A long straight wire (diameter = 2.0 mm) carries a current of 40 A. What is the magnitude of the magnetic field 1.5 mm from the axis of the wire?
a. 3.0 mT
b. 12 mT
c. 5.3 mT
d. 7.4 mT
e. 8.0 mT
C
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A "double satellite" is launched into space. It consists of a satellite of mass m and another satellite of mass 5m. The connecting mechanism of these satellites is an explosive bolt and a compressed spring, both of negligible mass. The bolt is exploded and the satellites drift apart having been pushed by the spring. When the less massive satellite has moved a distance of 2.5 m from the center of
mass of the double satellite, how far away from it is the satellite of greater mass? a. 3.0 m c. 0.10 m b. 12 m d. 0.50 m
Opacity is
a. the balance between the pressure and force of gravity inside a star. b. the force that binds protons and neutrons together to form a nucleus. c. the force that binds an electron to the nucleus in an atom. d. a measure of the resistance to the flow of radiation (photons) through a gas. e. the temperature and density at which a gas will undergo thermonuclear fusion.
Vector V1 is (5i + 7j - 3k) and V2 = (7i + 2 j + 14k). The scalar product of these two vectors is:
(A) 7.0 (B) -5.8 (C) 2.5 (D) 3.4
Material that falls into a black hole can be seen by the electromagnetic radiation it emits before it reaches the event horizon
Indicate whether the statement is true or false