Conservation of Momentum problem.

AI Thread Summary
The problem involves a 50.0g bullet embedded in a 7.00kg stationary block, moving together at a velocity of 5.00m/s. The conservation of momentum principle is applied to find the bullet's initial velocity. After converting the bullet's mass to kilograms, the initial calculations yield an incorrect result of 710m/s. A clarification indicates a minor error in the calculations, leading to the correct answer of 706m/s. The discussion emphasizes the importance of unit conversion and careful calculations in solving momentum problems.
Imbadatphysics
Messages
7
Reaction score
0

Homework Statement


Im stuck on this question please help. =/
a 50.0g bullet travels right and becomes embedded in a 7.00kg stationary block. the block and embedded bullet moves off at a velocity of 5.00m/s right. what was the initial velocity of the bullet? the answer is 706m/s right.

Homework Equations



The Attempt at a Solution


IMG_20150716_205938.jpg
 
Physics news on Phys.org
Watch your units. Try including units when you set up your equation.
 
ohh i see so instead of 50g i convert it to 0.05kg i got 710m/s its still 4m/s off?
 
nvm I am bad sorry for wasting ur time gg it was 35.25 instead of 35
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Angular momentum for a bullet and a rod attached to a ceiling
Replies
17
Views
1K
State whether the distance x for the block would be greater/less/same
Replies
25
Views
1K
Conservation of momentum (wrecking ball hits a stationary object)
Replies
10
Views
3K
Conservation of Momentum Problem - Mechanical and Kinetic Energies
Replies
2
Views
955
Conservation of momentum in a bullet-block-spring system
Replies
6
Views
3K
A bullet collides perfectly elastically with one end of a rod
Replies
21
Views
2K
Angular Momentum- Conserved or not?
Replies
17
Views
407
Momentum Problem -- Bullet fired into a block of wood
Replies
2
Views
2K
Momentum conservation (ballistic pendulum)
Replies
2
Views
1K
Conservation of Mechanical Energy - Which Equation To Use?
Replies
9
Views
1K

Hot Threads

Recent Insights

Back
Top