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A Boy weighing 40 kg climbs up a stair o...

A Boy weighing 40 kg climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kg does the same in 3 minutes. Compare:
The power developed by them.

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A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes.Compare: (i)the work done by them.and (ii)the power developed by them .

A boy of mass 40 kg climbs up a flight of 30 steps each 20 cm high in 2 min and a girl of mass 30 kg does the same in 1.5 min. Compare : (i) the work done, and (ii) the power developed by them (g = 10 m s^(-2) )

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IT takes 20 s for a person A of mass 50 kg to climb up the stairs. While another person B of same mass does the same in 15 s compare (i) work done (ii) power developed by the person A and B.

A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well,while his father does it in 2 minutes ,(a)compare: (i)the work ,and (ii)power developed by them. (b)How much work rach deos?Take density of water = 10^(3) kg m^(-3) and g=9.8 N kg^(-1)

A man weighing 60 kg climbs up a staircase carrying a load of 20 kg on his head. The stair case has 20 steps each of height 0.2 m. If he takes 10 s to climb find his power

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A boy mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate : (i)the force of gravity acting the boy . (ii) the work done by against the force of gravity . (iii)the power spent by the boy . (Take g=10 m S^(-2) )

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ICSE-SELF ASSESSMENT PAPER -1-SECTION .B.
  1. A Boy weighing 40 kg climbs up a stair of 30 steps each 20 cm high in ...

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  2. (a) Name the high energetic invisible electro magnetic wave which help...

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  3. What is an echo?

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  4. State two conditions for the formation of an echo.

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  5. A ray of light PQ is incident normally on the hypotenuse of a right an...

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  6. Two resistors of 4Omega and 6 Omega are connected in parallel to a cel...

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  7. Two resistors of 4Omegaand6Omega are connected in parallel to a cell t...

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  8. A lens produces a virtual image between the object and the lens. N...

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  9. A lens produces a virtual image between the object and the lens. D...

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  10. State Ohm's law.

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  11. A metal wire of resistance 62 Ohms is stretched so that its length inc...

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  12. A person is tuning his radio set to a particular station. What is the ...

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  13. Name the phenomenon involved, in tuning the radio set.

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  15. A half meter rod is pivoted at the centre with two weights of 20 gf an...

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  16. A half meter rod is pivoted at the centre with two weights of 20 gf an...

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  17. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  18. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  19. Give one use each of (a) microwaves, (b) ultraviolet radiations, (c) i...

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  20. The current rating of fuse is 10 A., Explain the statement.

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  21. Answer the following: (1) Name the three wires of the cable. (2)...

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