Recent content by ujellytek

You're right, thanks. The velocity then turns out to be ~27.38m/s instead of 4.849m/s

Done

Homework Statement The rock 'A' is dropped 100m above a river. After 2 seconds, rock 'B' is thrown down from the same height. What initial velocity must be given to rock 'B' so that both rocks hit the river at the exact same time? [No air resistance] Homework Equations What is the answer? The...

Homework Statement Finding the equation for the muzzle velocity by using conservation of energy. 2. The attempt at a solution Ek+Eg=Ek2+Eg2 Well I'm 100% sure the kinetic energy of the ball is transferred into the catcher. The displacement is 1.9cm which is 0.019m. Mb=0.0077Kg (mass of ball)...

-120, thanks I get it now

I have no idea what to do

v1=60 km/h [E] v2=60 km/h [W] ? *delta*v=??

Can you explain how to solve this?

I thought it was 0km/h but it was marked wrong, I just want to understand why.

Imagine a car is traveling east 60km/h, then after leaving the curve it's velocity is 60km/h west, what's it's change in velocity?

Ahh, that makes a lot of sense, my calc shows X1=6, which is probably 6+ some bugged value, and X2=i2 which is probably 6(which is bugged out) +i2, thanks a lot!

Ohh, I'm using a SHARP calculator that can use Quad formula by plugging in A,B,C of quadratic equation (it's never given me a wrong answer before), when I plug in 2.5 -30 and 100 I get i2 and what appears to be 6 (my screen is broken, but I can assure you it is a 6). When I Try my own quad...

Homework Statement There is a speedy car chase! A thief is getting away from a police officer. The distance between them at the start is 100m. The thief starts to accelerate at 5.0m/s^2 [F] from rest. Meanwhile the police is chasing him at its max velocity of 30m/s (sad... I know XD). Show that...

Alright thanks guys. You guys have given me enough info , thanks.

I've been searching around the web to figure out why photons shift towards the longer wavelengths as they travel from stars and other light sources but I haven't figured out why they loose energy as they travel ( and after reading some web pages I was told that they don't even loose the energy...