The critical temperature below which superconductors conduct so superbly is affected by
1.chemical composition, pressure, and conductivity at normal temperatures.
2.chemical composition, molecular structure, and conductivity at normal temperatures.
3.chemical composition, pressure, and molecular structure.
4.pressure, molecular structure, and conductivity at normal temperatures.
3
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A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward direction. The projectile makes an angle of 30° with the direction of the plane's motion
What is the speed of the projectile with respect to a stationary observer on the ground? A) 293 m/s B) 243 m/s C) 268 m/s D) 250 m/s E) 281 m/s
In making a transition from state n = 1 to state n = 2, the hydrogen atom must
A) absorb a photon of energy 10.2 eV. B) emit a photon of energy 10.2 eV. C) absorb a photon of energy 13.58 eV. D) emit a photon of energy 13.58 eV.
Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?
a. microwave c. x-rays b. infrared d. ultraviolet
A 3,000 kg truck experiences a net force of 2,000 N. What is its acceleration?