A very dense 1500-kg point object (
A) and a dense 1200-kg point object (B) are held in place 1.00 m apart on a frictionless table. A third point object is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third object is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
1.8 × 10-6 m/s2, toward B
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The amount that light of a distant galaxy is bent by the gravity of a nearby cluster of galaxies
A: allows us to measure the mass of the cluster. B: proves that dark matter does not exist in clusters. C: allows us to measure the mass of the galaxy.
The two great theories of 20th-century physics are quantum theory and
A) the theory of relativity. B) thermodynamics. C) Hamiltonian mechanics. D) the bootstrap theory of elementary particles. E) electromagnetism.
Polaris is a second magnitude star, and Phi Pegasi is about 16 times fainter than Polaris. What is the approximate magnitude of Phi Pegasi?
a. 18 b. ?14 c. 3 d. ?3 e. 5
Is the cosmological redshift really a velocity of a given galaxy?
What will be an ideal response?