214. The flicker effect of fluorescent lamp is more pronounced at >(A) lower voltages → (B) higher voltages >(C) lower frequencies​

Weight of 100 cm of wood =8g

So, the weight of 54000 cm of wood =1/8×54000

=4320 g

=4.32kg

Answer:

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An electric train leaves a station starting from rest and attains a speed of 72 km/hr in 10 seconds. It travels at that speed for 120 seconds. Then it undergoes uniform retardation for 20 seconds to come to halt at the next station. Calculate a) the distance between the train stations. b) the average velocity of train.

Answer :

The distance between the train stations = 2700 m.

The average velovity of train is 64.9 km/ hr.

Given :

Here the given informations are

Initial velocity (u₁) = 0

Final velocity ( v₁) = 72 km/hr = 20 m/s

Time (t₁) = 10 seconds

Initial velocity (u₂) = 72 km/hr = 20 m/s

Final velocity ( v₂) = 0

Time (t₂) = 20 seconds

Time for uniform motion (t₃) = 120 seconds.

To find :

The distance between the train stations (S)

The average velovity of train (V)

Explanation :

We can divide the travel into 3 parts.

1.  Accelerated motion

2. Retarded motion

3. Uniform motion

x₁= u₁t₁+ ½ at₁²

a=v₁-u₁/t₁

 =(20-0)/10

 =2m/s²

x₁=0+½ ×2×10²

  = 100m

x₂=u₂t₂+ ½ at₂²

a=v₂-u₂/t₂

 =(0-20)/20

 = - 1m/s²

x₂=20×20+½ ×-1×20²

   = 200m

x₃= v₃ × t₃

  = 20×120

  =2400 m.

Then, he distance between the train stations (S)

        = x₁+x₂+x₃

        =100 + 200 + 2400

        =2700 m.

Total time taken (T) = t₁+t₂+t₃

                             = 10+120+20

                             = 150 seconds.

Average velocity (V) = S/T

                               = 2700/150

                               =18 m/s

=64.8 km/hr.

To learn more questions about the topic refer to the links below:

https://brainly.in/question/7172471

https://brainly.in/question/38175355

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Watershed development programme is an initiative of the government.It is done by the Non-Government OrganisationNGOs.It is the conservation recharging and judicious use of water resources like underground water rivers etc and lands within the watershed area Benefits of watershed development are: 1.It helps in conservation of water by plantation making bunds canals etc. 2.It makes the land fertile and supports the growth of trees plants and cultivation. 3.It helps in the preservation of water and its resources. 4.It prevents soil erosion.

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Answer:

electronic configuration of chromium written as 1s2 2s2 2p6 3s2 3p6 4s1 3d5 and not as 1s2 2s2

Answer:

electronic configuration of chromium written as 1s2 2s2 2p6 3s2 3p6 4s1 3d5 and not as 1s2 2s2

Explanation: