How does gravitational lensing let us find massive dark objects?
What will be an ideal response?
When a black hole or brown dwarf passes between us and a bright star, the gravity of the dark object can bend and focus the light of the distant star, making it brighten temporarily. The more massive the unseen object, the longer this brightening will last.
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Two equal mass balls (one blue and the other gold) are dropped from the same height, and rebound off the floor. The blue ball rebounds to a higher position
Which ball is subjected to the greater magnitude impulse during its collision with the floor? A) the gold ball B) Both balls were subjected to the same magnitude impulse. C) It's impossible to tell since the time intervals and forces are unknown. D) the blue ball
A glass of milk sits on a table. What forces act on the glass of milk?
What will be an ideal response?
Suppose a particle’s four-momentum vector has components [pt, px, py, pz] = [5 kg, 3 kg, 0, 0]. What is this particle’s mass?
A. 5 kg
B. 8 kg
C. 4 kg
D. 3 kg
E. 
kg
F. Other (specify)
Light not only has wavelike properties, but also has particle-like properties. What are these "particles" of light called?
a. quarks b. wavicles c. photons d. etherons