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.
A mass is tied to a string and whirled in a horizontal plane. The tension in the string provides the centripetal force required for circular motion of the mass. But which force balances the weight mg of the mass?
Homework Statement
A ramp is made by laying one end of a board on the level floor and the other end on top of a 4.0-foot-high wall, which is 8.0 horizontal feet away. A 3.0 foot-in-diameter ball is rolled under the ramp until it is wedged between the underside of the ramp and the floor. How...
Homework Statement
The two hot-air baloons in the drawing are 48.2(Left) and 61.0(right) m above the ground. A person in the left baloon observes that the right baloon is 13.3 degrees above the horizontal. What is the Horizontal distance x between baloon the two baloons
Left Air Baloon=...
I thought that horizontal asymptotes were asymptotes and now I'm hearing that they can be crossed... Is this true? If so, why and how?
Okay, wait a second, I mean horizontal asymptotes. According to: http://www.purplemath.com/modules/asymtote2.htm
"As I mentioned before, it is common and...
from Applied Mathematics and Modeling for Chemical Engneers (Richard G. Rice)
Two vertical cylindrial tanks, each 10 m high,are installed side-by-side in a tank farm, their bottoms at the same level.The tanks are connected at their bottoms by a horizontal pipe 2 meters long,with pipe inside...
Here's the problem:
2 Battleships are traveling at the same speed and at the same direction. They both have the same range, i.e. they can both only fire a maximum distance which is the same for both of them.
BB1 is in front of BB2, who is pursuing BB1.
They are out of range.
My...
Homework Statement
A block with a weight of 2.9 N is at rest on a horizontal surface. A 1.3 N upward force is applied to the block by means of attached vertical string.
(a) What is the magnitude of the force of the block on the horizontal surface?
Homework Equations
I'm not sure...
A bridge rises 321m above the Arkansas river. Suppose you kick a rock horizontally off the bridge. The magnitude of the rock's horizontal displacement is 45.0 m. Fine the speed at which the rock was kicked. (This is not what i ask you here)
Does the ball travel 321m vertically in free fall...
Prove this...
A particle of mass m is traveling along the x-axis with a constant horizontal velocity v0i. When the particle passes through the origin, it experiences a Drag Force which is proportional to the square of the particle's speed (Fd = - b/v^2i... drag coefficient b.
Questions
A)...
Homework Statement
A hawk flies in a horizontal arc of radius 13.5 m with a speed of 3.9 m/s.
What is its centripetal acceleration? (I correctly found this to be 1.1267 m/s².)
Next question is: If it continues to fly along the same horizontal arc but increases its speed at a rate of...
Homework Statement
The half a sphere with a 'm' mass and 'r' radius is equilibrated on a plan absolutely polished horizontal with the side of the AB wire. So the surface of the half a sphere has with the horizontal plan an alpha angle. Find, after the break of the wire, the velocity of the O...
Homework Statement
A soccer player kicked a ball up at a 30-degree angle at 20 m/s. Find the hang time, max. height and horizontal range.
Homework Equations
x(sub y)=(1/2)at^2 + v(sub i sub y)
Meaning... displacement = half of acceleration times time squared plus initial velocity in...
Homework Statement
The inside diameters of the larger portions of the horizontal pipe in Figure P9.40 are 2.80 cm. Water flows to the right at a rate of 2.00 10-4 m3/s. Determine the inside diameter of the constriction. Answer in (cm)
Here is the picture...
https://chip.physics.purdue.edu/protected/IEalgebraMimg/uiuc101-09-block.ie/pic.gif
A small block of mass 0.91 kg slides without friction on a horizontal table. Initially it moves in a circle of radius r0 = 0.63 m with a speed 1.5 m/s. It is held in its path by a string that passes through a...
1. A uniform 5m ladder of mass 12kg rests against a wall with its base 3m from the wall. A painter of mass 55kg sits 3.5m of the way up the ladder. what is the horizontal force in N exerted on the ladder by the wall? a)110.45 b)178.45 c)232.67 d)327.08
in the previous problem what is the...
Homework Statement
A microwave's turntable spins 3.0 revolutions per minute. It has a 250.0g cup of coffee placed 15.0cm from its centre. Find its period of revolution, its tangential velocity and the centripetal force on the cup.
2. The attempt at a solution
period of revolution...
A string, 50cm long, has a stone of 100g tied to its end, and it is swung in a horizontal circle of radius 30cm. Calculate the tension in the string.
Because the string is longer than the radius of the circle, the path of the string must form a cone shape. Using the measurements, and forming...
a block slides along a horizontal plane at an initial velocity of 10m/sec. After sliding 4 meters it reaches a 35 degree incline and slides up the hill. the coefficient of kinetic friction is 0.4 for all surfaces.
a) how fast is it going when it reaches the incline?
b) how far up th incline...
Homework Statement
20. A 873-kg (1930 lb) dragster, starting from rest, attains a speed of 26.3 m/s (58.9mph) in 0.59 s.
-----a. Find the average acceleration of the dragster during this time interval.
My solution:
Given variables:
M=873kg
Vo=0
Starting time: 0
V=26.3m/s
T=0.59...
Homework Statement
Draw and FBD of a rubber stopper (mass) in circular horizontal motion. Be realistic here: Is the tension force on the stopper truly horizontal?
This question is from an experiment where a rubber stopper is tied to a string and swung horizontally. When the question says...
Homework Statement
1. A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 8.0 x 10^1 N is being applied to the sled rope at an angle of 53 degrees to the ground, what is the force of friction between the sled and the snow?
A. 83 N
B. 64 N
C. 48 N
D...
Here a newsstory about horizontal gene transfer:
Compare with neodarwinism:
Since gene swapping by organisms causes genetic variation, does this contradict neodarwinism which claims genetic variation is caused by random mutations?
I've built a horizontal spring launcher, and i need to calculate the extension needed in the spring in order to launch a projectile horizontally to a given distance.
The launcher consists of a striker connected to the spring... when the spring is pulled back and let go the strike moves...
The most important question to answer here is what happens when an object undergoing Uniform Horizontal Circular Motion(tethered to a string, NOT using gravity as sole centripital acceleration) will behave when it reaches that perfect right angle to gravity. I would like to insert a drawing but...
I don't have a diagram for this, so I'm going to do my best to describe it.
A glass tube lying horizontally has three different cross-sectional areas, A, B and C. Area A is 12 cm^2, B is 5.6 cm^2, and C is 6.0 cm^2. Mercury (density = 13,600 kg/m^3) is being pushed through the tube by a...
Homework Statement
A bicycle has 30cm radius tires with gear and pedal dimensions as shown. IF the maximum vertical force that a 70kg rider can exert is equal to his/her body weight, what is the horizontal force that can be exerted on the ground by the rear tire...
A block of mass 3.0 kg starts at a height 0.60 m on a plane that has an angle of 30 degrees from the horizontal. Upon reaching the bottom, the block slides along a horizontal surface. If the coefficient of friction on both surfaces is 0.20, how far does the block slide on the horizontal surface...
Hi all,
I am having difficulty with a question. I would like some guidance.
QUESTION:
A block rests on a frictionless horizontal surface and is attached to a spring. When set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 9.5 rad/s. The drawing...
A small block of mass 0.91 kg slides without friction on a horizontal table. Initially it moves in a circle of radius r0 = 0.63 m with a speed 1.5 m/s. It is held in its path by a string that passes through a small hole at the center of the circle. The string is then pulled down a distance of r0...
the equation is:
x^2 + xy + y^2 = 25
my method was to implicitely differentiate and then set the numerator = 0 to get points of horizontal asymptotes, and then set the denominator = 0 to get the points for the veritcal asymptotes.
when i use implicit differentiation i get:
y' = (-2x...
I need help with this problem (my work is at the bottom):
http://img96.imageshack.us/img96/9823/physicsquestiondd9.jpg
Here is what I tried:
a_x from graph = 3 m/s^2
Fnetx = m* a_x
F_n_e_t_x = 3.9 N
F_n_e_t_x = -3 + F_2*\cos(\theta)
6.9 = 9.0*\cos(\theta)
\cos(\theta) = 0.7667
\theta =...
hi guys.. could you please explain why 2.0x10^1 meters is the answer of the horizontal distance between the log and the bridge when the stone is dropped from rest from a 75-m-high bridge and lands on the log as it passess under the bridge if the log moves with a constant speed of 50 meters per...
Two wires are tied to the 500 g sphere shown in figure.The sphere revolves in a horizontal circle at a constant speed of 8.40 m/s.
The two wires part of it is throwing me off.
I can do it if it was just one string or two strings if it isn't moving but I am not sure how to do it with circular...
The acceleration of a particle on a horizontal xy plane is given by a=3ti + 4tj, where a is in meters per second-squared and t is in sec. At t=0, the particle has the position vector r=(20.0m)i + (40.0m)j and the velocity vector
v=(5.00m/s)i +(2.00m/s)j. At t=4.00 s, what are its position...
Im studying for my test and I have a problem from my previous notes. It should be simple but I am having some difficulty.
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A cannon is shooting horizontally at a target. The cannonball strikes .2m below the bullseye. If the initial speed of the cannonball is 956m/s, what is the distance...
given the latitude and longitude of a place, how can you use the horizontal system of celestial coordinates to find the location of the north celestial pole from an observer standing on that place?
For me, it's quite hard to imagine the Earth as a sphere, if 2-dimension, it's fine for me...
Two blocks (M1 = 5kg and M2= 10kg) are pushed so that M1 is not touching the ground (in the air). The horizontal surface is frictionless but there is a friction between the two blocks (mu_k = .4 and mu_s = .5). Find the minimum force F needed so that M1 will remain "in the air" as the blocks...
A curve in a road forms part of a horizontal circle. As a car goes around it at constant speed 13.3 m/s, the total force on the car (due to friction with the road) has magnitude 127 N. If the driver would have been driving 16.8 m/s, what would the force have been instead?
∑F= mac = m* v^2/r...
A 100 kg crate is pushed at constant speed up the frictionless 27° ramp shown in the figure. What horizontal force F is required?
What force is exerted by the ramp on the crate?
I can't paste the figure up so I hope this question describes the scenario well enough.
What's giving me...
The horizontal beam in Fig. 11-25 weighs 170 N, and its center of gravity is at its center.
(a) Find the tension in the cable.
641.66 N
(b) Find the horizontal and vertical components of the force exerted on the beam at the wall.
513.33 N (to the right)
? N (upwards)
Any tips on...
http://img151.imageshack.us/img151/8411/physicsks7.jpg
http://www.glpics.com/cristianb/Pics/penguin%20physics.JPG
How would I go about solving this problem?
Do you just ignore the sled and snow friction?
Any help would be great.
A baseball hit at an angle of a to the horizontal with initial velocity v0 has horizontal range, R, given by
R = (v02 / g)sin(2a)
Here g is the acceleration due to gravity. Sketch R as a function of a for 0 < a < pi/2. What angle gives the maximum range? What is the maximum range...
The problem states; A projectile is fired horizontally with an initial speed of 50m/s. neglect air resistance. What is the magnitude of the displacement of the projectile 3 seconds after it is fired? What is the speed of the projectil 3 seconds after it is fired? I used this equation to get my X...
The question states; A projectile is fired at an angle of 60 degrees above the horizontal with an initial speed of 30.0m/s. How long does it take the projectile to reach the highest point in its trajectory? Ok so I was able to find the maximum point (34.44m) by finding the Y component...
ok, so i just had my exam 10 minutes ago and i can't think of anything else except this seemly easy problem that i couldn't get.
a football is kicked on the horizontal plane (ie. y_0 = 0 ) at some angle alpha, it covers a horizontal displacement of 100 ft 2.5 seconds later, find the initial...
Does anyone know where I can find the governing equations on the heat transfer of a horizontal, closed loop system?
e.g. http://www.eere.energy.gov/consumer/images/closed_loop_system_horiz.gif
I've tried searching online, and all I can find is the general overview, no equations :frown...
One end of a chord is attached to the ceiling at D and another to the wall at A. Masses of W kg and 20 kg are attached to the cord so that it assumes the shape shown on the right. Find W and the tension in each of AB, BC, and CD.
http://img126.imageshack.us/img126/9884/forces4zx.jpg
stuck on...