If an AC circuit consists of a 220 mH inductor in series with a 75 k
resistor and an AC generator with rms voltage of 12 V. If the frequency of the generator is 25 kHz, what is the rms voltage drop across the resistor?
A. 7.0 V
B. 9.4 V
C. 2.6 V
D. 5.0 V
A. 7.0 V
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When a bimetallic strip is cooled, the strip will bend toward the side
A) with the larger coefficient of linear expansion. B) with the smaller coefficient of linear expansion. C) with the higher temperature. D) with the lower temperature. E) depends of the method of heating
You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a. 0. b. mgr. c. 2mgr. d. a function of the angular velocity. e. small at first, then increasing as the Frisbee loses the torque given it by your hand.
Can an object have increasing speed while its acceleration is decreasing? Support your answer with an example
A) No, this is impossible because of the way in which acceleration is defined. B) No, because if acceleration is decreasing the object will be slowing down. C) Yes, and an example would be an object falling in the absence of air friction. D) Yes, and an example would be an object rising in the absence of air friction. E) Yes, and an example would be an object released from rest in the presence of air friction.
Suggest why people once washed their hands with ashes
A) The ashes act as a base and reacts with skin oils to produce solutions of soap. B) The ashes act as an acid and reacts with the skin oils to produce soap. C) The oils on the skin act as a base and reacts with the ashes to produce soap. D) After being burnt in the fire, the acids and bases of the log are neutralized, making it a gentle material to use on the hands.