I remember being told that heavier things fall at the same rate as lighter things when everything else is equal. But this guy does a demonstration of a Xenon balloon falling faster than a Neon balloon. Why??? Also an overloaded plane may not be able to fly, but it has the same aero dynamics...
Let me draw a free body diagram for the man. I assume that for both cases (a) and (b), the man pulls the block up with uniform velocity.
(1) In case (a), realising that the man is in equlibrium (##\Sigma F = 0##) the normal reaction on the man ##N_a = w_M + T## is given by ##N_a = (50+25)\times...
I understand that the weight of the car does not change (assuming mass of the car stays the same) because of f=mg. But I am not so sure about of the aerodynamics of the car plays a role. Say, a faster car might have more air under their wheels and might exert less force on to the ground. Maybe a...
We understand that the crucial thing about the problem is that the volume of water present in the three containers are not the same. Also, we note that in each case the weight of the container is the total weight of its contents. (A student might be confused as to why should be so - after all...
When a body accelerates down(climbs down) a rope, why does its apparent weight reduce? Oh wait, does it even reduce in the first case?
If yes, is it because of the newtons first law of motion, which states that a body in motion tends to be in motion and a body at rest tends to be at rest.
So...
For convenience, I have marked the C.G. of the sphere as ##G_S## and that of the bar only as ##G_B##. The C.G. of the combination is halfway between them, shown by the green ##G_C##. My answer is that the combination will rotate about ##G_C## (centre of the bar) as it falls.
I wonder if I am...
Summary: How much weight can the bars support?
Three one-meter-long bars with cross-section area A = 1 square centimeter support a rigid plate of weight W. For steel, E = 200 GPa and S = 400 MPa. Determine the maximum weight W the bars can support for three cases:
(i) all three bars are...
Ok so I've asked my physics teacher and a statics teacher as well and I couldn't get a straight answer from either. So here's my questions...
Correct me if i'm wrong, but isn't the gram a unit of mass? Not weight? I thought that for mass to become a unit of weight, it has to have to...
Homework Statement
[/B]
2. Homework Equations
Fs = Nμ
W = mg
Fy = Fsin(θ)
Fx = Fcos(θ)
The Attempt at a Solution
[/B]
Hello all at PhysicsForums,
I have a question on angled force and static friction. From my attempt below, I think I have found the maximum force required and would need...
I am trying to compare an experiment on spinal changes due to zero-g in astronauts. Researchers simulated zero-g spinal elongation by suspending human subjects so that no part of their body touched the ground.
This figure shows the % change in disc thickness for each subject compared to data...
Information Given:In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed.
Question: Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 708...
Homework Statement
What is the apparent weight of a 70-kg astronaut 3800 km from the center of the Earth's Moon in a space vehicle when
a) Moving at a constant velocity
b) Accelerating toward the Moon at 2.9 m/s^2?
State direction in each case
Homework Equations
wt = m(g+a)
wt = m(g-a)
Fgr =...
Let's say I'm riding a bike at constant speed. Also assume that the person riding is rigid, no moving of the persons body, constant center of gravity. Assuming that there is sufficient friction between the tires and road. If I apply the front brakes, I will likely tip over. If I apply the...
Hello, I am working on a project where I am trying to find the weight distribution on a 4 wheeled vehicle that is traveling diagonally up an incline. You can effectively think of the vehicle as having a pitch and a yaw angle in the body frame. Using an arbitrary location of the total center of...
Hello,
I have been looking at physics calculators, but cannot seem to find precisely what I need. I don't need a very precise answer, merely a realistic ballpark one.
I need to know how we find the rough speed of an object's movement when a certain amount of force is applied to it.
For...
Homework Statement
Hi. I ve got a problem, where I have to show torque by integrating the weight of the rod over the whole it's length.
Homework Equations
[/B]
Result, what I am suppose to get is:
## \tau_{rod} = \frac{mgb}2 ##
The Attempt at a Solution
[/B]
When I try to integrate, Im...
Most hitches are rated as "X, 0.1*X weight-bearing, Y, 0.1*Y weight-distributing" where Y > X and the first number is trailer weight, second number is tongue weight. It has been described to me many times that the weight distributing hitch (with 'stabilizing/leveling' bars) "takes weight off...
Good morning forum,
I'm currently in the middle of a project where I'm installing a new chemical storage tank outside. I need to lay a new concrete slab for the tank to lay on. My question is how thick should the concrete slab be? The tank will be stationary, when filled it will weigh...
Homework Statement
The problem is stated in the picture.
Homework Equations
Fg=Gm.1m.2/r^2
The Attempt at a Solution
I found a similar question where someone wanted to find how high will the weight be half the weight on the surface. Here is one of the answers:
F =G.m1.m2/r^2
F´ =G.m1.m2/r´^2...
Homework Statement
How does the gradient of the graph compare to the weight force?
The graph is a Mass vs 1/Acceleration graph (y axis = mass, x axis = Acceleration, It was mentioned to do this.)
Homework Equations
Explain by referring to the formula for Newton's Second Law.
The Attempt at a...
Homework Statement
I am trying to perform a weighted fit of a data set ##(x,y)## shown below. The only information I have are the two vectors ##x## and ##y## and the uncertainty present in the ##y## values (##=0.001##).
Homework Equations
The Attempt at a Solution
Statistical weighting of...
Hello! I am an AP Physics student and had a quick question for validity. I was prompted with this question in class today:
Example 7: An 8-meter ladder of weight 355 N leans at an angle of 50° to the floor against a smooth vertical wall. Assume the center of weight (gravity) for the ladder is at...
Homework Statement
Assume that the beaker is half filled with Hg, the steel ball being lighter will float in it half-submerged. Now we pour water into the beaker, so that the beaker is completely filled with water on top, Hg in the bottom and steel ball floating between them.
Now my question...