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riadik2000 [5.3K]
3 years ago
11

A man has power of 90W and mass 60kg runs up a staircase in 40 second. If each step of staircase is 20m high calculate the numbe

r of steps
Physics
1 answer:
Zielflug [23.3K]3 years ago
5 0
Power is calculated by dividing the work done with the time interval of the motion. Work, on the other hand, is force times the distance traveled. Therefore, we can calculate as follows:<span>

Power=W/t = mgd/t
90 = 60(9.81)d / 40
d = 6.12 m

Number of steps = 20/6.12 = 3.27 or 3 steps</span>
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Need help... 44 points!!!!
vladimir1956 [14]

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Here applied force on right direction is more in magnitude then the friction force on left

So it will have net unbalanced force towards right due to which it will move towards right direction or in the direction of net unbalanced force

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The forces acting on the box are <u>UNBALANCED</u> .

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How many electrons must be added to an object to give it an overall net charge of -3.0 x 10^-7 C? The charge of an electron is -
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The number of electrons is 1.9\cdot 10^{12}

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brainly.com/question/2757829

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