A thin copper rod 1.00 m long has a mass of 50.0 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T?
1.1.20 A
2.2.40 A
3.4.90 A
4.9.80 A
5.none of those answers
3
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Ammonia, NH3, boils at a higher temperature than phosphine, PH3 . This is probably due to
a. ammonia being more dense than PH3. b. ammonia having the lower formula mass. c. hydrogen bonding among the NH3 molecules. d. ammonia being ionic and phosphine being covalent.
A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is long and open at both ends into its second overtone resonance
What is the distance between a node and an adjacent antinode, in the string? The speed of sound in air is 345 m/s. A) 7.5 mm B) 23 mm C) 150 mm D) 30 mm E) 15 mm
The bob of a conical pendulum swings in a
A) to-and-fro path. B) circular path. C) chaotic path.
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 11-1. What is the magnitude of their velocity, in m/s, immediately after the collision?
A. 0 B. 13 C. 15 D. 26 E. 30