3 years ago

If an electrostatically charged balloon is brought near other objects, which of the following will occur?

1 answer:

5 0

<span>If an electrostatically charged balloon is brought near other objects,
then ...

-- It will be attracted to objects of the opposite charge.
and
-- It will be attracted to objects with a neutral charge.</span>

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If an athlete leaps vertically at 4.0m/s, what maximum height does he reach?

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Hello
This is a problem of accelerated motion, where the acceleration involved is the gravitational acceleration: $g=-9.81~m/s^2$ , and where the negative sign means it points downwards, against the direction of the motion.

Therefore, we can use the following formula to solve the problem:
$v_f^2 = v_i^2 + 2gS$
where $v_i=4~m/s$ is the initial vertical velocity of the athlete, $v_f=0$ is the vertical velocity of the athlete at the maximum height (and $v_f=0~m/s$ at maximum height of an accelerated motion) and S is the distance covered between the initial and final moment (i.e., it is the maximum height). Re-arranging the equation, we get
$S= \frac{v_f^2-v_i^2}{2g}=0.82~m$

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