Question

Forensic scientists can determine the speed at which a rifle fires a bullet by shooting horizontally into a heavy block hanging by a wire. As the bullet embeds itself in the block, the block and embedded bullet swing up; the impact speed is determined from the maximum angle of the swing. Assume the bullets enter the block right after leaving the muzzle of the rifle. Which bullet and speed combination would make the block swing higher? A 7mm Remington Magnum bullet of mass 9.67 g and muzzle speed 934 m/s. A .204 Ruger bullet of mass 2.14 g and muzzle speed 1280 m/s. Using your answer in the previous part, determine the mass M of the block so that when hit by the bullet it will swing through a 69.0° angle. The block hangs from wire of length 1.40 m and negligible mass.

          Forensic scientists can determine the speed at which a rifle fires a bullet by shooting horizontally into a heavy block hanging by a wire. As the bullet embeds itself in the block, the block and embedded bullet swing up; the impact speed is determined from the maximum angle of the swing. Assume the bullets enter the block right after leaving the muzzle of the rifle.

Which bullet and speed combination would make the block swing higher?

A 7mm Remington Magnum bullet of mass 9.67 g and muzzle speed 934 m/s.
A .204 Ruger bullet of mass 2.14 g and muzzle speed 1280 m/s.

Using your answer in the previous part, determine the mass M of the block so that when hit by the bullet it will swing through a 69.0° angle. The block hangs from wire of length 1.40 m and negligible mass.

Forensic scientists can determine the speed at which a rifle fires a bullet by shooting horizontally into a heavy block hanging by a wire. As the bullet embeds itself in the block, the block and embedded bullet swing up; the impact speed is determined from the maximum angle of the swing. Assume the bullets enter the block right after leaving the muzzle of the rifle.

Which bullet and speed combination would make the block swing higher?

A 7mm Remington Magnum bullet of mass 9.67 g and muzzle speed 934 m/s.
A .204 Ruger bullet of mass 2.14 g and muzzle speed 1280 m/s.

Using your answer in the previous part, determine the mass M of the block so that when hit by the bullet it will swing through a 69.0° angle. The block hangs from wire of length 1.40 m and negligible mass.

Added by Nancy E.

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