Accretion is
a. the adding of material to an object an atom or molecule at a time.
b. the adding of material to an object by collection of solid particles.
c. the release of gas from rocks as they are heated.
d. the largest of the Galilean satellites.
e. caused by the bombardment of the solar wind.
b
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The heater element of a particular 120-V toaster is a 8.9-m length of nichrome wire, whose diameter is 0.86 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m
If the toaster is operated at a voltage of 120 V, how much power does it draw? A) 720 W B) 700 W C) 750 W D) 770 W E) 800 W
The coil in a 60-Hz ac generator has 125 turns, each having an area of 3.0 × 10-2 m2 and is rotated in a uniform 0.12-T magnetic field. What is the peak output voltage of this generator?
A) 170 V B) 120 V C) 200 V D) 110 V E) 220 V
Power: Rita raises a 10kg package to a height of 2.5 m in 2.0 s.(a) How much work did she do on the package?(b) How much power was expended on the package?(c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?
J. J. Thomson
A) proposed the tiny central nucleus idea. B) discovered radium and polonium. C) observed back-scattering from nuclei. D) proposed the plum-pudding model. E) invented the particle detector tube.