The scalar product is not distributive
Indicate whether the statement is true or false
FALSE
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Careful observations of the sky by ancient cultures served the practical purpose of
A) keeping track of time B) improving night vision C) religious worship D) keeping track of the changing position of the Earth around the Sun
The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB
You wake up one morning to find that four of your neighbors are all mowing their lawns using identical "Super-Silent" mowers. When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 80 dB B) 104 dB C) 400 dB D) 50 dB E) 40 dB
Two insulated current-carrying straight wires of equal length are arranged in the lab so that Wire A carries a current northward and Wire B carries a current eastward, the wires crossing at their midpoints separated only by their insulation. Which of the following statements are true?
a. The net force on Wire B is southward. b. The net force on Wire A is westward. c. There are no forces in this situation. d. There are forces, but the net force on each wire is zero.
A circuit contains two inductors of 6.0 mH inductance in parallel placed in series with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
a. 3.0 mH b. 3.4 mH c. 4.8 mH d. 11 mH e. 20 mH