A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 5m aways from the wall ?
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Moderator is used in a nuclear to slow down fast neutrons generated after a fission event in the reactor consider a fast neutron (mass `m_(n)`) moving
Correct Answer - `((M-m_(n))/(M+m_(n)))^(2)`
2 Answers 1 views
A pile 4m high driven into the bottom of a lake is 1m above the ` `water . Determine the length of the shadow of the pile on the bottom of the lake if
Correct Answer - 2.88m
2 Answers 1 views
A ladder is inclined to a wall making an angle of 30° with it. A man is ascending the ladder at the rate of 3 m/sec. How fast is he approaching the wa
Correct Answer - `1.5 m//sec`
2 Answers 3 views
A girl stands 170 m away from a high wall and claps her hands at a steady rate so that each clap coincides
i. When the girl makes 60 claps in 1 minute, the value of speed of is 340 m/s. ii. The girl is at a distance of 226.67 m from the wall...
2 Answers 1 views
300 men can construct a200m long wall in 12 days working 8 hours a day. In how many days can 120 men construct 180 m long wall working 9 hours per day
\(\frac{M_1D_1H_1}{W_1}=\frac{M_2D_2H_2}{W_2}\) M1 = 300, D1 = 12, H1 = 8, W1 = 200 M2 = 120, D2 = ? H2 = 9, W2 = 180 \(\frac{300\times12\times8}{200}=\frac{120\times D\times7}{180}\) D = 24 days
2 Answers 1 views
A ladder of length 50 m rests against a vertical wall, at a height of 30 m from the ground. Find the inclination of the ladder with the horizontal. Al
Correct Answer - 40 m
2 Answers 1 views
A ball is projected from ground in such a way that after 10 seconds of projection it lands on ground 500 m away from the point of projection. Find out
Correct Answer - (i)`theta=45^(@)` (ii)`50sqrt(2)m//s` (iii)`50m//sec`
2 Answers 10 views
A tower stands vertically on the ground. From a point on the ground, 20m away from the foot of the tower, the angle of elevation of the top of the tow
Correct Answer - `34.64 m`
2 Answers 1 views
A ladder is placd in such a way that its foot is a distance of 15 m from a wall and its top reaches a window 20m abvoe the ground. Find the leng of th
Correct Answer - 25 m
2 Answers 1 views
A 15 m long ladder reached a window 12 m highfrom the ground on placing it against a wall at a distance a. Find the distance of the foot of the ladder
Correct Answer - 9 m
2 Answers 1 views