Why will girls wearing gym shoes win in a tug-of-war against boys wearing socks while the activity occurs on a smooth floor?
What will be an ideal response?
Answer: In any tug of war, the tension on both ends of the rope is the same, so the winning team is the one that exerts more force on the floor. Socks slip easily on a smooth floor, preventing the boys from pushing on and being pushed by the floor. Newton's third law!
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Bohr's quantum condition was
A) angular momentum is quantized. B) energy is exchanged when changing state. C) a photon is emitted as a quantum of energy D) electron orbits are stationary states. E) none of the above.
The Chandrasekhar limit tells us that
a. accretion disks can grow hot through friction. b. neutron stars of more than 3 solar masses are not stable. c. white dwarfs more massive than 1.4 solar masses are not stable. d. stars cannot travel through space too fast. e. stars with a mass less than 0.5 solar masses will not go through helium flash.
Uranus' moon Ariel shows considerable surface activity, a surprise considering its small size
Indicate whether the statement is true or false
In the Drake equation (Number of Civilizations = NHP × flife × fciv × fnow), we expect the term fciv to be small if
A) most civilizations destroy themselves within just a few hundred years of arising. B) most of the civilizations that have ever existed are still out and about in the galaxy. C) primitive life is common but intelligent life is rare. D) most habitable planets never actually get life on them.