 5% 95% Attempts remaining: 11 (5% per attempt) detailed view END 1 DEL CLEAR Feedback: 2% deduction per feedback. 5%

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