If the magnitude difference between one star and another is 7, the stars differ in brightness by a factor of
a. 2.51.
b. 18.
c. 6.
d. 628.
d
Physics & Space Science
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Newton's Second Law in 1 Dimension: If a net force accelerates a 4.5-kg tool at 40 m/s2, what acceleration would that same net force give to an 18-kg tool?
A. 180 m/s2 B. 10 m/s2 C. 160 m/s2 D. 9.8 m/s2 E. 32 m/s2
Physics & Space Science
If you move a clock from Earth to the Moon, the clock runs
A) slower. B) no differently. C) faster.
Physics & Space Science
A child has a temperature of 104°F. What is the temperature in degrees kelvin?
a. 40 b. 406 c. 401 d. 313 e. 349
Physics & Space Science
A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. zero c. 2.0 × 10^-5 T b. 1.6 × 10^-5 T d. 4.0 × 10^-5 T
Physics & Space Science