Homework Statement
A 13 N force with a fixed orientation does work on a particle as the particle moves through displacement = (3i - 5j + 3k) m. What is the angle between the force and the displacement if the change in the particle's kinetic energy is (a) +25.6 J and (b) -25.6 J...
"weight" generally means mass*gravity. Otherwise, they would have said "mass". So, the net force on the blocks should be weight (mass * gravity) and the force on the other side (the crane).
Won't one of these forces overcome the other? If so, which one? This will give you a net force (mass *...
I've got it now, thank you for all of your help. My problem was that I was assuming the Net force on B to still be zero. I should have resolved for T and still included mass of B times acceleration of the system... rather simple in hindsight.
I thought that I had the idea, but only one part of it was correct. My approach is this:
Part A (initially stopped): since the block is stopped, then one of the forces (78N or sin(29)*100N) must overcome the other force AND the force of static friction. Neither one can do this, thus the...
Homework Statement
- Taken directly from the homework -
- Attachment has the diagram -
Body A in Fig. 6-33 weighs 100 N, and body B weighs 78 N. The coefficients of friction between A and the incline are μs = 0.54 and μk = 0.22. Angle θ is 29°. Let the positive direction of an x-axis...
Got it, it's because Tan2 = sec2(x)-1
this allows you to integrate to get:
(16pi) [(tan(pi*y/3)) (3/pi) -y]
Since the lower limit is 0, the tan part becomes 0 so the answer is F(b) - 0 = F(b)
Thank you for your help, my teacher isn't much assistance so I'm learning how to use the...
Homework Statement
If a solid is generated by rotating the line (x=4tan(y*pi/3)) on the y-axis. Find the volume between the area 0≤y≤1.
Homework Equations
I know that, when slicing a section (A(x)), I will generate a circle. This gives me two of the dimensions (by using area of a...
Thanks for your responses, I'll have to try the 3 equation idea and recheck my signs and run both to see if either/both work as I expect them to. This has been driving me nuts.
Homework Statement
A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.2s later. If the speed of sound is 340m/s, how high is the cliff?
V0= 0
A=-9.8m/s2
Ttotal=3.2s
Tsound=Y/340
Y0=Height
Y=0 (height at sea)
Homework Equations
Y=Y0+V0T+1/2(-9.8m/s2)T2...
Yeah, you're right, thanks. So, it turns out that from a dead stop, it takes only about 2.5 seconds longer than from at full speed (given my rate of acceleration). Which makes sense since it averages half the velocity for 5 seconds.
So, just let me know that this is correct.
time = [...
Actually, I just realized that this answer is completely messed up. Where did I go wrong? I'm I way off the equation that I'm using in the first place? There is no way that it can go faster from zero than from a continuous full speed. Plus, it's way too fast. Now I'm really lost...
I was watching Mystery Science Theater 3k and they said something about a train a mile long. I decided to make up a problem to see if this was a rational length for a train by determining how much time it might take a train like that to pass.
Train Length (L) = 1 mile (5280 feet)
Velocity...