Chapter 11 And 12 Physics

Question 1

1 / 1 point
Three galaxies, each of mass M = 4.0  1041 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0  1022 m length. The magnitude of the force the other two galaxies exert on each galaxy is
Question options:

1)
4.3  1027 N.

2)
6.4  1027 N.

3)
7.4  1027 N.

4)
8.6  1027 N.

5)
4.3  1028 N.

Question 2

1 / 1 point
Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny the system below where mass mis rE (not the Earth 's radius) distant from Earth and rP (not planet P 's radius) distant from planet P. Carla states that the mass m has escaped if FP on m = FE on M. Which one, if either, is correct, and why?
Question options:

1)
Carla, because the total gravitational force on m is zero at that point.

2)
Carla, because there is no gravitational force from Earth on m at that point.

3)
Carla, because there is no gravitational force on m from Earth when r > rE.

4)
Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth.

5)
Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.

Question 3

1 / 1 point
What is the escape speed from a planet of mass M and radius R if M = 3.2  1023 kg and R = 2.4  106 m?
Question options:

1)
5.5 km/s

2)
4.2 km/s

3)
5.2 km/s

4)
4.8 km/s

5)
3.7 km/s

Question 4

1 / 1 point
The period of oscillation of an object in a frictionless tunnel running through the Earth is 84.3 min. What is the period of oscillation of an object in a similar tunnel on the Moon? (RE = 6.37  106 m; RM = 1.74  106 m; ME = 5.98  1024 kg; MM = 7.36  1022 kg.)
Question options:

1)
6.03  103 min.

2)
0.713 min.

3)
84.3 min.

4)
108.5 min.

5)
139.6 min.

Question 5

1 / 1 point
What is the gravitational force on a 20-kg satellite circling the Earth (radius = 6.4  106 m, mass =