The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
A) 6 ohms.
B) 12 ohms.
C) 18 ohms.
D) none of the above
Answer: B
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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.
In addition to their usefulness in understanding physics, electromagnetic fields have an significant philosophical implication. What is this implication?
A) They support the materialism of Newtonian physics. B) The laws of electromagnetic fields imply that atoms are not real. C) The laws of electromagnetic fields imply that atoms are real. D) They represent a departure from the materialism of Newtonian physics. E) They change our basic notions of what "time" and "space" mean.
The period of an oscillating weight on a spring in an inertial frame of reference is 2.5 s. What would be its speed if it were to move by an observer who measures its period as 3.4 s? (c = 3.00 × 10^8 m/s)
a. 1.5 × l08 m/s b. 2.0 × 10^8 m/s c. 2.8 × l08 m/s d. 6.8 × 10^7 m/s e. 1.3 × 10^8 m/s
A mirror has a focal length -20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?
A. 20 cm in front of the mirror B. 20 cm behind the mirror C. 6.7 in from of the mirror D. 6.7 behind the mirror E. no image will form