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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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ddog ddog
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10 years ago
A lorry, mass 1.2x10^3, parked on a platform used to weigh vehicles. The lorry compresses the spring that supports the platform by 0.030m. Calculate the energy stored in the spring.

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tswayfarertswayfarer
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10 years ago
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#2
10 years ago
Spring constant k = F/y = m*g/y = 1200*9.8/.03 = 392000 N/m'energy stored in spring' ES = ½k*y² = ½*392000*.03² = 176.4 J
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#3
10 years ago
I guess you mean 1.2x10^3 kg.

The weight = mg = 1.2x10^3 x 9.8

Energy stored = ½ x force x (extension or compression)
= ½ x (1.2x10^3 x 9.8) x 0.030 joules

E.g. see about half-way down the link
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