The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?
A) 2 A
B) 8 A
C) 1/2 A
D) 1/4 A
E) 4 A
B
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The presence of _____ on the Moon implies that the craters on the Moon were formed by impacts
A) ejecta B) magma oceans C) the Maxwell Montes D) permafrost
What is the maximum length of a metal cable that can hang vertically supported from one end of the cable?
The Young's modulus of this metal is 2.10 × 1011 N/m2, its tensile strength (the maximum tensile stress it can support without breaking) is 7.40 × 108 N/m2, and its density is 7.60 × 103 kg/m3. A) 9.94 km B) 4.22 km C) 456 km D) 1.75 km E) 24.8 km
The synodic period of Venus is the time it takes for:
A) Venus to complete a full orbit around the Sun. B) Venus to complete a full rotation on its axis. C) Venus to complete a full cycle of phases. D) Earth to complete a full orbit around the Sun. E) Earth to go from opposition to conjunction, relative to Venus.
Scientists were led to postulate the existence of the neutrino in order to
A) maintain the conservation of energy and of momentum in beta decay. B) provide a mechanism for quark production. C) account for alpha decay. D) explain the intense radiation emitted by quasars.