Physics, 23.11.2019 06:31 hfrench5130

An old clock has a spring that must be wound to make the clock hands move. which statement describes the energy of the spring and hands of the clock?

a)
the spring has kinetic energy and the hands have kinetic energy.

b)
the spring has kinetic energy and the hands have potential energy.

c)
the spring has potential energy and the hands have potential energy.

d)
the spring has potential energy and the hands have kinetic energy.

Answers

Explanation:

When the spring is wound, then it gathers potential energy in the form of tension energy. As it slowly unwinds, the potential energy is converted to kinetic energy of the hands' movements of the clock. This energy is channeled through the use of cogs/gears in the clock.

Answer from: Quest

here we know that ball will drop down by total distance 3.2 m

so here we know that

$v_{yi} = 0$

$\delta y = - 3.2 m$

now using kinematics

$\delta y = v_{yi} t + \frac{1}{2}at^2$

$-3.2 = 0 -\frac{1}{2}(9.8) t^2$

$t = 0.81 s$

now in the same time it will cover horizontal distance of 0.75 m

$\delta x = 0.75m$

so speed of the ball will be

$v = \frac{delta x }{\delta t}$

$v = \frac{0.75}{0.81} = 0.93 m/s$

Answer from: Quest

its a 5.5 n

glad that

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An old clock has a spring that must be wound to make the clock hands move. which statement describes...