The sunspot cycle is sometimes described as lasting 11 years, but others prefer to consider it as 22 years; explain the rationale
What will be an ideal response?
The numbers of sunspots come to a peak about every 11 years, but with the beginning of the next cycle, the polarities of the spot pairs reverse, so it takes 22 years to go through the magnetic polarity cycle.
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A spring-powered dart gun is un-stretched and has a spring constant 10.0 N/m. The spring is compressed by 8.00 cm and a 5.00 gram projectile is placed in the gun. The kinetic energy of the projectile when it is shot from the gun is
A. 0.020 J. B. 0.032 J. C. 0.060 J. D. 0.100 J. E. 0.120 J.
If you change the magnetic field inside a closed loop of wire, you induce in the loop
A. all of these B. a current C. a voltage D. an electric field
A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands
If of thermal energy is transferred through heating to the system and it - of work is done on it, how much does the internal (thermal) energy of the fluid change? A) 4.0 kJ B) 14 kJ C) -4.0 kJ D) 45 kJ
What precision should you expect for a quantity that you determine by estimation in which variables used in the calculation are rounded to the nearest power of ten?
A) Two significant figures will always be correct. B) the correct order of magnitude C) Anywhere from two to three significant figures will always be correct. D) One significant figure will always be correct. E) Three significant figures will always be correct.