Spiderweb conductivity. Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey hygroscopic —that is. they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5 mm length of thread between two electrical contacts. The researchers stretched the thread in 1 mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1 mm increments. Some of the resistance measurements are given in the table: Resistance of thread (10 9 Ω) 9 19 41 63 102 76 50 24 Length of thread (mm) 5 7 9 11 13 9 7 5 84. What is the best explanation for the behavior exhibited in the data? A. Longer threads can carry more current than shorter threads and so make better electrical conductors. B. The thread stops being a conductor when it is stretched to 13 mm due to breaks that occur in the thin coating. C. As the thread is stretched, the coating thins and its resistance increases; as the thread is relaxed, the coating returns nearly to its original state. D. The resistance of the thread increases with distance from the end of the thread.
Spiderweb conductivity. Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey hygroscopic —that is. they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5 mm length of thread between two electrical contacts. The researchers stretched the thread in 1 mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1 mm increments. Some of the resistance measurements are given in the table: Resistance of thread (10 9 Ω) 9 19 41 63 102 76 50 24 Length of thread (mm) 5 7 9 11 13 9 7 5 84. What is the best explanation for the behavior exhibited in the data? A. Longer threads can carry more current than shorter threads and so make better electrical conductors. B. The thread stops being a conductor when it is stretched to 13 mm due to breaks that occur in the thin coating. C. As the thread is stretched, the coating thins and its resistance increases; as the thread is relaxed, the coating returns nearly to its original state. D. The resistance of the thread increases with distance from the end of the thread.
Spiderweb conductivity. Some types of spiders build webs that consist of threads made of dry silk coated with a solution of a variety of compounds. This coating leaves the threads, which are used to capture prey hygroscopic—that is. they attract water from the atmosphere. It has been hypothesized that this aqueous coating makes the threads good electrical conductors. To test the electrical properties of coated thread, researchers placed a 5 mm length of thread between two electrical contacts. The researchers stretched the thread in 1 mm increments to more than twice its original length, and then allowed it to return to its original length, again in 1 mm increments. Some of the resistance measurements are given in the table:
Resistance of thread (109 Ω)
9
19
41
63
102
76
50
24
Length of thread (mm)
5
7
9
11
13
9
7
5
84. What is the best explanation for the behavior exhibited in the data?
A. Longer threads can carry more current than shorter threads and so make better electrical conductors.
B. The thread stops being a conductor when it is stretched to 13 mm due to breaks that occur in the thin coating.
C. As the thread is stretched, the coating thins and its resistance increases; as the thread is relaxed, the coating returns nearly to its original state.
D. The resistance of the thread increases with distance from the end of the thread.
suggest a reason ultrasound cleaning is better than cleaning by hand?
Checkpoint 4
The figure shows four orientations of an electric di-
pole in an external electric field. Rank the orienta-
tions according to (a) the magnitude of the torque
on the dipole and (b) the potential energy of the di-
pole, greatest first.
(1)
(2)
E
(4)
What is integrated science.
What is fractional distillation
What is simple distillation
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