Why would Earth's orbit be unaffected were the Sun to suddenly become a black hole (with no change in its mass)?
What will be an ideal response?
Earth's orbit (and those of the other planets) would remain unchanged since they are far enough away that Newton's law of gravity applies and the gravitational force depends only on the masses of the objects and the distance between them, not on their composition or density.
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What is the nearest huge cluster of galaxies to our Local Group?
A) Coma Cluster B) Centaurus Cluster C) Virgo Cluster D) Orion Nebula E) Hercules Cluster
How long after the Big Bang was the Planck time, the time at which our current theories become completely unable to describe conditions any earlier in the universe?
A) 380,000 years B) 10-35 seconds C) 10-10 seconds D) 10-43 seconds E) 3 minutes
When a 6-kg object increases its potential energy by 180 J, approximately how has its position changed?
a. It has risen vertically 3 m. b. It has fallen vertically 3 m. c. It has risen vertically 30 m. d. It has moved horizontally 30 m.
In the context of the transitions in a hydrogen atom, the Lyman series lies in the infrared region
Indicate whether the statement is true or false