Our Sun and its planets were formed about _____
A) 2.2 billion years ago
B) 4.6 billion years ago
C) 5.2 billion years ago
D) 6.1 billion years ago
B
You might also like to view...
In our Solar System, an object is called a planet if
A. it has cleared its neighborhood. B. it is spherical. C. it orbits the Sun. D. All of these choices are correct.
According to Kepler, the speed of a planet is slowest when it is
A) closest to the Sun. B) farthest from the Sun. C) neither, for speed is a constant.
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound in the air is 340 m/s, the distance of the cliff from you is
a. 85 m. b. 170 m. c. 340 m. d. 680 m. e. none of the above.
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N × m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA