What do we mean by time dilation in relativity?
A) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone.
B) It is the idea that relativity makes time dilate, or expand, for people who study it.
C) It is a hallucinogenic effect experienced by people who take too much of something.
D) It is the idea that time really runs slower in reference frames moving relative to you.
D
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A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. In what direction does the wreckage move just after the collision?
A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E
In nuclear fusion, energy is produced because:
a) Hydrogen is not stable. b) the mass of the reacting chemicals is larger than that of the products. c) of the energetic impact of collisions. d) gravity leads to collapse. e) positrons are produced.
The ratio of the number of protons to neutrons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?
a. decreases with greater atomic number b. increases with greater atomic number c. remains constant for entire range of atomic numbers d. is maximum for atomic number = 60
What is h?
What will be an ideal response?