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4 years ago

The speed of a bullet of mass 20 g is 216 kilometre-per-hour what is kinetic energy in joules

Physics

1 answer:

chubhunter [2.5K]4 years ago

3 0

Answer:

2160joules

Explanation:

M = 20g = 0.02kg

V = 216km/h

K.E = 1/2 m (v)^2 = 1/2 × 0.02 × 216

K.E = 2.16kj

1kj = 1000joules

2.16kj = 2160joules

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Read 2 more answers

The force required to stretch a Hooke’s-law spring varies from 0 N to 63.5 N as we stretch the spring by moving one end 5.31 cm

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Answer:

Force constant will be 1195.85 N/m

Work done will be 1.6859 J

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We have given the force, F = 63.5 N

Spring is stretched by 5.31 cm

So x = 0.0531 m

Force is given , F = 63.5 N

We know that force is given by $F=kx$

So $63.5=k\times 0.0531$

k = 1195.85 N/m

Now we have to find the work done

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$W=\frac{1}{2}kx^2=\frac{1}{2}\times 1195.85\times 0.0531^2=1.6859J$

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3 years ago

The speed of a bullet of mass 20 g is 216 kilometre-per-hour what is kinetic energy in joules​

The speed of a bullet of mass 20 g is 216 kilometre-per-hour what is kinetic energy in joules