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3 years ago

7

On a spring scale that measures force, a reading shows the force of an object to be about halfway between 7 N and 8 N. Which of

the following would be the most accurate measurement for the force? Question 8 options: 0.0075 N 0.75 N 750 N 7.5 N

1 answer:

Over [174]3 years ago

3 0

Your answer is 7.5 N

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$P_2$ = Momentum of the ball after hit

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$\theta$ = Angle the pin makes with the horizotal after getting hit by the ball

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$P_i=P_1\cos55^{\circ}+P_2\cos\theta\\\Rightarrow P_2\cos\theta=P_i-P_1\cos55^{\circ}\\\Rightarrow P_2\cos\theta=18-13\cos55^{\circ}\\\Rightarrow P_2\cos\theta=10.54\ \text{kg m/s}$

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$P_1\sin55=P_2\sin\theta\\\Rightarrow P_2\sin\theta=13\sin55^{\circ}\\\Rightarrow P_2\sin\theta=10.64\ \text{kg m/s}$

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$P_2\sin\theta=10.64\\\Rightarrow \theta=sin^{-1}\dfrac{10.64}{14.98}\\\Rightarrow \theta=45.26^{\circ}$

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