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.
I am doing physics homework and I came upon a problem that I had forgotten how to do, and i do not believe my answer is correct. I have tried to Google this but failed, can you please tell me if i have done this correct?
the question:
"4. Give the horizontal and vertical components of...
Homework Statement
In a physics lab experiment, a 6.25 kg box is pushed across a flat table by a horizontal force F
If the box is moving at a constant speed of 0.400 m/s and the coefficient of kinetic friction is 0.120, what is the magnitude of F?
What is the magnitude of F if the...
Homework Statement
0.25-kg skeet is fred at an angle 30 to horizontal with a speed 25m/s.
when it reaches tha max. height, it is hit from below by a 15g pellet traveling verticaly upwared at speed of 200m/s. the pellet is embedded to the skeet.
1) how much higher did the skeet go up?
2) how...
Homework Statement
i have a problem from an in class lab where i have to find the initial velocity of the ball. given is the horizontal and vertical displacement of the projectile.
Dy(height)=100cm
Dx(range)=200m
0(theta)= 15degrees.
Find the initial velocity.Homework Equations
not sure what...
Homework Statement
Two blocks connected by a string are pulled
across a rough horizontal surface by a force
applied to one of the blocks.
The acceleration of gravity is 9.8 m/s2 .
1st block = 2 kg
2nd block = 8 kg
Force on second block at 52◦
μ = 0.29
[ 2kg ]-------[ 8kg ]/ 52 degrees
If each...
Homework Statement
The coefficients of static and kinetic friction between a 59 kg box and a horizontal surface are 0.66 and 0.37, respectively.
(a) What is the acceleration of the object if a 330 N horizontal force is applied to the box?
(b) What is the acceleration if the applied...
the pathway for a mineshaft is described as follows: The first shaft extends north and down at an angle of 3.5 degree for 225ft to a vertical shaft which 125ft long. A third shaft then extends north and down at an angle 6.8 degree for 175ft. What is the total depth below ground level at the end...
Homework Statement
A 4-kg object sliding at speed 5 m/s along a smooth horizontal surface encounters a rough surface, 1.5 meters wide. The coefficient of kinetic friction over the rough surface is 0.20. After leaving the rough surface, the object continues over smooth surface until it strikes...
Homework Statement
I'm supposed to determine the [vertical] coefficient of restitution of a tennis ball, and the horrizontal coefficient of restitution, and if possible produce an equation or ratio connecting the two.
Vertical CoR: 0.760
Constant x-component velocity: 0.853 m/s
Homework...
Homework Statement
A horizontal force F of 16 N pushes a block weighing 6.0 N against a vertical wall (Fig. 5-47). The coefficient of static friction between the wall and the block is 0.61 and the coefficient of kinetic friction is 0.41. Assume that the block is not moving initially.
(b)...
Honestly, I am soo confused...And this is the last problem left. If I get it wrong then I'm in trouble. Please help! I don't know what to do at all.
A skier squats low and races down a(n) 11 degrees ski slope. During a 5 second interval, the skier accelerates at 2.3 m/s^2.
(A) What is the...
[SOLVED] Horizontal ProjectileMotion
Homework Statement
Divers jump off a cliff, at a height of 35m above sealevel. To land safely, they aim for 5m from the base of the cliff. What push off speed is neccesary?
Sy= -35m
Sx= 5
ay= -9.8m/s/s
Vi = ?
Homework Equations
Not sure how to...
Homework Statement
Use completing the square method to rewrite the equation of the parabola
y^2 – 4y – 44 = 16x in the form (y-y0)^2 = 4A(x-x0)
Hence find:
a) the coordinates of the vertex
b) the coordinates of the focus
c) the equation of the line that passes through the focus...
A Major league pitcher can throw a ball in excess of 41.3m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0m away from the point of release?
So Ay=-9.8
X=17m
t=?
Vox=0
V=41.3
y=(Vy^2-Voy^2)2g
I thoguht i would use this...
Homework Statement
"Match functions and their horizontal asymptotes."
Homework Equations
lim f(x)
x-> + infinity
lim f(x)
x-> - infinity
The Attempt at a Solution
http://img198.imageshack.us/img198/7678/45328107.jpg
im just stuck at this... I am sure that everything is...
Homework Statement
the question says, find the Horizontal Asymptotes of the fallowing:
f(x) = (cot^-1) (x^2 - x^4)
f(x) = (cot^-1)(x)
The Attempt at a Solution
do i convert cot to it's components?
i have no idea, please help me.
i appreciate your time.
My question is if I actually did the said problem correctly and if there is perhaps an easier way of coming across an answer. Thanks!
Homework Statement
There are two blocks present (A and B) A is connected to B via a rope and the applied force is affecting B (to the right).
Find the...
Homework Statement
http://www.grabup.com/uploads/7800261909D120091B14DB13F106.png
That's an image I have made of the diagram we are given. T1 and T2 are tension 1 and [/i]tension 2[/i] respectively. I need to work out the length of those by:
a). Maths
b). Scale Drawing
Homework Equations...
Homework Statement
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 8.7 m/s relative to the ground. When the train moves at a constant velocity, the raindrops make an angle of θ = 67° when they move past the window as the...
Homework Statement
A dolphin leaps out of the water at an angle of 32° above the horizontal. The horizontal component of the dolphin's velocity is 7.7 m/s. Find the magnitude of the vertical component of the velocity.
Homework Equations
Vy=V0y + ayt
The Attempt at a Solution
4.63...
a stealth bomber on a training mission drops one of its bombs from a height of 3500m during level flight. The bomb travels a horizontal distance of 1.25 km. What was the plane's horizontal speed?
a brick is thrown upward from the top of a building at an angle of 25 degrees to the...
Homework Statement
Romeo is chucking pebbles as gently as he can up to Juliet's window. That is, he wants the pebbles to hit the wendow with the least possible speed. He is standing at the edge of a rose garden at Dv = 7.90 m below her window and at Dh = 8.50 m from the base of the wall...
Ok, so in the red box it says that the tension is obtained from the horizontal dimension. This seems very wrong to me. Could someone explain this to me? Isn't there tension in the vertical dimension?
Homework Statement
http://img27.imageshack.us/img27/9276/inclineplanesolution.jpg
Okay, so we did an experiment in physics class where we launched a projectile from Point A (on the floor). The projectile obviously traveled in a parabolic motion and ended at Point B (on the floor again, so no difference in launching and landing heights).
We measured the distance from Point...
Homework Statement
Two blocks connected by a rope of negligible mass are being dragged by a horizontal force (Fig. P5.43). Suppose F = 68.0 N, m1 = 12.0 kg, m2 = 18.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.100. (a) Draw a free-body diagram for...
Homework Statement
Could anyone help me with these vector problems?
1. At the top of its flight, an arrow has a horizontal velocity of 35ms-1. Two seconds later its velocity is 40ms-1 at an angle of 29 degrees below the horizontal. After a further 2 seconds, it is moving at 53ms-1 at 49...
Homework Statement
Find the horizontal asymptote to the graph: f(x) = 2x2/(x4-81)1/2
Homework Equations
How do I factor the bottom? Because for, the HA, I compare the coefficients.
Homework Statement
What are the vertical and horizontal asymptotes for:
2x2/ SQRT(x4-81)?
Homework Equations
The Attempt at a Solution
For one VA, I got x=3. Are there any more? I am troubled with this square root on the bottom.
Homework Statement
I am asked to add two horizontal vectors graphically. The result being the Cvector:
Cvector= Avector + 2*Bvector
Homework Equations
Avector has a length of 4 in the east direction.
Bvector length 1 in the west director.
2*Bvector= length 2
The Attempt at a...
Homework Statement
A couch cushion of mass m is released from rest at the top of a building having height h. A wind blowing along the side of the building exerts a constant horizontal force of magnitude F on the cushion as it drops as shown in the figure. The air exerts no vertical force...
Hi,
20m straight length horizontal pipe (60 mm internal diameter), steam flows at rate 0.5 kg/s, at midpoint there is a valve in the line. inlet pressure to this section of line is 5 bar (gauge), pressure at end of line is 3 bar (gauge). mass quality of steam is 0.8 and 2 phase flow occurs in...
Homework Statement
A ball is thrown eastward across level ground. A wind blows horizontally to the east, and assume that the effect of the wind is to provide a constant force to the east, equal in magnitude to the weight of the ball. At what angle theta (to the horizxontal) should the...
Homework Statement
A 104 g stone is whirled in a horizontal circle on the end of an 83 cm long string. The stone takes 1.2 s to make each complete revolution. Determine the angle that the string makes with the horizontal. Homework Equations
f=ma
v=(2*pi*r)/T
Centripetal acceleration=V^2/rThe...
Homework Statement
If a projectile is fired from the origin of the coordinate system with an initial velocity v_0 and in a direction making an angle \alpha with the horizontal, calculate the time required for the projectile to cross a line passing through the origin and making an angle...
Homework Statement
a mass (m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (m2), which hangs vertically.
If the acceleration is .098 m/s^2 and m1 is 1.0 kg how much must m1 must be to keep it at this acceleration
Homework...
Homework Statement
Two blocks of masses 2kg (a) and 3kg (b) rest on a smooth horizontal surface and are connected by a taut string of negligible mass. A force of 10 N is applied to the 3kg mass as shown in figure (below). Calculate the tension in the string between them.
The answer is 4N...
I'm trying to solve the following problem using a MATLAB script but I keep getting an error:
Show on the same axes the maximum height and horizontal distance traveled for an object thrown at a speed of 10ms-1 at an angle ranging from 0 to π/2. Equation for distance & height are:
D= v2/g...
For the life of me I cannot figure out this problem: give an example of a function that has two horizontal asymptotes and three vertical asymptotes. Any help on this topic would be greatly appreciated.
I'm a calc newb, and I am a little stumped here. Thanks for your help. How do you do this?
http://www.webassign.net/www29/symImages/0/8/103b04681b693242466ef17cefccc1.gif
Homework Statement
A mass Z is suspended by a vertical rope attached to the roof, and a second rope attached horizontally to a wall.
what is the tension in each rope if Z is hanging straight down?
What are the rope tensions?
Suppose Z has a mass of 800kg. what is the tension in the pair of...
Homework Statement
An airplane flies through a horizontal curve at a speed of 250km/h (69.44m/s). Radius=0.7km or 700m
Find the load of the pilot on the seat if her mass is 67kg.
Homework Equations
centripetal acceleration=v^2/r
and then the solution times the mass of the pilot, but...
Homework Statement
A shopper pushes a 7.5 kg shopping cart up a 13 degree incline. Find the magnitude of the horizontal force needed to give the cart an acceleation of 1.41 m/s^2.
Homework Equations
F = m * a
The Attempt at a Solution
I am not sure how to set up the F(x) and...
Homework Statement
A 50 gram mass is attached to a massless spring and allowed to oscillate around an equilibrium according to:
y(t) = 1.2*sin( 3.1415*t ) where y is measured in meters and t in seconds
(a) What is the spring constant in N/m ?
(b) What is the total Mechanical Energy in...
The equation describing the horizontal range of a projectile is
R = \frac{v_0^2}{g} \sin{2\theta}
The previous equation states that the projectile wouldn't travel any distance if launched at 0 degrees. Further, the range of a projectile decreases from 45 to 0 degrees, but it seems...
Homework Statement
A block of mass M_1 rests on a block of mass M_2 which lies on a frictionless table. The coefficient of friction between the blocks is \mu . What is the maximum horizontal force which can be applied to the lower ( M_2 ) block for the blocks to accelerate without...
Homework Statement
The thin uniform rod in the figure below has length 2.5 m and can pivot about a horizontal, frictionless pin through one end. It is released from rest at angle θ = 40° above the horizontal. Use the principle of conservation of energy to determine the angular speed of the rod...
Homework Statement
A railroad hopper car has a mass of 30000 kg when empty and contains 50000 kg of coal. As it coasts along the track at 5 m/s the hopper opens and steadily releases all the coal onto a platform below the rails over a period of 4 s. What is the horizontal impulse delivered to...