The helium flash is followed within a few million years by the Type II supernova
Indicate whether the statement is true or false
FALSE
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Total Internal Reflection: The speed of light in a material is 0.41 c. What is the critical angle of a light ray at the interface between the material and a vacuum?
A. 24° B. 17° C. 19° D. 22°
Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side
If one of the balls is released, what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2 ) A) 4.2 × 10-8 m/s2 B) 3.7 × 10-8 m/s2 C) 1.9 × 10-8 m/s2 D) 6.4 × 10-8 m/s2 E) 2.5 × 10-8 m/s2
A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg/m2/s) relative to the center of the race track?
a. 5.0 × 10^2 b. 5.0 × 10^6 c. 2.5 × 10^4 d. 2.5 × 10^6 e. 5.0 × 10^3
Consider two copper wires. One has twice the length and twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has four times the resistance of the shorter wire. C) The longer wire has twice the resistance of the shorter wire. D) The longer wire has eight times the resistance of the shorter wire. E) none of the given answers