Stable fusion reactions end when ________ builds in a high-mass star's core
Fill in the blank(s) with correct word
iron
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A set of data points is plotted in the graph at right. Which points should be used to find the slope of the line?
A. The blue circles. B. The red X’s. C. The green triangles.
A particle moving along the x axis has a position given by x = 54t? 2.0t3 m. At the time t = 3.0 s, the speed of the particle is zero. Which statement is correct?
A. The particle remains at rest after t = 3.0 s. B. The particle no longer accelerates after t = 3.0 s. C. The particle can be found at positions x< 0 m only when t< 0 s. D. All of the above are correct. E. None of the above is correct.
The symbol indicating the mass number of a nucleus is __________
Fill in the blank(s) with correct word
A 406.0 kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K
How much heat must the smelter produce to completely melt the copper bar? (The specific heat for copper is 386 J/kg•K, the heat of fusion for copper is 205 kJ/kg, and its melting point is 1357 K.) A) 1.66 × 1011 kJ B) 2.96 × 105 kJ C) 2.49 × 105 kJ D) 1.66 × 108 kJ