Rs aggarwal class 8 exercise-20A qno.-24

Answer:

Answer:

with oxygen

flagellum pores

nostrils...

Explanation:

Your safety is your personal responsibility.

Always follow the correct procedures.

Never take shortcuts.

Take responsibility and clean up if you made a mess.

Clean and organize your workspace.

Ensure a clear and easy route to emergency exits and equipment.

Be alert and awake on the job.

Be attentive at all times to your work surroundings.

When in doubt, contact your supervisor or manager for instruction, guidance, or training.

Answer:

Your safety is your personal responsibility.

Always follow the correct procedures.

Never take shortcuts.

Take responsibility and clean up if you made a mess.

Clean and organize your workspace.

Ensure a clear and easy route to emergency exits and equipment.

Be alert and awake on the job.

Be attentive at all times to your work surroundings.

When in doubt, contact your supervisor or manager for instruction, guidance, or training.

Never take risks when it comes to safety.

Obey safety signs, stickers, and tags.

Take short breaks when you keep up a repetitive motion for a long period of time, and sit, stand, or walk with good posture.

Report serious injuries immediately to a supervisor and get emergency assistance

Answer:

Refer to attachment

Hopes this will helpful for you

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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Answer:

C) lower frequency

Explanation:

Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz (twice of the utility frequency; the lamp is lit on both the positive and negative half-wave of a cycle).

This flickering can cause problems for some individuals with light sensitivity and are associated with headaches and eyestrain.

The flicker effect of fluorescent lamps is more pronounced at lower frequencies