An object is placed at a distance of 41.4 cm from a thin lens along the axis. If a real image forms at a distance of 36.1 cm from the lens, on the opposite side from the object, what is the focal length of the lens?
a. 19.3 cm
b. 38.8 cm
c. 10.6 cm
d. 282 cm
e. 6.21 cm
a
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Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force that acts on the charge at the origin? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc/Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc/Vh of the volumes of the ideal gas. c. the ratio Pc/Ph of the pressures of the ideal gas. d. the ratio PcVc/PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.
Research
What will be an ideal response?
Which one of the following parameters is not used to determine the magnetic force on a current-carrying wire in a magnetic field?
a) length of the wire b) radius of the wire c) direction of the magnetic field with respect to the direction of the current d) the strength of the magnetic field e) the magnitude of the electric current