Under what condition the law of conservation of momentum hold
Ans: For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision.
No external forse should be acting on the system such as gravity friction etc.
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The equator has approximately ______________ hours of daylight every day of the year
Fill in the blank(s) with correct word
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the electron at the position of the proton is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
What happens when a star exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming smaller and dimmer. C) It contracts, becoming hotter and brighter. D) It expands, becoming bigger but dimmer. E) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness.
Isolated, submarine, volcanic mountains are known as
a. reefs. b. atolls. c. seamounts. d. spits.