Recent content by canicon25

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Homework Statement A 7.0kg ladder is placed against a smooth wall so that it makes an angel of 72deg to the horizontal. A 56kg person stands 4.0m from the bottom of the ladder. What force does the wall exert on the ladder? What is the coefficient of friction between the ladder and the...

so i tried it and did get correct answer 0.5mv2+Q=-GMm(1/r1-1/r2) r1=radius Earth + 400000km r2=radius Earth + 100000km when i solve for v i get 2133 m/s

upon further reading i found that ΔEk+Q=-0.5ΔEP for CIRCULAR ORBITS ONLY am i correct in assuming that ΔEk+Q=ΔEp would apply for a object falling to Earth

i am stumped. i tried using ΔEk+Q=-(0.5)ΔEp where Ek= 0.5mv2 and Ep= -GMm/r Q is heat energy. Given in problem.

1600v2=-G(1600)(5.98E24)/(6.38E6+400000) - (-G)(1600)(5.98E24)/ (6.38E6+100000) - 8.3E8 v=1407 m/s still not getting the correct solution.

Homework Statement Homework Equations 2ΔEk=-ΔEp The Attempt at a Solution -Gm1m2(1/r1-1/r2)-Q=mv2 plug in given values solve for v. my answer is 5.35x106m/s given answer is 2100m/s

Homework Statement A 150 kg cart moving at 13 m/s east collided with a 420 kg wagon moving at 5.0 m/s east. The cart rebounded westward with a speed of 3.0 m/s . What was the speed of the wagon after the collision? Observe standard Cartesian coordinates. Homework Equations KE1+KE2=KE1'+KE2'...

i did make diagrams, i just didn't post them. Ft = T1 Fs = T2 the equations i wrote are from the diagrams left T1-mg=ma T1-9.81=a T1=9.81+a right T2-mg=ma T2-49.1=5a T2=49.1+5a The middle block would be -T1-(-T2)=ma -T1+T2=ma -T1+T2=7a i am assuming the acceleration is the same for all...

Homework Statement determine the acceleration of the system. there is no friction on the surface Homework Equations Fnet=maThe Attempt at a Solution Left block Ft=9.81+a1 Middle block Ft=Fs-7a2 Right block Fs=5a3+49.1 Not sure how to proceed with this one. What is equal to what?

Homework Statement a 4.0kg block is held against a brick wall and is just kept from sliding down by the force F. The coefficient of friction is 0.35 between the block an d the wall. Find the normal force and the minimum force F that will keep the block from sliding. Homework...

my original question was simple am i going about setting up the equation correctly. but my question now is why are the two moments opposite in sign. if there is a measure of 46kg on the scale why is it not a component of the force acting down on the scale?

Homework Statement A trailer carrying a boat is supported by a scale which initially reads 48kg. The boat is moved 0.15m further back on the trailer. The scale now reads 37kg. What is the mass of the boat? Homework Equations torque = F(perpendicular) * d For...

a 120kg person stands on the surface of an asteroid of radius 600m. the person leaves the surface with 15J of kinetic energy and reached a maximum height of 300m above the asteroid's surface. what is the mass of the asteroid. i am stuck please help me with the problem. 15-GMm/r(i) = 0 -...

Can anyone point me to a good site that explains current induction, specifically when a coil is placed around an energized, current carrying conductor? I would like to understand this principle to understand how power can measured in 3 phase power systems by using coils as a measuring element.