21st Century Astronomy 6E
6th Edition
ISBN: 9780393690675
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton
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Chapter 20, Problem 5QP
To determine
The evidence of a supermassive black hole at the centre of the Milky Way.
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Please draw a sketch and a FBD
8.69
Spheres A (mass 0.020 kg), B (mass 0.030 kg), and C (mass
0.050 kg) are approaching the origin as they slide on a frictionless air
table. The initial velocities of A and B are given in Fig. P8.69. All three
spheres arrive at the origin at the same time and stick together. (a) What
must the x- and y-components of the initial velocity of C be if all three
objects are to end up moving at 0.50 m/s in the +x-direction after the col-
lision? (b) If C has the velocity found in part (a), what is the change in the
kinetic energy of the system of three spheres as a result of the collision?
Figure P8.69
UC
C
B
UB=0.50 m/s
60°
VA = 1.50 m/s
A
8.36 A 1050 kg sports car is moving westbound at 15.0 m/s on a level
road when it collides with a 6320 kg truck driving east on the same road
at 10.0 m/s. The two vehicles remain locked together after the collision.
(a) What is the velocity (magnitude and direction) of the two vehicles
just after the collision? (b) At what speed should the truck have been
moving so that both it and the car are stopped in the collision? (c) Find
the change in kinetic energy of the system of two vehicles for the situ-
ations of parts (a) and (b). For which situation is the change in kinetic
energy greater in magnitude?
Chapter 20 Solutions
21st Century Astronomy 6E
Ch. 20.1 - Prob. 20.1CYUCh. 20.2 - Prob. 20.2CYUCh. 20.3 - Prob. 20.3CYUCh. 20.4 - Prob. 20.4CYUCh. 20 - Prob. 1QPCh. 20 - Prob. 2QPCh. 20 - Prob. 3QPCh. 20 - Prob. 4QPCh. 20 - Prob. 5QPCh. 20 - Prob. 6QP
Ch. 20 - Prob. 7QPCh. 20 - Prob. 8QPCh. 20 - Prob. 9QPCh. 20 - Prob. 10QPCh. 20 - Prob. 11QPCh. 20 - Prob. 12QPCh. 20 - Prob. 13QPCh. 20 - Prob. 14QPCh. 20 - Prob. 15QPCh. 20 - Prob. 16QPCh. 20 - Prob. 17QPCh. 20 - Prob. 18QPCh. 20 - Prob. 19QPCh. 20 - Prob. 20QPCh. 20 - Prob. 21QPCh. 20 - Prob. 22QPCh. 20 - Prob. 23QPCh. 20 - Prob. 24QPCh. 20 - Prob. 25QPCh. 20 - Prob. 26QPCh. 20 - Prob. 27QPCh. 20 - Prob. 28QPCh. 20 - Prob. 29QPCh. 20 - Prob. 30QPCh. 20 - Prob. 31QPCh. 20 - Prob. 32QPCh. 20 - Prob. 33QPCh. 20 - Prob. 34QPCh. 20 - Prob. 35QPCh. 20 - Prob. 36QPCh. 20 - Prob. 37QPCh. 20 - Prob. 38QPCh. 20 - Prob. 39QPCh. 20 - Prob. 40QPCh. 20 - Prob. 41QPCh. 20 - Prob. 42QPCh. 20 - Prob. 43QPCh. 20 - Prob. 44QPCh. 20 - Prob. 45QP
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