Why do flat disks form around young stars?
A) They don't; the stars form from the disks.
B) Centrifugal force pushes gas outward from the spinning gas cloud.
C) Intense winds from nearby massive stars flatten the gas cloud.
D) Collisions between rotating gas particles flatten the gas cloud along the axis of rotation.
D
You might also like to view...
The magnitude of the total negative charge on the electrons in 1 mol of helium (atomic number 2, atomic mass 4) is:
A) 4.8 × 104 C B) 9.6 × 104 C C) 1.9 × 105 C D) 3.8 × 105 C E) 7.7 × 105 C
A lens of focal length 1500 mm is used to project an in image of the sun. If the sun subtends an angle of 
what is the diameter of the image?
A. 60 mm B. 30 mm C. 26 mm D. 6.5 mm E. 13 mm
A car starts from rest and travels a distance of 100 m in 10 seconds. The acceleration of the car is
A. 1.0 
B. 2.0
C. 2.5
D. 3.0
E. 3.5
State Newton's third law of motion
What will be an ideal response?