Explanation:
A substance with a short , medium, free path has improved electron flow resistance and a higher electrical resistance . Heat applications impose more molecular chaos on all materials and shorten the track further, increasing resistance of most materials. So, just refresh the material to expand the course. In certain materials, when cooled to the minimum temperature, the conductivity is substantially increased.
Answer:
Một dây dẫn bằng nikelin dài 20m, tiết diện 0.5mm2 điện trở suất của nikelin là 0,4.10^-6 ôm/m. tính điện trở dây dẫn
Answer:
D. 200 kgm/s
Explanation:
Momentum is conserved.
Initial momentum = final momentum
(50 kg) (4 m/s) + (30 kg) (0 m/s) = final momentum
200 kgm/s = final momentum
Answer:
Distance(h1) = 12 m
Explanation:
Given
:
Height of cliff (h) = 4m
Time (t) = 1s
Intial velocity (u) = 0m/s
Computation:
Distance(h) = 1/2(g)(t)²
4 = 1/2(g)
g = 8m/s
²
Distance(h1) = 1/2(g)[(t1)²-(t)²]
Distance(h1) = 1/2(8)(3)
Distance(h1) = 12 m
