The Lyman-alpha "forest" are absorption lines in a quasar spectrum created by all of the gases along the billions of light years its energy has traversed
Indicate whether the statement is true or false
TRUE
You might also like to view...
A force of 200 N is applied to a 50-kg mass in the direction of motion for a distance of 6.0 m, and then the force is increased to 300 N for the next 5.0 m. For the 11 m of travel, how much work is done by the varying force?
a. 2700 J b. 1500 J c. 2400 J d. -1200 J
What does the law of conservation of momentum tell us about collisions?
a. Collisions increase the momenta of the colliding objects because the impacts add momentum. b. Collisions decrease the momenta of the colliding objects because the friction of the impact decreases momentum. c. The total momentum in the system does not change because of a collision. d. The total momentum in the system goes to zero at the time of the collision. e. The momentum of each colliding object goes to zero upon collision.
I am stationary in a reference system but if my reference system is not an inertial reference system, then, relative to me, a system that is an inertial reference system must
a. remain at rest. b. move with constant velocity. c. be accelerating. d. be none of the above.
A 2.00 kg pendulum bob on a string 1.50 m long, is released with a velocity of 2.00 m/s when the support string makes an angle of 30.0 degrees with the vertical. What is the velocity of the bob at the bottom of the swing?
A. 4.32 
B. 4.00
C. 3.75
D. 3.04
E. 2.81