When the principal quantum number is n = 5, how many different values of ? are possible?
1.1
2.5
3.9
4.25
2
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Magnetic Field of a Long Wire: In the figure, the two long straight wires are separated by a distance of d = 0.40 m. The currents are I1 = 1.0 A to the right in the upper wire and I2 = 8.0 A to the left in the lower wire. What are the magnitude and direction of the magnetic field at point P, that is a distance d/2 = 0.20 m below the lower wire? (?0 = 4? × 10-7 T ? m/A)
What will be an ideal response?
A 12000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? For purposes of this problem, neglect the weight of the pistons. A) 0.954 kN B) 1.88 kN C) 1.96 kN D) 3.67 kN E) 1.20 kN
If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from
to 
From the first law, calculate the change of internal energy of the gas in this process.
A. 312 J B. 291 J C. 365 J D. 155 J
A very large sheet of a conductor carries a uniform charge density of 4.00 pC/mm2 on its surfaces. What is the electric field strength 3.00 mm outside the surface of the conductor? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 4.52 × 105 N/C B) 2.26 × 105 N/C C) 9.04 × 105 N/C D) 0.452 N/C E) 0.226 N/C