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2 years ago

A race car starts at rest and accelerates north at 12.27 m/s2 for 3.19 seconds. What

1 answer:

8 0

Final velocity is equal to initial velocity plus at (where a is acceleration and t is time), so Vf = Vi + at

Using that formula;

Vf = 0 + 12.27(3.19)

Vf = 39.14 m/s

Note: you started from rest, so your initial velocity is 0.

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2 years ago

If two oscillators connected to speakers create frequencies of 594 hz and 600 hz, what is the beat frequency when you hear both

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3 years ago

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2 years ago

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3 years ago

A rifle with a weight of 25 N fires a 4.5-g bullet with a speed of 240 m/s. (a) Find the recoil speed of the rifle. m/s (b) If a

asambeis [7]

Answer:

The recoil speed of the man and rifle is $v_{man}=0.016 ms^{-1}$ .

Explanation:

The expression for the force in terms of mg is as follows;

F=mg

Here, m is the mass and acceleration due to gravity.

Rearrange the expression for mass.

$m=\frac{F}{g}$

Calculate the combined mass of the man and rifle.

$m_{man,rifle}=\frac{650+25}{g}$

Put $g=9.8 ms^{-2}$ .

$m_{man,rifle}=\frac{650+25}{9.8}$

$m_{man,rifle}=68.88 kg$

The expression for the conservation of momentum is as follows as;

$m_{man}u_{man}+m_{bullet}u_{bullet}=m_{man}v_{man}+m_{rifle}v_{man,rifle}$

Here, $m_{man,rifle}$ is the mass of the man and rifle, $m_{rifle}$ is the mass of the rifle, $u_{man},u{bullet}$ are the initial velocities of the man and bullet and $v_{man},v{man,rifle}$ are the final velocities of the man and rifle and rifle.