Four long wires are perpendicular to the x-y plane. Each wire carries the same magnitude current. Wire 1 goes through point (a, a, 0) on the x-y plane, wire 2 goes through the point (–a, a, 0), wire 3 goes through the point (–a, –a, 0), and wire 4 goes through the point (a, –a, 0). Wires 1 and 2 carry their currents in the positive z direction and wires 3 and 4 carry their currents in the
–z direction. What is the direction of the resulting magnetic field at the origin?
a. the –x direction
b. the –y direction
c. the +x direction
d. There is no direction since the field is zero at this position.
c
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The four fundamental forces in the Universe are the ___ forces
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Two white dwarf stars are the same size, but one has a surface temperature twice as hot as the other. The hotter star will radiate
a. half as much energy per second as the cooler star. b. the same amount of energy per second as the cooler star. c. four times as much energy per second as the cooler star. d. sixteen times as much energy per second as the cooler star.
How do radio interferometers greatly enhance resolution in radio wavelengths?
What will be an ideal response?
Rotational Kinetic Energy: A solid ball of mass 1.0 kg and radius 10 cm rolls with a forward speed of 10 m/s when it comes to a hill. There is enough friction on the hill to keep the ball from slipping as it rolls up.(a) How high vertically up the hill can the ball roll before coming to rest?(b) How high vertically could the ball go if the hill were totally frictionless?(c) How is it that the ball can go higher with friction than without friction?
What will be an ideal response?