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3 years ago

a man of mass 50 kg climbs up stairs each of height 0.2 m in 20 seconds .calculate the power of the man

Physics

1 answer:

Delicious77 [7]3 years ago

4 0

How many stairs?
You can use this to find the work
U
W=mgh
And the power by
P=W/T

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3 years ago

A diver leaves the end of a 4.0 m high diving board and strikes the water 1.3s later, 3.0m beyond the end of the board. Consider

shutvik [7]

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The motion of the diver is the motion of a projectile: so we need to find the horizontal and the vertical component of the initial velocity.

Let's consider the horizontal motion first. This motion occurs with constant speed, so the distance covered in a time t is

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d = 3.0 m is the horizontal distance covered

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t = 1.3 s is the duration of the fall

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$v_x = \frac{d}{t}=\frac{3.0 m}{1.3 s}=2.3 m/s$

Now let's consider the vertical motion: this is an accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. The vertical position at time t is given by

$y(t) = h + v_y t - \frac{1}{2}gt^2$

where

h = 4.0 m is the initial height

vy is the initial vertical velocity

We know that at t = 1.3 s, the vertical position is zero: y = 0. Substituting these numbers, we can find vy

$0=h+v_y t - \frac{1}{2}gt^2\\v_y = \frac{0.5gt^2-h}{t}=\frac{0.5(9.8 m/s^2)(1.3 s)^2-4.0 m}{1.3 s}=3.3 m/s$

So now we can find the magnitude of the initial velocity:

$v=\sqrt{v_x^2+v_y^2}=\sqrt{(2.3 m/s)^2+(3.3 m/s)^2}=4.0 m/s$

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3 years ago

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All of the orbitals in a given subshell have the same value of the "<span>magnetic and principal" quantum number

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3 years ago

a man of mass 50 kg climbs up stairs each of height 0.2 m in 20 seconds .calculate the power of the man​

a man of mass 50 kg climbs up stairs each of height 0.2 m in 20 seconds .calculate the power of the man