# 0 v kms 3870 kms 6700 kms 2830 kms 6700 kms 6700 0

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Chapter 2 / Exercise 56
College Physics
Serway/Vuille
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0 v km/s 3870 km/s 6700 km/s 2830 km/s 6700 km/s 6700 0 km/s 8900 km/s 6700 km/s 2200 km/s 200 , 11 km/s 6700 km/s 4500 5 4 3 2 1 v v v v 64. (a) Use the distance and velocity data in Figure 3.64 to find the rate of expansion as a function of distance. (b) If you extrapolate back in time, how long ago would all of the galaxies have been at approximately the same position? The two parts of this problem give you some idea of how the Hubble constant for universal expansion and the time back to the Big Bang are determined, respectively. 7 H v d t [email protected] 26 Mar 2018
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Chapter 2 / Exercise 56
College Physics
Serway/Vuille
Expert Verified
Openstax College Physics Chapter 3 65. An athlete crosses a 25-m-wide river by swimming perpendicular to the water current at a speed of 0.5 m/s relative to the water. He reaches the opposite side at a distance 40 m downstream from his starting point. How fast is the water in the river flowing with respect to the ground? What is the speed of the swimmer with respect to a friend at rest on the ground? [email protected] 26 Mar 2018
66. A ship sailing in the Gulf Stream is heading 25.0 west of north at a speed of 4.00 m/s relative to the water. Its velocity relative to the Earth is m/s 4.80 5.00 west of north. What is the velocity of the Gulf Stream? (The velocity obtained is typical for the Gulf Stream a few hundred kilometers off the east coast of the United States.) v SE SW SE WS WE v v v v v
Openstax College Physics Chapter 3 67. An ice hockey player is moving at 8.00 m/s when he hits the puck toward the goal. The speed of the puck relative to the player is 29.0 m/s. The line between the center of the goal and the player makes a 90.0 angle relative to his path as shown in Figure 3.65 .