What is Horizontal: Definition and 978 Discussions
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red-giant branch in stars whose masses are similar to the Sun's. Horizontal-branch stars are powered by helium fusion in the core (via the triple-alpha process) and by hydrogen fusion (via the CNO cycle) in a shell surrounding the core. The onset of core helium fusion at the tip of the red-giant branch causes substantial changes in stellar structure, resulting in an overall reduction in luminosity, some contraction of the stellar envelope, and the surface reaching higher temperatures.
Hi,
I have a physics question I'm not sure how to answer.
I need to find the horizontal distance a ball will travel when rolled down a ramp off a table.
The height of the table is 70.5cm
The time it took to leave the table and hit the ground is 0.335s
Using trial and error we found that the...
a point mass is constrained to move in a horizontal plane and is attached to four fixed pegs by 4 light springs. The four pegs are arranged at the corners of a square of side root2*a. Each spring has a natural length of a/2 and a spring constant a. If the mass is displaced towards one corner...
in the diffraction experiment, the light source and the slit are in the same horizonatal line.
My question is, if the light source is placed at another position which is no longer in the previous horizontal line, would we still get the same diffraction pattern?
Will the diffraction pattern...
Water weighs about 6lbs per gallon. So if one has a column of water, say, at 10 gallons, the pressure over an area is about 60lbs. This can be deduced to pounds per square inches.
Question:
How much pressure, per square inch, does water exert on a vertical wall such as a swimming pool...
A shelf bracket is mounted on a vertical wall by a single screw, as shown in Figure P12.59. Neglecting the weight of the bracket, find the horizontal component of the force that the screw exerts on the bracket when an F = 86.0 N vertical force is applied as shown.
Ok so we have three...
This question I was working on last light though I've solved it (by doing as the book has shown)...is giving me major cause for concern... I'm going to have to slightly re-word the books question so as to explain it without a diagram:
A particle P of weight 2kg is fastened to a length of...
I was thinking about a question where when 2 similar objects with different masses were dropped from the same height that they would hit tthe ground at the same time. It then occurred to me if the same would happen if the objects were given a horizontal component. i.e if they were rolled off an...
An object of mass 4.0 kg is whirled in a horizontal circle
of radius 0.40 m with a constant speed. If the tension in
the wire is 80 N, a=20 m/s, v= 2.83m/s, T= 0.89 s find:
d the number of revolutions made every minute.
in a water tank involving the launching of a small model boat,the model's initial horizontal velocity is 20ft/s and its horizontal acce varies linearly from -40ft/s^2 at t=0 to -6ft/s^2 at t=t(1) then remains equal to -6ft/s^2 until t=1.4s.Knowing that v=6ft/s when t=t(1), determine the value of...
ok have a look at the diagram posted. When someone broke their femur (thigh bone) the muscles around the femur would compress tightly and thereby shorten the bone once it heals back. SO the apparatus described in the diagram is what they used to do to prevent the femur from growing back shorter...
Could somebody give me a quick demo of how to convert from one system to another.
I have a homework to do and none of my lecture notes seem to help me!
A 50kg sprinter, starting from rest, runs 50m in 7.0s at constant acceleration.
a) What is the magnitude of the horizontal force acting on the sprinter?
b) What is the sprinter's power output at 2.0s, 4.0s, and 6.0s?
I think maybe the 'magnitude' part is confusing me.
F = ma
V(avg) =...
Hi! If anyone could pass on any hints as to how to go about figuring out this type of problem...thanks! I just need guidance as to how to determine F... attached is a diagram.
The horizontal surface on which the object slides is frictionless. If M=4.0kg, the tension in string 1 is 12N...
Hi ,
please help me with this question
We have 3 blocks on an horizontal surface (frictionless). We apply a force F=8N
What are the forces on each 3 blocks.
My solution:
For the block 1 I found: m1g(down), Normal reaction R1 ( up), R2/1 (left)
Here is there an R1/2 (right) force of...
Ok...Here is the problem.
A block of mass 4 kilograms, which has an initial speed of 6 meters per second at time t=0, slides on a horizontal surface.
(a) Calculate the work W that must be done on the block to bring it to rest.
For this problem, I used the formula W= 1/2mvf ^2– 1/2mvi ^2...
You buy a plastic dart gun, and you wnt to find its max. horizontal range. you shoot the gun straight up, and it takes 4s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?
I got the initial velocity, which is 19.6 m/s. I know I have to incorporate...
Question? There is a Large Cube, with a mass of 25 kg, it is being accelerated across a horizontal FRICTIONLESS surface by a horizontal force P. There is a small cube with a mass of 4 kg in contact with the front surface and will slide down and fall off unless P is sufficiently large. The...
Theory says that a cubical box when subjected to a force horizontally(not at the centre of gravity) then the force will tend to rotate the box around the centre of gravity. Any proof can be given for this?
Ahh I am already stuck on a question. I just need help getting started.
Anyways this is the question
A tennis player serves a ball horizontally, giving it a speed of 24 m/s from a height of 2.5 m. The player is 12 m from the net. The top of the net is 0.90 m above the court surface. The...
The figure shows a small object of mass m = 1kg can slide without friction on a wedge of mass M = 3kg inclined at angle \delta=30 degree . What horizontal force F must be applied to the wedge if the small block is not to move with respect to the wedge?
I do it in this way:
By Newton`s 3rd...
Air Resistance & Horizontal Distance
Warning: Calculus Required
This was a discussion question in my class's Young & Freedman University Physics book. Page 150, Chapter 5, #29.
Q5-29 When a batted baseball (kicked football, whatever floats your boat, assume the initial vertical position...
Two masses M1=3.80kg and M2=8.10kg are stacked on top of each other as shown in the figure. The static coefficient of friction between M1 and M2 is μs=0.400. There is no friction between M2 and the surface below it. What is the maximum horizontal force that can be applied to M1 without M1...
What do some fish have a horizontal tail fin,
while others have a vertical tail fin ?
Are there some functions that one type performs better than the other...
if so, what advantages would a vertical tail fin have over a horizontal one?
What advantages would a horizontal tail fin have over...
Four blocks are on a horizontal surface.
https://www.physicsforums.com/attachment.php?attachmentid=4000&stc=1
randomlabel.png
The blocks are connected by thin strings with tensions Tx, Ty, Tz. The masses of the blocks are A=44.0 kg, B=21.0 kg, C=24.0 kg, D=35.0 kg. Two forces, F1=75.0N...
The independance of horizontal and vertical motion...
Obviously it is possible to prove the independance of horizontal and vertical motion empirically - we only need look at projectile motion following a parabolic path. However, I have never found a convincing algebraic proof the for the...
Be advised this is not a homework question, even though it is in regards to a physics book I purchased over the summer to get a headstart on my upcoming AP class.
I was reading the chapter about acceleration, and the book seems to state that there is no such thing as horizontal acceleration...
The horizontal pipe has a cross-sectional area of 40.0 cm^2 at the wider portions and at the constriction. Water is flowing in the pipe, and the discharge from the pipe is 6.0 x 10^-3 m^3/s (6.0 L/s).
a) Find the flow speed at the wide portion.
b) Find the flow speed at the narrow portion...
How do i find out the horizontal force the wheels on a toy car exert on the ground if i know the acceleration and the coefficient of friction?
I have a coefficient of friction of 0.62
and an acceleration of 0.40056 m/s^2
Any help is helpful =) thank you.
Given coefficient of kinetic friction is zero and the coefficient of restitution is e:
A particle of mass m, collides at an angle (theta), with speed v, onto an infinite mass horizontal surface.
Collision time is 0.2 seconds.
What is the horizontal distance traveled by the particle...
the question: a board 2 ft long with weight 50 lb is pressed against a wall. what force, applied at 30 degrees, should be applied to keep it horizontal?
i'm not sure how to go about this, so i started by converting the weight of 50 lb to 22.67 kg, then getting a force of mass at 2.31 N
then...
am i doing this right?
Determine a value of the constant b so that the graph of y=x^2+bx+17 has a horizontal tangent at (2, 21+2b)
ans: y'(2)=0
y'=2x+b
0=2(2)+b
b=-4
what do u need the y-coordinate (21+2b)for?
My teacher also requires me to draw a diagram...can anybody show me a diagram...
16x^2+9y^2+192y-36y+468=0
Was the original conic i had to conver this into standard form and got
\frac {(x+6)^2} {9} + \frac {(y-2)^2} {16} =1
Im not sure if this is a horizontal or vertical ellipse
A 12 kg sled is pulled along at a constant velocity on a horizintal surface by a horizontal force of 11N. How much horizontal force is needed to pull the sled at a constant velocity it two 57 kg girls are sitting in it?
How would I go about solving this?
Thanks, Amanda
ok, so i got this assignment for the march break and our teacher hit us with this weird question.
You are pushing horizontally on a 3.0kg block of wood, pressing it against the wall. if the coefficient of friction between the block and the wall is μ = 0.60, how much force must you exert on...
Is there a way to mathematically or physically prove that horizontal motion and vertical motion are effectively independant? ie - is it possible to derive this fact from, say, vectors?
I know that is is true - the parabola shape of projectiles wouldn't make sense otherwise, but is there a...
Can anyone give me some clues as how to do this problem. I have been on it for ever and am stumped. Any help greatly appreciated. Thanks
Two wires are tied to the 2.0 kg sphere shown in the figure . The sphere revolves in a horizontal circle at constant speed.
For what speed is the tension...
A hunter aims directly at a small target (on the same level) 68 m away. If the bullet leaves the gun at a speed of 186 m/s, by how much will it miss the target?
I just need to know what formula I should use to solve this problem?
A man is puling a box across the floor. Assume that the force of friction can be ignored and that the acceleration of the box is 1.27 m / s^2. Find the angle to the horizontal that the man must pull.
Given that the mass of the box is 15 kg. and the tension of the rope is 65N.
Just a quick question which i don't seem to get the right answer for.
"A parent holds a small child in a swing so that the angle of the swing support is at 20 degrees to the vertical.The child's weight is 200N and the swing seat weighs 50N.What horizontal force must the parent apply"
I...
A 1.00-kg object is attached to a horizontal spring. The spring is initially stretched by 0.100 m, and the object is released from rest there. It proceeds to move without friction. The next time the speed of the object is zero is 0.500 s later. What is the maximum speed of the object?
I...
I'm not sure where this should go - I didn't see any LaTeX-related forum.
Is there a way to create a horizontal rule that doesn't take up the entire width of the page?
Thanks,
Sam
I've been trying to solve the following statics problem dealing with suspension bridges:
Let d1=span length from tower to shore, let d2=mid-bridge span length (tower to tower). The main cable makes an angle of 24 degrees below horizontal to the top of the support tower on the d2 side and 30...
Hi! This is the first question on my homework, so it's suppost to be the easiest, but I'm not sure how to tackle it. It's a Bernoulli's principle problem. Here it is:
A horizontal pipe 11.6 cm in diameter has a smooth reduction to a pipe 4.72 cm in diameter. If the pressure of the water...
A ball is attached to a horizontal cord of length L whose other end is fixed.
a. If the ball is released what will be its speed at the lowest point of its path?
(1/2)mv^2 = mgr, or v^2 = 2gr, v = sqrt(2gr)?
b. A peg is located a distance h directly below the point of attachment of the...
I been having trouble lately with my phyiscs HW probs. Here is only that ti'm confused on:
Three wires are connected to form a vertical H. The cross piece, mass 0.050 kg and length 0.10m , can slide up and down the vertical wires without friction. The device is placed in a horizontal field...