The speed of light is a relativistically invariant quantity
a. True
b. False
Indicate whether the statement is true or false
True
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A thermos bottle works well because:
A. its glass walls are thin B. silvering reduces convection C. vacuum reduces heat radiation D. silver coating is a poor heat conductor E. none of the above
Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum
A) is exactly 2 m. B) could be as small as 2 m, or as large as 12 m. C) is exactly 12 m. D) is larger than 12 m. E) is exactly 6 m.
Physically, the type of energy represented by the water behind a dam is
A) kinetic. B) thermal. C) chemical. D) electromagnetic. E) gravitational.
A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth
If we ignore atmospheric friction, with what speed does the object strike the surface of the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, the polar radius of the earth is 6357 km) A) 2.2 km/s B) 4.5 km/s C) 2.7 km/s D) 4.8 km/s E) 3.2 km/s