A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30° from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s−1 ) will be (g=10ms−2)
a. |
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b. |
|
c. |
|
d. |
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A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30° from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s−1 ) will be (g=10ms−2)
a. |
|
b. |
|
c. |
|
d. |
|
Work done by gravity from initial to final position is,
W=mg
=
According to work energy theorem
W=
=
=
rad/sec
∴ correct answer is (a)
If the height of a triangle is decreased by 40% and its base is increased by 40%, what will be the effect on its area? |
|||||||
(a) |
No change |
(b) |
8% decrease |
(c) |
16% decrease |
(d) |
16% decrease |
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