The resistance of a superconductor is infinite once it goes into the superconductivity state
Indicate whether the statement is true or false
FALSE
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An object is placed a distance y0 = ?2f in front of a concave mirror of focal length f that is located at y = 0 . An identical object is placed a distance y'0 = ?2f in front of a convex mirror of focal length ?f that is located at y' = 0 . The difference between the two image positions, yi ? y'i, is a. f /2
b. f. c. 4f /3. d. 2f. e. 8f /3.
The ecliptic can be defined as
a. the plane that is perpendicular to the Earth's axis of rotation. b. the projection of the Earth's equator onto the sky. c. the path traced out by the Moon in our sky in one month against the background stars. d. the path traced out by the Sun in our sky over one year against the background stars.
A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s. The two cars collide at the intersection and lock together
Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
Water with a density of 1,000 
flows through a 2.00 cm diameter pipe with a velocity of 2.40 m/s. What is the volume flow rate?
A. 
B. 
C. 
D. 
E. 