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Answer:
B. Objects do not have to touch each other to experience a force.
Explanation:
For example ..One of the noncontact forces is magnetic force whereby a magnetic object will be attracted to another magnetic object of oppsite charged particles, through waves called electromagnetic waves. On the other hand, the two magnetic objects of similar charged particles can repel through electromagnetic waves..
Answer:
Angular displacement before it stops = 18 rev
Explanation:
Given:
Speed of fan w(i) = 6 rev/s
Speed of fan (Slow) ∝ = 1 rev/s
Final speed of fan w(f) = 0 rev/s
Find:
Angular displacement before it stops
Computation:
w(f)² = w(i) + 2∝θ
0² = 6² + 2(1)θ
0 = 36 + 2θ
2θ = -36
Angular displacement before it stops = -36 / 2
θ = -18
Angular displacement before it stops = 18 rev
Answer:
Yes
Explanation:
Element D will also burn in oxygen, because elements classified under same group has similar physical or chemical properties.
Answer:
the natural length of the spring is 9 cm
Explanation:
let the natural length of the spring = L
For each of the work done, we set up an integral equation;
![5.4 = \int\limits^{21-l}_{15-l} {kx} \, dx \\\\5.4 = [\frac{1}{2}kx^2 ]^{21-l}_{15-l}\\\\5.4 = \frac{k}{2} [(21-l)^2 - (15-l)^2]\\\\k = \frac{2(5.4)}{(21-l)^2 - (15-l)^2} \ \ \ -----(1)](https://tex.z-dn.net/?f=5.4%20%3D%20%5Cint%5Climits%5E%7B21-l%7D_%7B15-l%7D%20%7Bkx%7D%20%5C%2C%20dx%20%5C%5C%5C%5C5.4%20%3D%20%5B%5Cfrac%7B1%7D%7B2%7Dkx%5E2%20%5D%5E%7B21-l%7D_%7B15-l%7D%5C%5C%5C%5C5.4%20%3D%20%5Cfrac%7Bk%7D%7B2%7D%20%5B%2821-l%29%5E2%20-%20%2815-l%29%5E2%5D%5C%5C%5C%5Ck%20%3D%20%5Cfrac%7B2%285.4%29%7D%7B%2821-l%29%5E2%20-%20%2815-l%29%5E2%7D%20%20%5C%20%5C%20%5C%20-----%281%29)
The second equation of work done is set up as follows;
![9 = \int\limits^{27-l}_{21-l} {kx} \, dx \\\\9 = [\frac{1}{2}kx^2 ]^{27-l}_{21-l}\\\\9 = \frac{k}{2} [(27-l)^2 - (21-l)^2] \\\\k = \frac{2(9)}{(27-l)^2 - (21-l)^2} \ \ \ -----(2)](https://tex.z-dn.net/?f=9%20%3D%20%5Cint%5Climits%5E%7B27-l%7D_%7B21-l%7D%20%7Bkx%7D%20%5C%2C%20dx%20%5C%5C%5C%5C9%20%3D%20%5B%5Cfrac%7B1%7D%7B2%7Dkx%5E2%20%5D%5E%7B27-l%7D_%7B21-l%7D%5C%5C%5C%5C9%20%3D%20%5Cfrac%7Bk%7D%7B2%7D%20%5B%2827-l%29%5E2%20-%20%2821-l%29%5E2%5D%20%5C%5C%5C%5Ck%20%3D%20%5Cfrac%7B2%289%29%7D%7B%2827-l%29%5E2%20-%20%2821-l%29%5E2%7D%20%5C%20%5C%20%5C%20-----%282%29)
solve equation (1) and equation (2) together;
Therefore, the natural length of the spring is 9 cm
