By what factor is the self-inductance of an air solenoid changed if only its number of coil turns, N, is multiplied by five?
a. 1/5
b. 5
c. 15
d. 25
e. 1/25
d
Physics & Space Science
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A 22-W platinum wire at 20°C with a temperature coefficient of resistivity of 3.9 × 10^-3 (°C)-1 will have what resistance at 100°C?
a. 29 W c. 26 W b. 20 W d. 14 W
Physics & Space Science
The lowest frequency visible light is
a. violet b. red c. blue d. green e. yellow
Physics & Space Science
All four jovian planets are oblate, with larger polar than equatorial diameters
Indicate whether the statement is true or false
Physics & Space Science
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5.0 km if we neglect the earth's rotational effects? (The mean radius of the Earth is 6.38 × 106 m, G = 6.67 × 10-11 N ? m2/kg2.)
A) -0.60 N B) -1.5 N C) -2.6 N D) -3.6 N E) -5.2 N
Physics & Space Science