Add and and express your answer in milligrams (mg) to the correct number of significant figures
A) 4.64 × 107 mg
B) 4.64 × 104 mg
C) 4.64 × 105 mg
D) 4.64 × 106 mg
A
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A photograph of the two-dimensional elastic collision of two particles shows a particle of mass m1 approaching a stationary particle of mass m2
As a result of their interaction, the incident particle moves away along a line that makes an angle of 30° with its original path, and the other particle moves away along a line that makes an angle of 30° to the other side of the original path of the incident particle. What is the ratio of the masses, m1/m2? A) 0.5 B) 1 C) 2 D) 3 E) 4
Is the "sports wave" that crowds perform at sports arenas really a "wave" as physicists define the term?
A) Yes, because a disturbance does move from one point to another without a corresponding transfer of matter, and this is what we mean by a "wave" in physics. B) Yes, because energy does move through the crowd from one point to another, and this is what we mean by a "wave" in physics. C) No, because there is no real physical connection between the different parts of the medium. D) No, because spectators have free will--that is, they are not really forced to stand up and participate. E) No, for both the reasons stated in answers C and D.
A projectile is launched vertically upward at 50 m/s. If air resistance does affect motion, then its speed upon returning to its starting point is
A) less than 50 m/s. B) 50 m/s. C) more than 50 m/s.
Some large clusters of galaxies do not appear to contain enough mass to hold themselves together
a. True b. False Indicate whether the statement is true or false