Based on the above graph, which statement about the sunspot cycle is true?
A) The period of the cycle is always exactly 11 years.
B) Some solar minima (when the Sun has the fewest sunspots) have significantly fewer sunspots than others.
C) Some solar maxima (when the Sun has the most sunspots) have significantly more sunspots than others.
D) At least 1% of the Sun's surface is covered with sunspots at all times.
C) Some solar maxima (when the Sun has the most sunspots) have significantly more sunspots than others.
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Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other
The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m ? K), and that of copper is 395 W/(m ? K). No heat is exchanged between the rods and the surroundings, except at their ends. A) 20 kJ B) 39 kJ C) 47 kJ D) 49 kJ E) 11 kJ
Mass on a Spring: An object of mass m = 8.0 kg is attached to an ideal spring and allowed to hang in the earth's gravitational field. The spring stretches 2.2 cm before it reaches its equilibrium position. If it were now allowed to oscillate by this spring, what would be its frequency?
A. 3.4 Hz B. 0.28 × 10-3 Hz C. 0.52 Hz D. 1.6 Hz
The astronaut whose heart rate on Earth is 63 beats/min increases his velocity to v = 0.70c. Now what is his heart rate as measured by an Earth observer?
a. 45 beats/min b. 88 beats/min c. 19 beats/min d. 90 beats/min e. 210 beats/min
Write the node equations for the model of heat transfer through the compressor housing section shown in Figure 2-66. Then solve for the node temperatures by using EES, Mathcad, or MATLAB.
