Velma passes Mort at a speed of 0.75c. At this speed, the "time dilation factor" is 1.5. In other words, Mort observes a 1-second tick of Velma's clock to take 1.5 seconds
Suppose that they are born at the same time, and that Velma observes herself to live 30 years. According to Mort's observations, how old is he when Velma dies?
A) 10 years B) 30 years C) 20 years D) 40 years E) 45 years
E
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Wien's Law: If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K.
Fill in the blank(s) with the appropriate word(s).
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
A. (?3, ?1) m B. (+1, +3) m C. (+3, ?1) m D. (?1, ?3) m E. (?0.5, ?2) m
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20)
This fact relates to the organization of the periodic table in that strontium and calcium are both A) metals. B) in group 2 of the periodic table. C) made of relatively large atoms. D) soluble in water.
In a two-slit experiment, the third bright fringe away from the central fringe is observed at an angle of 7.0°. If the wavelength of the light is 490 nm, what is the distance between the two slits?
A) 3.6 × 10-5 m B) 4.0 × 10-6 m C) 2.1 × 10-6 m D) 2.1 × 10-5 m E) 1.2 × 10-5 m