What is the stored energy in a 0.50-mH coil carrying a current of 5.0 A?
a. 1.3E–2 J
b. 6.3E–3 J
c. 2.5E–3 J
d. 2.5E–2 J
e. 1.0E–2 J
b
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A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm
What is the area of this wire? A) 0.20 m2 B) 0.40 m2 C) 0.26 m2 D) 0.80 m2 E) 0.53 m2
At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?
A) by using radio telescopes to search for signals from extraterrestrial civilizations B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally C) by searching for planets around distant stars D) by using x-ray telescopes to search for exhaust from interstellar spacecraft E) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada
The lines in the visible region of the hydrogen spectrum arise from transitions from higher levels back to the level where n equals
a. 3. b. 1. c. 2. d. 4.
Inelastic Collisions: A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses just after the collision?
A. 10 m/s B. 2.5 m/s C. 2.0 m/s D. 0 m/s, since the collision is inelastic