okay thank you, I got 7.7x10^-1 J
Now for question 5) they ask for the velocity of the ball on the other side after the collision. So I would use the formula :Eki+epi=Ekf+Epf. And for the height I would have .026m. So the initial PE would this time be zero and the final KE would be zero to...
1. This lab is based on 'Newtons cradle' () I can't link to the actual lab video because that requires my password and username...not that I don't trust you guys/gals but its a public site. Anyway, he let's the first ball go at 3.0 cm above it's equilibrium position and asks for me to calculate...
O okay, I did convert the weights to masses I just forgot to right that down in my notes, so yes that's 3061.22KG(5m/s) which is 15306. Sorry I left that out.
I am not to sure what you mean, I put them tip to tail. The 4081KG truck is going west at a momentum of 32653N*s then the 3061KG truck...
A 5.0 kg object is accelerated from rest to 6.0 m/s while moving 2.0 m across a level
surface. If the force of friction is 4.0 N, calculate the power output
I used d=vt to find the time which was .33sec then i put that into P=Fd/t and had (49-4)(2)/.35 and got 270 Watts
A heavy box of mass “n” kg slides 12.0 m along a straight friction less 30 degree incline. If
the box starts from rest at the top of the incline, what is its speed at the bottom. (hint: think
energy)
I used Fd=1/2mv^2 which was msin30(12)=1-2mv^2 and I canceled the masses then came...
:How much work did a horse do that pulled a 200 kg wagon 80 km along a level road if
the effective coefficient of friction was 0.060?
I used W=Fd to find the work (W=1960*80000=156800000) then I got the force of friction by ff=(coeff)Fn and got (.06)*1960=117.6. I then got the...
:An object explodes into three equal masses. One mass moves East at a velocity of 15.0
m/s. If a second mass moves at a velocity of 10.0 m/s 45.0 South of East, what is the
velocity of the third mass?
I drew these vectors tip to tail, then used cos law to determine the velocity...
A 40000N truck moving West at a velocity of 8.0 m/s collides with a 30000N truck
moving South at a velocity of 5.0 m/s. If these two vehicles lock together upon impact, what
is the initial velocity of the vehicles after the collision? I first found the momentum's of both trucks...
A stationary lift raft of mass 160 kg is carrying two survivors with masses of 55 kg and
72 kg. They dive off the raft at the same instant, the 55kg person East at 4.4 m/s and the 72
kg person North at 4.2 m/s. AT what speed and in what direction does the raft start to move?
So i started off...
Q:A 46 g steel marble collides obliquely with an identical stationary marble, and continues
at 55 to its original direction. The collision is perfectly elastic. What is the angle between
the direction taken by the target ball and the original direction of the incident ball?
I know the...
Q:A sandbag stops a 12 g bullet which was traveling at 860 m/s. The bullet penetrated a
distance of 24 cm into the sand?
a) How long did it take the bullet to stop?
b) What average force acted on the bullet?
first i used ∇p=Ft so 10.32=18490t t=5.6*10^-4 sec
then i put that into e=1/2mv^2...
Q:A boy of mass 45 kg is traveling without a seat belt, in a car with a velocity of 14 m/s.
When the car stops suddenly, he is stopped by the windshield in a distance of 0.024m.
What force does he exert on the windshield?
i set the impulse of the vehicle (mv)= to FD (because (delta)E=W=Fd)...
Q:Two blocks are tied together on an incline The first box is on a 30 degree incline with he horizontal and is 1 KG, the wire from it runs over a pulley that goes to a mass of 2KG . If both the pulley and the incline are frictionless:
a) What is the acceleration of the 1.0 kg block up the...
Thank you for the warm welcome, Okay ill put them all in separate threads.
I got that by first finding the momentum before. p=1200(20)=24000N*s
then i went epi+eki=epf+ekf...since there's no height I could take out the potential energies so i now have eki=ekf
I then found the impulse of the...