If the Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees, what are some of the implications, and why?
A) The seasons would be less extreme, because the Sun's rays would be less direct in summer, and more direct in winter.
B) The seasons would be more extreme, because the surface of the Earth would be closer to the Sun in the summer, and farther from the Sun in the winter.
C) The seasons would be less extreme, because the surface of the Earth would be farther from the Sun in the summer, and closer to the Sun in the winter.
D) The seasons would be more extreme, because the Sun's rays would be more direct in summer, and less direct in winter.
D
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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.
Can either normal or dark matter stop the universal expansion?
What will be an ideal response?
A standard unit
a. is the same in all systems of units. b. may not be fixed in value. c. is found only in the British system. d. is used for taking accurate measurements. e. is found only in the metric system.
Energy Conservation With Conservative Forces: A 5.0-N projectile leaves the ground with a kinetic energy of 220 J. At the highest point in its trajectory, its kinetic energy is 120 J. To what vertical height, relative to its launch point, did it rise if there was no air resistance?
A. 44 m B. 24 m C. 20 m D. 10 m E. It is impossible to determine the height without knowing the angle of launch.