Recent content by darklich21

nvm i figured it out, but I am going to correct your response. The radius is NOT 0, but instead the raidus of the earth, while on the other side of the equation, it's the radius of the Earth + the distance to the moon.

how can the radius be 0, the radius in my equation is in the denominator. it would make 1 part of the expression undefined

Ok correction, I solved part b. I did use m1v1+ m2v2=v(m1+m2), and I got 3.5 m/s, which is correct. But how do I solve part a? What equation should I use

Homework Statement A 10500kg freight car rests against a spring bumper at the end of a raildroad track. The spring has constant k = 3.4 x 10^N/m. The car is hit by a second car of 9400 kg mass moving at 7.5 m/s, and the two cars couple together. a) what is the maximum compression of the...

Homework Statement Two rockets are launched from Earth's surface, one at 17 km/s and the other at 22 km/s. How fast is each moving when it crosses the moon's orbit? Homework Equations Kf + Uf= K0 + U0 0.5mvf^2 -GMm/R = 0.5mv0^2 - GMm/R The Attempt at a Solution So I attempted to...

ah, yes, i forgot the mass of the elevator, i got 8.3, which i rounded down to 8 ppl, thanks

Homework Statement Blocks of 1.0, 2.0, and 3.0 kg blocks are lined up on a table (1kg block being on the left, 2kg in the middle, 3kg being on the right). A rightward poiting 12 N force is applied to the leftmost block. What force does the leftmost block exert on the middle one? Homework...

Homework Statement A 1kg object is moving in the x direction at 15.6 m/s. Just 3.4s later, it is moving at 32.4 m/s at 29.1 degrees to the x axis. What are the magnitude and direction of the force applied during this time? Homework Equations The Attempt at a Solution I really...

Homework Statement A 2kg mass and a 3kg mass are on a horizontal frictionless surface, connected by a massless spring with spring constant k=136N/m. An 18 N force is applied to the larger mass. How much does the spring stretch from its equilibirum length? (answer in cm) Homework Equations...

Homework Statement An elevator cable can stand a maximum tension of 19000N before breaking. The elevator has a mass of 520 kg, and a maximum acceleration of 2.16 m/s^2. Engineering safety standards require that the cable tension never exceed two-thirds of the breaking tension. How many 65-kg...

Can you show me in terms of projectile motion equations and the kinematics equations?

Homework Statement A diver leaves a 3m board on a trajectory that takes her 3.0m above the board, and then into the water a horizontal distance of 3.0m from the end of the board. At what speed and angle did she leave the board? Homework Equations Vf^2=Vi^2 + 2ad Y=Y0 +VyT - 0.5gt^2...

I had a bit of a break through, Ok so I found the time at which they will be at the same distance, which was 2.4 hours. I did 4600km/700km/hr= 6.57hr, which is how long the 2nd plane would take to reach the other side, and I also did 4600 km/1100km.hr which is 4.18 hours, which is how long it...

Im not seeing how that helps me at this point. Doesn't this problem have something to do with equating equations or something of the sort?

D=vt