Thursday

December 18, 2014

December 18, 2014

Posted by **Ron** on Monday, January 6, 2014 at 5:46pm.

Find the angle (in degrees) through which the block rises, if the strings are 0.540 m in length.

- Physics -
**Damon**, Monday, January 6, 2014 at 6:26pmAt collision use conservation of momentum

Mbullet Vi bullet = (Mbullet+MBlock)V

solve for V, the speed of the block with the bullet in it

calculate kinetic energy

(1/2) m v^2

that becomes potential energy when the block stops

m g h

so

v^2 = 2 g h

solve for h

now get angle

hypotenuse is L, length of string

T = string angle from vertical

cos T = (L-h)/L

solve for T

by the way you can approximate cosine for small angles

Cos T = 1 - T^2/2

1 - T^2/2 = 1 - h/L

T^2 = 2 h/L

T = sqrt(2 h/L)

note T will be in RADIANS if you do that

**Answer this Question**

**Related Questions**

Physics - a) A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and ...

physics - A bullet (m = 0.0250 kg) is fired with a speed of 91.00 m/s and hits a...

physics - A bullet (m = 0.0290 kg) is fired with a speed of 94.00 m/s and hits a...

physics - A 12.0 g bullet is fired into a 13.9kg wooden block that is hanging ...

Physics - A bullet of mass is fired horizontally with speed at a wooden block of...

Physics- so confused!! - A bullet with a mass of 5.40 g is fired horizontally at...

physics - The ballistic pendulum is a device used to measure the speed of a fast...

physics - A bullet of mass 4.7 g is fired horizontally into a 2.4 kg wooden ...

physics - A heavy wooden block rests on a flat table and a high-speed bullet is...

physics - A heavy wooden block rests on a flat table and a high-speed bullet is ...