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What is direction of friction force? at any instant , when body is moving

Asked by Gulshan Kumar 16/07/2015 Last Modified 25/07/2020

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__________ of the following series in the spectrum of the hydrogen lies in the visible region of the electromagnetic spectrum. (Paschen Series, Balmer Series, Lyman Series, Brackett sEries)

balmer series

Narendra Kumar

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The energy of the electron of hydrogen orbiting in a stationary orbit of radius rn is proportional to __________. (rn, 1/rn, rn2, 1/rn2)

1/rn2

Narendra Kumar

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When an electron moves in a magnetic field ‘B’ with velocity ‘V’ the force acting on it is perpendicular to __________ (V but not to B, both V and B, B but not V)

Both V and B

Narendra Kumar

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The average kinetic energy of the molecules of the object is called its __________. (Heat, Temperature, Hotness, Coldness)

temperature

Narendra Kumar

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Dear friends, Please correct me in case I am wrong. I your opinion , what should be the maximum number of students in a coaching class, so that each student can have maximum dedicated time from the attending teacher in the classroom. In present days, cost and time of coaching / tuition matters a lot . The same will be demontrated by the following two examples : Example 1 : Suppose a student pays Rs. 4000/= per month ( 26 days in a month , excluding Sundays ), One hour per day , number of student is only one, then cost of coaching per minute works out to (Rs. 4000/=X 1 Student )/(26 days X 60 min/day ) = Rs.2.56 per min. cost and he will get dedicated time of 60 min. each day to carry on his studies. Example - 2 : Suppose a student pays Rs. 2000/= per month ( 26 days in a month , excluding Sundays ), One hour per day , number of student is 30 in a class, then cost of coaching per minute works out to (Rs. 2000/=X 30 Students in a coaching class ) / (26 days X 60 min/day ) = Rs.38.46 per min. cost and he will get dedicated time of only two min. each day for his studies. The above examples shows that though the monthly fees paid by each student is just half ( Rs. 2000/= see example -2 ) in case of classroom type of coaching as compared to the individual coaching ( Rs. 4000/= see example - 1 ), but on the other side cost of coaching per min. based on true dedicated time is 15 times higher in case of classroom type coaching with mass students than single student coaching. These can be however extrapolated for any number of students in a coaching class. As a result the speed of learning process of a student will be about fifteen times slower in classroom type coaching having mass students in a class ignoring the other factors. However, it may be the choice of the students and parents which option is better for them ? Regards, Sudhansu bhushan Roy.

Sir your calculations are excellent. I would like to add few things. 1. It depends on the student / parents choice at the end. 2. It never implies that effective attention to a student is 2-3 mins, so...

Sudhansu Bhushan R.

2 2

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