A guy wire attached to a vertical pole of height 18 m is 24 m long and has a stake attached to the other end. How far from the base of the pole should the stake be driven so that the wire will be taut?
First man to reach South Pole, Roald Amundsen (Norway)
2. First man to reach North Pole, Robert E. Peary
3. First woman to reach North Pole, Mrs. Karoline Mikkelsen
4. First...
The value of ‘g’ at the equator of the earth is less than that at poles. Therefore, the packet falls slowly at equator in comparison to the poles. Thus, the...
(c) mg is not greater than mv2/r
Explanation :
At the top position the weight of the water mg acts downward to bring it down while due to inertia water tries to escape upward...
(c) √(3gl).
Explanation:-
Let speed at the top = v, it is balanced by weight mg, so, mv²/l=mg
→v²= gl
Now let the speed when string is horizontal = v'
Here total energy = ½mv'²=½mv²+mgl
v'²=v²+2gl =...
(a) The string becomes slack when the particle reaches its highest point.
(d) The particle again passes through the initial position
Explanation:
Since the particle is just able to complete the circle, at...
(a) the spring was initially compressed by a distance! and was finally in its natural length
(b) it was initially streched by a distance x and was in its natural length
Explanation:
Since in the...
(a) periodic
EXPLANATION:
Since a uniform circular motion repeats itself at a regular time interval.
(b) not true because it is not a to and fro motion. ...
The correct answer is (a) 1/8
Explanation:
For wires of the same material, the elongation is directly proportional to the length and inversely proportional to the cross-sectional area.
Δl/l = F/AY
→Δl =Fl/AY {Here...