A 30kg hammer strikes a steel spike (nail) 2.30 cm in diameter while moving with speed 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110s. The average strain in the spike during the impact will be

( $Y = 2 \times 10^{11} N / m^{2}$ )

10^-2

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10^-3

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10^-4

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10^-5

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Solution

The correct option is C
10^-4

$F_{a v g} = \frac{△ p}{t} a n d s t r a i n = \frac{s t r e s s}{Y}$

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A 30kg hammer strikes a steel spike (nail) 2.30 cm in diameter while moving with speed 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110s. The average strain in the spike during the impact will be

( $Y = 2 \times 10^{11} N / m^{2}$ )

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A 30kg hammer strikes a steel spike (nail) 2.30 cm in diameter while moving with speed 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110s. The average strain in the spike during the impact will be (Y=2×1011N/m2)

The correct option is C 10-4 Favg=△ptandstrain=stressY

A 30kg hammer strikes a steel spike (nail) 2.30 cm in diameter while moving with speed 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110s. The average strain in the spike during the impact will be

( $Y = 2 \times 10^{11} N / m^{2}$ )

The correct option is C
10^-4

$F_{a v g} = \frac{△ p}{t} a n d s t r a i n = \frac{s t r e s s}{Y}$