3 years ago

Describe three possible careers in physical science

Physics

1 answer:

Amanda [17]3 years ago

6 0

Answer:

physical sicence boilagiy sxcience and earth science

Explanation:

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Explanation:

Given that,

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Final speed of the ball, v = -1.5 m/s (as it rebounds)

Impulse is equal to the change in momentum. So,

$J=m(v-u)\\\\J=0.2\times (-1.5-2)\\\\J=-0.7\ N-m$

So, the impulse given to the ball is 0.7 N-m and it is away from the wall. Hence, the correct option is (c).

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3 years ago

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Explanation:

Given

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inclination $\theta =10^{\circ}$

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Speed at the bottom $v=40 m/s$

From Work Energy Theorem

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$W_{thrust}=F\times x=280\times 287.93=80,620.4 J$

$W_{friction}=-\mu mg\cos 10$

substitute in 1

$24,500+80,620.4+W_{friction}=\frac{1}{2}\times 50\times 1600$

$W_{friction}=40,000-24,500-80,620.4$

$-\mu \cdot 50\times 9.8\times 287.93=-65,120.4$

$\mu =\frac{65,120.4}{141,085.7}=0.46$

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