Hubble found a direct relation between a galaxy's velocity and distance
Indicate whether the statement is true or false
TRUE
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To which of the following two-object systems can we apply conservation of momentum, and why? In each case, answer “A” if we can apply conservation of momentum because the system floats in space, “F” if it’s because the system is functionally isolated, “C” if it’s because the system undergoes a collision, and “D” if momentum is not conserved at all because the system is not isolated.
(a) Two magnetic hockey pucks slide on a flat plane of frictionless ice. They attract each other as they pass, changing each other’s trajectories without touching. (b) An asteroid imbeds itself in a planet. (c) An isolated star passes through a well-defined cloud of gas, and is slowed by friction in this process. (Assume that we can keep track of the cloud’s momentum.) (d) Two people dance the tango. (e) Two people riding personal hovercraft tug on each other with a rope. (f) A cannonball drops to the earth and lands with a thud, burying itself in the ground.
Suppose the x-position of an oscillating object is given by 
. What is the object’s speed at time t = 0?
A. A
B. Zero
C. 
D. 
E. 
F. Something else (specify)
T. We are not given enough information to answer.
On a Hertzsprung-Russell diagram, where would we find stars that have the largest radii?
A) upper right B) lower right C) upper left D) lower left
The acceleration of a ball as it rolls down a ramp is 3 m/s2 . It starts from rest. (a) What is the ball's speed after 4 seconds? (b) How far does the ball travel during the 4 seconds?