The symbol for the element that is the major component of steel is ______________
Fill in the blank(s) with correct word
Fe
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When water at 4°C is heated, it expands. When water at 4°C is cooled, it
1) contracts, 2) expands, 3) neither contracts nor expands, 4) not enough information given, which follows from the fact that 5) cooling decreases the kinetic energy of H2O molecules. 6) water has its greatest density at 4°C. 7) we do not know how the water is cooled.
The coefficient of linear expansion for aluminum is 24. × 10-6K-1. What is the coefficient in units of C°-1?
What will be an ideal response?
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.
Jupiter completes one revolution about its own axis every 9.92 hours. What is the radius of the orbit required for a satellite to revolve about Jupiter with the same period? Jupiter has a mass of 1.90 × 1027 kg and G = 6.67 × 10-11 N ? m2/kg2
A) 1.04 × 107 m B) 2.26 × 109 m C) 1.60 × 108 m D) 3.41 × 108 m E) 7.45 × 108 m