A particle is moving the +x direction at speed c/2 . Another particle is moving in the –x direction at speed c/2 toward the first particle. Which of the following best describes the speed of one particle as seen by an observer moving with the other particle?
a. c b. some value less than 3c/4
c. some value more than 3c/4 d. 3c/4
c
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If you saw the label "phenylephrine HCl" on a decongestant, would you worry that consuming it would expose you to the strong acid hydrochloric acid, HCl?
A) No, because it is balanced by the phenylephrine. B) No, because the drug is in the solid phase. C) No, because this is a salt made using hydrogen chloride, but it is in no way hydrogen chloride. D) Yes, because of the hydrochloric acid it contains.
A fancy sports car passes Big Ben at a speed of 0.600c. What time interval will the driver measure for a one-second interval on the large clock?
A. 1.67 s B. 0.800 s C. 1.25 s D. 0.600 s E. 1.00 s
Protostars are observable by radio telescopes but hard to detect in visible light because they have ________ and are ________.
A. low surface temperature; very distant B. small size; very distant C. low surface temperature; surrounded by dust D. small size; very hot
A proton moving at a speed of 3.8 × 10^6 m/s cuts across the lines of a magnetic field at an angle of 40°. The strength of the field is 0.25 × 10^-4 T. What is the magnitude of the force acting on the proton? (qp = 1.6 × 10^-19 C)
a. 1.4 × 10^-17 N c. 9.8 × 10^-18 N b. 2.3 × 10^-17 N d. 5.1 × 10^-18 N