Which of the following statements about the sunspot cycle is not true?
A) The number of sunspots peaks approximately every 11 years.
B) With each subsequent peak in the number of sunspots, the magnetic polarity of the Sun is the reverse of the previous peak.
C) The rate of nuclear fusion in the Sun peaks about every 11 years.
D) The cycle is truly a cycle of magnetic activity, and variations in the number of sunspots are only one manifestation of the cycle.
E) The number of solar flares peaks about every 11 years.
C) The rate of nuclear fusion in the Sun peaks about every 11 years.
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Nanoparticles are finding many applications including medicine, magnetic permanent memory, and high strength materials. Assume that a high strength nickel alloy is to be made out of nanoparticles, and that the size of the nanoparticles is a cube 10 nm on each side. Calculate the number of atoms in these particles in two ways.
(a) For face centered cubic nickel calculate the number of atoms using only the lattice parameter of 0.352 nm from Appendix B and (b) using the density of nickel and the atomic mass from Appendix B.
The Sun's declination on June 21st is
A) +23.5 degrees. B) 0 degrees. C) -23.5 degrees. D) different depending on where you are on Earth.
A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
A. 51 ?T B. 61 ?T C. 43 ?T D. 81 ?T E. 1.4 ?T
Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision. Car B has a mass of 1600 kg
The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision, assuming that any other unbalanced forces are negligible? A) 16 m/s B) 18 m/s C) 11 m/s D) 21 m/s E) 14 m/s