A transformer consists of a 780-turn primary coil and a 1 403-turn secondary coil. If the current in the secondary is 3.49 A, what is the primary current?
a. 1.94 A
b. 4.68 A
c. 6.28 A
d. 3.49 A
e. 2.60 A
c
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Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud
A) degeneracy pressure B) radiation pressure C) stellar winds D) thermal pressure
Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas
What is the smallest angle, reckoned north of east from midway between the antennas, at which destructive interference of the two radio waves occurs? (c = 3.00 × 108 m/s) A) 13° B) 6.4° C) 9.7° D) 16° E) 19°
If a nucleus decays by ?+ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus. B) The daughter nucleus has more neutrons than the original nucleus. C) The daughter nucleus has the same number of nucleons as the original nucleus. D) The daughter nucleus has fewer protons than the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. The velocity
a. is zero c. points up b. has its largest magnitude d. points down