General Physics I with Calculus

Correct Part C What is the change in total kinetic energy of the two skaters as a result of the collision? ANSWER: Correct Problem 8.46 A 1200-kg station wagon is moving along a straight highway at 12.0 m/s. Another car, with mass 1800 kg and speed 20.0 m/s, has its center of mass 40.0 m ahead of the center of mass of the station wagon . Part A Find the position of the center of mass of the system consisting of the two automobiles. ANSWER: Correct -37.97 from the Rebecca's original direction  -678 J 16.0 m behind the leading car Part B Find the magnitude of the total momentum of the system from the above data. ANSWER: Correct Part C Find the speed of the center of mass of the system. ANSWER: Correct Part D Find the total momentum of the system, using the speed of the center of mass. ANSWER: Correct Problem 8.54 A rocket is fired in deep space, where gravity is negligible. In the first second it ejects of its mass as exhaust gas and has an acceleration of 14.9 . Part A What is the speed of the exhaust gas relative to the rocket? ANSWER: Correct 5.04 ! 10 4 kg ⋅ m/s 16.8 m/s 5.04 ! 10 4 kg ⋅ m/s 1 160 m/ s 2 2.38 km/s Problem 8.56 A single-stage rocket is fired from rest from a deep-space platform, where gravity is negligible. Part A If the rocket burns its fuel in a time of 50.0 s and the relative speed of the exhaust gas is , what must the mass ratio be for a final speed of 8.00 km/s (about equal to the orbital speed of an earth satellite)? ANSWER: Correct Problem 8.65 A railroad handcar is moving along straight, frictionless tracks with negligible air resistance. In the following cases, the car initially has a total mass (car and contents) of 170 and is traveling east with a velocity of magnitude 4.80 . Find the final velocity of the car in each case, assuming that the handcar does not leave the tracks. Part A An object with a mass of 22.0 is thrown sideways out of the car with a speed of 2.30 relative to the car's initial velocity. ANSWER: Correct Part B An object with a mass of 22.0 is thrown backward out of the car with a velocity of 4.80 relative to the initial motion of the car. ANSWER: Correct Part C = 2100 m/s v ex / m m 0 v 45.1 kg m/s kg m/s 4.80 m/s east kg m/s 5.51 m/s east kg m/s An object with a mass of 22.0 is thrown into the car with a velocity of 6.00 relative to the ground and opposite in direction to the initial velocity of the car. ANSWER: Correct Score Summary: Your score on this assignment is 98.6%. You received 98.59 out of a possible total of 100 points. kg m/s 3.56 m/s east

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