Height Definition and 1000 Threads

How to determine the right height of the desk for you? Or does it not matter if the height of the chair can be adjusted?

Hey I wondered what the best way to proceed about fiding the maximum length of a projectile when fired at an angle relative to an incline. Would a coordinate axis along the incline be the best choice? Then I could solve the equations for when y = 0, but it would also result in an acceleration in...

How would i calculate the change of flow rate when i have the intial rate, the length, and diameter of tubing ? Say I get an initial flow of 100gph and the tubing the water travels through is .5inch diameter and 16 inches long. What is the flow at the end of the tubing? Could I also calculate...

Homework Statement A model rocket initially at rest on the ground is fired vertically upward, and the engine thrust produces a constant acceleration a = 40 m/s2. After running for 2.5 s the engine is cut off and then the rocket is in free fall. (a) Find the maximum height that the rocket...

Homework Statement A ball is projected horizontally from the edge of a table that is 1.02 m high, and it strikes the floor at a point 1.28 m from the base of the table. What is the initial speed of the ball? Correct, computer gets: 2.81e+00 m/s How high is the ball above the floor...

Homework Statement A 151 -tall diver is standing completely submerged on the bottom of a swimming pool full of water. You are sitting on the end of the diving board, almost directly over her. How tall does the diver appear to be? Homework Equations n1sin theta1= n2 sin theta2 ?? The Attempt...

Homework Statement Ball A is dropped from the top of a building of height 'h' at the same instant that Ball B is thrown vertically upward from the ground. When the balls collide, they are moving in opposite directions, and the speed of A is twice the speed of B. At what height does the...

Calculate change in height? I am working on a ballistic pendulum physics labs. I am trying to find the change in y(height) and bullet velocity. I ran the lab and received the following results: t (at max height (.780) in y= -.984 final y= -789 m(bullet)=.001 m(block)=.05 g=9.81 x in=...

Homework Statement An object is thrown vertically upward such that it has a speed of 47 m/s when it reaches two thirds of its maximum height above launch point. Find maximum height h. Homework Equations V^2-Vo^2 = 2gh or V^2-Vo^2 = 2g(1/3H)? The Attempt at a Solution Final...

Homework Statement I have to find the orbital height of a satellite with a specific g force (ie. the acceleration due to gravity). g=5.7(ms)2 Homework Equations So far I have been using the equation g=Gm/(r+h)2 to find the acceleration due to gravity, where G= gravitational...

Hi..A disk A and disk b are rolling without slipping with same speed on a horizonal surface..Disc a rolls up an incline and disk b rolls up an incline except that it is fricitionless! Which disk attains more height nw why?

Homework Statement Projectile A is launched horizontally at a speed of 20. meters per second from the top of a cliff and strikes a level surface below, 3.0 seconds later. Projectile B is launched horizontally from the same location at a speed of 30. meters per second. Approximately how...

Homework Statement Hello! I am an honors physics student and i have been assigned a project that has puzzled me. I have a container full of sand, a couple meter sticks, a tennis ball, and a stopwatch. What I need to do is prove something through the use of these items. What I am going to try...

Homework Statement From my astronomy textbook: "The photograph that opens this chapter was taken next to the Gemini North Observatory atop Mauna Kea in in Hawaii. The telescope is at longitude 155 28' 09" west and latitude 19 49' 26" north. a) By making measurements on the photograph, find...

Homework Statement A 32 kg cannon ball is fired from a cannon with muzzle speed of 1360 m/s at an angle of 44◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the total mechanical energy at the maximum height of the ball? Answer in units of J. Homework Equations...

Hello guys! I need your help regarding Projectile Motion because I kinda novice here. I don't know where to start. These are the following given: Vi = 23.2 miles/hour h = ? x = 1 km Here's the situation it looks like, check this image that I created for you to understand...

Hello fellow physicists, I am seeking help on the following problem: A bicycle is moving over a speed bump at 6.9m/s. Calculate the height reached by the bicycle once it looses contact with the speed bump. Radius of the speed bump is 1.7m and mass of the bicycle is 83 kg. For this problem...

Homework Statement An entertainer juggles balls while doing other activities. In one act, she throws a ball vertically upward, and while it is in the air, she runs to and from a table 5.60 m away at a constant speed of 2.10 m, returning just in time to catch the falling ball. Homework...

I have been toiling over this for the last three weeks. I am programming a tank to fire at a target. The target can be all over the landscape up, down left right. Currently I have the turret turn to face the target turning the problem into a 2d equation. So I need help finding the right equation...

Homework Statement What is the effect of increasing the height of the track on the acceleration of the object? Homework Equations The Attempt at a Solution The speed of the track was slower? is it correcT?thanks

So if you have a typical basketball "mens". http://en.wikipedia.org/wiki/Basketball_(ball ) so, my friends and I were in a hot tub and one brought in a basketball. They were pulling the basketball to the bottom of the hot tub and we noticed that it did not shoot out as high as when we...

Hi, everybody, I really hope you can help me out with this one. I work for an outdoor facility, and we were just replacing our zip cable. Due to major safty issues, we need to get it at the exact height it used to be at, and that's kind of tough. After a few trial-error sessions, we...

Homework Statement I have this problem on my physics exam and I hoped you guys could help. The Question is: Why is the relationship between the average velocity and the height of a ball rolling down a slope a square root function? The slope is 100cm long, the height of the ball at the top of...

Homework Statement Little Willy, clumsy clot, From window sill dislodged a pot. He shouts below to Little Milly: "Step aside, it'll knock you silly!" The window sill is 35.0 m above the sidewalk where Millly is standing directly below the falling pot. Milly is 1.05 m tall, her ears...

http://home.cc.umanitoba.ca/~loly/102-dec_word.pdf The above is a link to the problem - Question #3. Homework Statement A glass tube has several different cross-sectional areas with the values indicated in the figure. A piston at the left end of the tube exerts pressure so that the mercury...

Homework Statement A child and sled with a combined mass of 50.0 kg slide down a frictionless hill. If the sled starts from rest and has a speed of 12.0 m/s at the bottom, what is the height of the hill? Homework Equations KE = 1/2 m v^2 PE = mgh The Attempt at a Solution KE = 1/2...

you are standing on top of your snow fort, defending yourself from a horde of evil attackers. if you hurl a 2.1 kg slush ball at an angle of 35 degrees from the horizontal, and a velocity of 15 m/s, how far will it travel before it hits the ground? assume you launch it from a height of 1.6 m...

Homework Statement Heights of volcanoes. You can assume that the density of basaltic magma is 2750 kgm-3, the density of lithospheric mantle is 3270 kgm-3, the density of oceanic crust is 2800 kgm-3, the density of seawater is 1030 kgm-3, and the depth of the ocean is 5 km. A)What is the...

Homework Statement 79kg person jumps from a platform that is 100m above the water. He is attached by a bungee chord with sprint constant 40 N/m and length 35 m. Now he jumps off. How far is he above the water now when the chord has reached maximum elongation Homework Equations F=ma...

Homework Statement Let y be the the solution of the initial value problem. The maximum value of y is? y" + y = -sin(2x) y(0) = 0 y'(0) = 0 Homework Equations N/A The Attempt at a Solution Factor out original equation to find general equation. r2 + 1 = 0 r = 0 + i; 0- i Thus...

Good day, I have a homework problem I'd like help with. I got into getting the impulse (not sure if correct, though), but don't really know how to get the rest of the things. Any tips on what direction I should be going are appreciated. Homework Statement Starting from rest, 65kg athlete...

Homework Statement A helium filled balloon is tied to a 2.00-m-long, 0.050 0-kg uniform string. The balloon is spherical with a radius of 0.400 m. When released, it lifts a length h of string and then remains in equilibrium as shown in figure P14.51. Determine the value of h. The envelope of...

[b]1. A model rocket with a mass of 4.3kg is launched straight up at a speed of 65m/s. Kinetic energy when it takes off is 9083.75 J. Total energy when it takes off is also 9083.75J. When the rocket reaches its maximum height, what is its kinetic energy? [b]2. KE(kinetic energy)=1/2MV^2...

Homework Statement Radio waves from a star, of wavelength 231 m, reach a radio telescope by two separate paths. One is a direct path to the receiver, which is situated on the edge of a cliff by the ocean. The second is by reflection off the water. The first minimum of destructive...

Homework Statement A hydraulic lift has two connected pistons with cross-sectional areas 25 cm2 and 250 cm2. It is filled with oil of density 510 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1200 kg at equal fluid levels? I got this answer - 120 kg...

Homework Statement What is the maximum height that the body reaches when thrown vertically upwards from the surface of the Earth at a velocity of 5km/s, if we neglect the impact of the atmosphere? The radius of the Earth is r= 6400km; the acceleration of gravity on the surface is g = 10...

Homework Statement Given your assigned projectile launcher determine the muzzle velocity. angle of launcher = 45degrees distance to bottom of barrel = 25.6 cm distance traveled when fired = 119.2cm Ignore Air resistance Homework Equations I don't know where to start since I have...

Hello! My question is...What is the maximum height obtained by a 125 g apple that is slung from a slingshot at an angle of 78 degrees from the horizontal with an initial velocity of 18 m/s? Thanks!

A 0.300kg baseball has a velocity of magnitude 12.0m/s and angle 35 degrees. The ball collides with the bat with a velocity of 10m/s with a collision of 2.00millmeters/second. (a) What are the magnitude and directions (relative to the positive direction of the x axis) of the impulse on the...

Problem: An 8 m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is .45, and the ladder makes a 60 degree angle with the ground. How far up can an 800 N person climb before the ladder begins to slip? a. 7.8 m b. 6.8 m c. 5.8...

Homework Statement A ball having mass 1.2 kg is connected by a string of length 1.6 m to a pivot point and held in place in a vertical position. A constant wind force of magnitude 23 N blows from left to right.If the mass is released from the vertical po- sition, what maximum height...

Homework Statement A block of mass 20 g sits at rest on a plate that is at the top of the fluid on one side of a U-tube as shown below. The U-tube contains two different fluids with densities ρ1 = 1090 kg/m3 and ρ2 = 595 kg/m3 and has a cross sectional area A = 4.7 10-4 m2. The surfaces are...

I could use some help starting and solving this problem. It is due tonight. Any help would be appreciated. A 190 ball is dropped from a height of 1.8 and bounces on a hard floor. The force on the ball from the floor is shown in the figure (use the link). How high does the ball rebound...

1. A container of uniform cross-sectional area A is filled with liquid of uniform density rho. Consider a thin horizontal layer of liquid (thickness dy) at a height y as measured from the bottom of the container. Let the pressure exerted upward on the bottom of the layer be p and the pressure...

Homework Statement Mass of person jumping off bridge = 60 kg The bridge is 60m above the river The cord only starts stretching after he falls 20m. k = 50 N/m Homework Equations gravitational potential energy = mgh elastic potential energy = (1/2)kx^2 The Attempt at a Solution...

Homework Statement A bale is 0.25 m wide, 0.50 m high, and 0.80 m long, with mass 30.0 kg. The center of gravity of each bale is at its geometrical center. It is dragged along a horizontal surface with constant speed by a force \vec{F}. The coefficient of kinetic friction is 0.35. A) Find...

Homework Statement Gravitational roller coaster makes a circular loop of radius 8 m. - What should the minimum height be for the roller coaster to make the loop without falling at the top? - What is the velocity of the cart in the point B, after it finishes the loop? (See picture) - What is...

Homework Statement Consider the earth’s atmosphere assuming it is a mixture containing 79% N2 and 21% O2 gas. Furthermore, assume that the atmosphere is at an average constant temperature of 10o Celsius and that the acceleration due to gravity is g = 9.81 ms-2. Using the barometric height...

Homework Statement "A golfer can hit a golf ball a horizontal distance of over 300m on a good drive. What maximum height will a 301.5m drive reach if it is launched at an angle of 25 degrees to the ground? Here's a second problem I got right: "A quarterback throws the football to a stationary...

Homework Statement Consider a frictionless track. Imagine point A to B is one quarter of a circle; point B to C is a horizontal flat plane; point C to D is also one quarter of a circle. The block m1 is released from A. It makes a head-on elastic collision at B with m2 (that is initially...