This has never happened to me before. I am struggling in physics. I dont get it at all! I read the book and I still do not understand. I need at least a B. I currently have a 72% C!! I am currently ranked 12th out of 22 students with that grade so apparently I am not the only not getting it. Is there anyone here that is familiar with physics enough to help me with my homework? Thanks.

Current Homework Problems:
1. Consider a 1099 kg automobile as it passes over a hill on a road that follows the
arc of a vertical circle of radius 48 m near its top. a) Show the forces acting on
the car at the top of the hill. cool.gif Find the normal force acting on the car when the
car is at rest. c) Find the normal force acting on this car when it travels over the
hill at 12 m/s. d) Find the maximum speed at which this car can pass over the hill
without leaving contact with the road. e) Would a more massive vehicle lose
contact with the road at a i) greater, ii) lesser, or iii) the same speed? Explain.

2. Air force pilots flying high-speed aircraft must be very careful to avoid loss of
consciousness due to the extreme forces that sharp turns can generate on their
body. Pilots refer to these forces as G-forces, but in reality, these forces are the
normal force the accelerating aircraft exert on the pilot. Thus, a G-force of 6 Gs
simply means that the normal force pushing upwards on the pilot is 6 times the
pilot’s weight. Currently, you are experiencing 1 G sitting in your chair. A negative
G-force means that the normal force is pushing down on the pilot. An untrained
individual risks blacking out when the G-forces exceed +5 G, while training,
fitness, and special apparatus can extend that to +9 G for many pilots. Here, we
will consider pilots flying in vertical circular arcs. a) Consider a pilot at the lowest
point of a circular arc banking upward. Find the tightest radius arc that both the
trained pilot and untrained individual can fly when traveling at 700 m/s (about
1500 miles/hr or Mach 2). Include a free body diagram. Note: you can use the
same equation for both parts. cool.gif Find an arc radius that would produce 0 G.

3. A block is hung by a string from the inside roof of a van. When the van goes
straight ahead at a speed of 25 m/s, the block hangs vertically down. But when
the van rounds a curve of radius 150 m at this speed, the block swings toward
the outside of the curve, making an angle with its previous position. a) Show the
forces acting on the block as it rounds the curve on a free body diagram. Show
the direction of the acceleration, too. cool.gif Determine the angle at which this block
hangs. Hint: work with components of tension and write weight as mg.

4. Consider an apple that weighs 1 N on the Earth’s surface. Find its weight far
above the Earth’s atmosphere such that its distance from the Earth’s surface
equals a) the Earth’s radius, cool.gif twice the Earth’s radius, and c) three times the
Earth’s radius. d) If these apples in space are released from rest (with respect to
the Earth’s center), do they i) remain motionless, ii) fall to the ground, or iii) orbit
the Earth? Explain.

Edit: every smiley face is suppose to be a "b)"

Formulas Let me know if this link works. The formulas are at the bottom. plus these two:

a=V^2/r

V=2(pie)r/T

 

Is this with calc or not? Cuz down here pre-med/pharm kids take physics w/o calc.

 

i just have to take algebra based thankfully.

 

It's actually easier with calc lol.

 

Physics is a class I would love to take. smile.gif

Sorry it's not coming easily for you Amanda.

 

 

yeah i took physics in high school and had to have a tutor and i only barely pulled off a B. It's interesting and i get it but only the real basics.

what i'm trying to say is you're fucked lol

is there a tutoring center at your school? mine has one and it's actually helpful even if i don't ever take advantage of it. GL with that

 

why i didn't go into architecture and engineering. look, go to a private tutor. it worked for me with precal and algebra and i completely suck at math and forget everything associated with numbers. worth the investment, just make sure the tutor is good. they advertise in colleges because it is illegal for them to tutor their own students.

everyone i knew struggled with physics. i had the benefit of never touching it.

 

Don't take what I'm saying the wrong way, but honestly physics wasn't that bad. It's not cake, far from it, but it sure is easier than Organic Chemistry. However, just like with any science and/or math course it requires hours of practice problems. Search the web for help as well. There are tons of sites offering help in what you are doing.

 

im actually in organic chemistry now as well. i find it much easier. i can predict chemical structures from a molecule and what it is reacted with. apparently thats suppose to be hard. huh.gif