Why isn't the space within our solar system or the Milky Way expanding according to Hubble's law?
A) Hubble's law only applied early in the history of the universe.
B) As we are inside our solar system and the Milky Way, we cannot observe their expansion.
C) The universe is not old enough for the solar system or Milky Way to have begun their expansion.
D) The gravity exerted by the solar system and the Milky Way is strong enough to hold them together against the expansion of the universe.
D) The gravity exerted by the solar system and the Milky Way is strong enough to hold them together against the expansion of the universe.
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An automobile traveling along a straight road increases its speed from 30.0 m/s to 50.0 m/s in a distance of 180 m. If the acceleration is constant, how much time elapses while the auto moves this distance?
a. 6.00 s b. 4.50 s c. 3.60 s d. 4.00 s e. 9.00 s
If a force on an object is aimed opposite the direction of the object's velocity, the force does
a. no work c. negative work b. positive work d. any of the above
What is the Sun's approximate composition (by mass)?
A) 70% hydrogen, 28% helium, 2% other elements B) 100% hydrogen and helium C) 50% hydrogen, 25% helium, 25% other elements D) 90% dark matter, 10% ordinary matter
An arrow of mass 20. g is shot horizontally into a bale of hay, striking the hay with a constant velocity of 60. m/s. It penetrates a depth of 20. cm before stopping. What is the average stopping force acting on the arrow?
What will be an ideal response?