Answer:
Explanation:
Given
average speed of Phelps
total distance
he swims first 100 m at an average speed if
so time taken is
suppose is the time taken to swim remaining half
average velocity is
so velocity in the second half is
Answer:
In metals there are free electrons at normal temperature so when we increase temperature it resistivity gets increases,so conductivity decreases,while in semiconductor the electrons are not free so when we increase the temperature the covalent bonds begin to break and the electron becomes free so conductivity get.
Explanation:
Answer:
The answer is in my picture.
Explanation:
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Explanation:
Given
Ball is projected horizontally from a building of height
time taken to reach ground is given by
(b) Line joining the point of projection and the point where it hits the ground makes an angle of
From the figure, it can be written
Considering horizontal motion
(c) The vertical velocity with which it strikes the ground is given by
Thus, the ball strikes with a vertical velocity of
They are listed in order of increasing atomic numbers