What quantity is the same for three resistors in a parallel circuit?
a. power b. resistance c. voltage across them d. current
c
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Carnot Engine: An inventor tries to sell you his new heat engine that takes in 40 J of heat at 87°C on each cycle, expels 30 J at 27°C, and does 10 J of work. Would it be wise to invest in this engine? Back up your conclusion with numerical calculations.
What will be an ideal response?
In a demonstration, a 4.00 cm2 square coil with 10,000 turns enters a larger square region with a uniform 1.50-T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
A. 7.5 × 10?3 cm. B. 0.015 cm. C. 7.5 cm. D. 13 cm. E. 15 cm.
Of the four gases CO2, H2O, N2, and O2, which are greenhouse gases?
A) Only CO2 B) CO2 and H2O C) CO2 and N2 D) all except O2 E) all four
By how many newtons does the weight of a 100-kg person change when he goes from sea level to an altitude of 5.0 km if we neglect the earth's rotational effects? (The mean radius of the Earth is 6.38 × 106 m, G = 6.67 × 10-11 N • m2/kg2.)
A) -0.60 N B) -1.5 N C) -2.6 N D) -3.6 N E) -5.2 N