Thursday

October 30, 2014

October 30, 2014

Posted by **vm** on Saturday, February 12, 2011 at 2:45pm.

A 5.00 g bullet moving at 648 m/s strikes a 670 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 440 m/s.

(a) What is the resulting speed of the block?

(b) What is the speed of the bullet-block center of mass?

(b) What is the speed of the bullet-block center of mass?

- AP PHYSICS MECH. -
**Damon**, Saturday, February 12, 2011 at 3:17pmMomentum before = 648 * .005

equals

Momentum after = 440*.005 + v * .670

solve for v

v = 1.55 m/s

Speed of center of mass does not change because total mass does not change

b)before : average speed = (648*.005 + 0*.670)/.675 = 4.8 m/s

c) after: average speed = (440*.005 + 1.55*.670)/.675 = 4.8 m/s sure enough

- AP PHYSICS MECH. -
**Anonymous**, Sunday, February 13, 2011 at 2:35pmThank you :)

- AP PHYSICS MECH. -
**Anonymous**, Sunday, December 16, 2012 at 1:04pmI like birds

**Answer this Question**

**Related Questions**

physics - A 7 x 10^-3kg bullet is fired into a 2kg wooden block initially at ...

physics - A 23- bullet traveling 230 penetrates a 3.6 block of wood and emerges...

physics - A 13 g bullet traveling 235 m/s penetrates a 2.0 kg block of wood and ...

Physics - A 13 g bullet traveling 226 m/s penetrates a 2.0 kg block of wood and ...

Physics - A 23 g bullet traveling 220 m/s penetrates a 4.2 kg block of wood and ...

physics - A 25 g bullet traveling at 280 m/s passes completely through a wooden ...

Physics - A 35.0-g bullet moving at 475 m/s strikes a 2.5-kg wooden block. The ...

physics - a 35 kg bullet moving at 475 m/s. strikes a 2.5 kg wooden block. the ...

Physics - A 13g bullet traveling 330 m/s penetrates a 2.0 kg Block of wood and ...

Physics HELP! - A 20.0 g bullet is fired horizontally into a 85 g wooden block ...