In an experiment designed to determine the velocity of a bullet fired by a certain gun, a wooden block of mass M = 530.0 g is supported only by its edges, and a bullet of mass m = 7.25 g is fired vertically upward into the block from close range below. After the bullet embeds itself in the block, the block and the bullet are measured to rise to a maximum height of 30.0 cm above the block's original position. What is the speed of the bullet just before impact? m/s

Velocity of bullet = 179.33 m/s

Explanation:

Given:

Mass of block(M) = 530g

Mass of bullet(m) = 7.25g

Height (h) = 30 cm = 0.30 m

Find:

Speed of bullet before impact.

Computation:

After impact velocity (v) =                [∵ g = 9.8]

After impact velocity (v) = 2.42 m/s

Law of conservation .

(M+m)v = M(velocity of block) + m(Velocity of bullet)

(530+7.25)(2.42) = 530(0) + 7.25(Velocity of bullet)

Velocity of bullet = 179.33 m/s

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

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