Height Definition and 1000 Threads

1. A person drops a ball from the top of a building; 1 second later, a second ball is thrown straight up from the bottom of the same building. The ball that is thrown upwards has just the necessary speed to just make it to the top of the building. As the balls pass each other, they have the...

Homework Statement For my lab, I need to calculate the height of the ring stands so the projectile can pass through them; as well as the angle the projectile will come at them. I have calculated/measured the following things: Muzzle Velocity: 4.11m/s Vix= 4.02m/s Viy= 0.85m/s Delta Y: 0.87...

[FONT="Century Gothic"]The image distance is 144cm, the object distance is 36cm, and the image height is -96cm. I need to find the object's height. hi / ho = -di / do -96 / ho = -144 / 36 But now I am unsure of how to bring the -96 over to the other side to have the object's height isolated...

Homework Statement A 10' ladderis leaning against a house when its base starts to slide away By the time the base is 6' fromthe house, the base is moving away at a rate of 16 ft/sec a)What is the rate of change of the height of the top of the ladder? b)At what rate is the area of...

Homework Statement A mass of 100kg is h meters high on a track that extends into a loop that has a radius of 20m. Assume track is frictionless. I need to find minimum height for the mass to make it around the loop without falling off or going backwards. Homework Equations Conservation...

Hi, we can determine the velocity to hit x and y point with angle of projection given. but can we do the same if the initial height of projection is given?

Homework Statement The Sun is presently about 20 pc out of the midplane of the disk, and moving away from the midplane at about 7.4 km s−1. Using these as the current position, z(tnow), and velocity, vz(tnow), what is the maximum height zmax (in pc) the Sun will reach before turning around...

Homework Statement A ball is thrown straight upward and returns to the thrower’s hand after 1.54 s in the air. A second ball is thrown at an angle of 30.0◦ with the horizontal. The acceleration of gravity is 9.81 m/s2 . At what speed must the second ball be thrown so that it reaches the same...

Homework Statement Amplified Rebound Height Two small rubber balls are dropped from rest at a height h above a hard floor. When the balls are released, the lighter ball (with mass m) is directly above the heavier ball (with mass M). Assume the heavier ball reaches the floor first and bounces...

I'm trying to determine change in height using my angle that I determined to be 3.11 degrees and the distance traveled by cart which is 0.797 m. I multiplied 0.797 by Sin 3.11 to find the height but I have no idea if that is right. Any help would be appreciated since we didn't go through this in...

A bouncy ball of mass 85.3 grams is dropped from a height of 13.17 meters. It rebound to a height of 5.12 meters. What was the change in momentum (in kgm/s) of the bouncy ball?

a cannon is placed on an edge of a cliff and launches shell with an initial velocity of 710m/s [35degrees above the horizontal]. the shell lands 15m below its launching position. a) determine the max height of the shell b) determine the horizontal range of the shell from the base of the cliff...

Homework Statement A. 04 kg bead slides on a curved frictionless wire, starting from rest at point A. At point B, the bead collides elastically with a 0.6-kg ball at rest. Find the height that the ball moves up the wire. The answer is .96 m. Homework Equations m1v1i + m2v2i=m1v1f + m2v2f...

Homework Statement Newton's model of the tidal height, using two wells dug to the center of Earth (one from the North pole, one from the equator on the side of Earth facing away from the Moon), used the fact that the pressure at the bottom of the two wells should be the same. Assume water is...

I need to calculate the maximum height above sea level of a projectile. I already have the values for the initial velocity, the angle and the time of flight, and I have the following equation to calculate the y-component of the displacement from the launch point...

Homework Statement 1. A ball is thrown upward. After reaching a maximum height, it continues falling back toward Earth. On the way down, the ball is caught at the same height at which it was thrown upward. If the time (up and down) the ball remains in the air is 2.1 s, find its speed when it...

Two objects with masses 6.00 kg and 2.40 kg hang 0.500 m above the floor from the ends of a cord 5.30m mlong passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.40kg object.

Homework Statement A poorly designed playground slide begins with a straight section and ends with a circular arc as shown in the figure below. [PLAIN]http://img716.imageshack.us/img716/8381/25746193.jpg A child starts at point P and slides down both sections of the slide. At some point on...

Homework Statement A gun can fire shells in any direction with the same speed v0. Ignoring air resistance and using cylindrical polar coordinates with the gun at the origin and z measure vertically up, show that the gun can hit any object inside the surface z = \frac{v_{0}^{2}}{2g} -...

Homework Statement Suppose there is a Conical section (of a right circular cone) of total height 'l' and radii 'a' and 'b' (a>b). How do we derive the formula for the radius at a height 'h' (h<l) ?Homework Equations The Attempt at a Solution

1. A ball is thrown with a velocity of 20m/s at an angle of 30 degrees and travels 3.0s before hitting the ground. What is the maximum height of the ball? 2. I really am new to physics and have am not sure about the relevant equation. I do want to learn and don't want my work done for me...

So when thinking of a photon, we (at least I do) think of the picture, where is it shown as having literal height and width, but I know or at least I think I know, that the lines just represent the intensity/ strength of the E and M part of the wave, not the actual shape of the photon. And it...

Homework Statement A hot air balloonist forgot to calibrate his altimeter before taking off. The altimeter displays his height as A*h (A being a constant multiplcator, and h is his real height). He does not know A, nor does he know the speed of sound. How can he find his height with just two...

Problem solved! Thanks again Thaakisfox! Homework Statement A ball thrown horizontally at 2.2 m/s from the roof of a building lands 36 m from the base of the building. Calculate the height of the building. Vox = 2.2 m/s Xo = 0m Vx = 0 m/s X = 36m Homework Equations y = Vosin ao - (0.5)(g)(t^2)...

A baseball player wants to hit a home run over the far wall of a stadium. He hits the ball 1 meter above the ground so that its speed is 38.2 m/s and such that it makes an angle of 30 degrees with respect to the horizontal. What is the tallest wall the players ball can clear 120m away...

Homework Statement A firefighter, 44.0 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 31.2° above the horizontal. If the speed of the stream as it leaves the hose is 40.0 m/s, at what height will the stream of water strike the building...

Thermodynamics A rock of mass 0.19 kg falls from rest from a height of 15 m into a pail containing 0.37 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1885 J/(kg·C°). Ignore the heat absorbed by the pail itself, and determine the...

Homework Statement An alert hiker sees a boulder fall from the top of a distant cliff and notes that it takes 1.3s for the boulder to fall the last 3rd of the way to the ground. Ignore air resistance.a) what is the height of the cliff in meters? b) If in part a) you get 2 solutions what does...

Homework Statement Part 1. Fleas can jump 140times their own height. They jump so they land a max distance of 20.80cm away. What is their take off speed? I got this part right already, got 1.43m/s what I really need help with is part 2... Part 2. What is the flea's height? Homework...

Homework Statement An object of mass .5 kg is hung from the end of a steel wire 2m in length and .5mm in diameter. The mass is lifted a distance h and then dropped (creating a 'jerk') What is the largest value of h if you don't want the wire to break? Ultimate Strength: 1.1E9 N/m^2 Young's...

Homework Statement A ball is thrown vertically up from y=0 at time t=0 with vinitial=v0j. Show that the time it takes for the ball to reach the ground is twice the time it takes to reach its maximum height. Homework Equations h=(vi2sinthetai)/2g R=(vi2sin2thetai)/g The Attempt at...

Express Max height in terms of g and T?!? I need to express the y_max in terms of g and T... do i need to put in my V_0y value? or leave it as a variable? i've tried V_0y*T + 1/2gT^2

Homework Statement A ball is thrown upward in such a way that its speed is 32.3 m/s when it is at half its maximum height. Find (a) its maximum height, (b) its velocity 2.0 s after it's thrown, (c) its height 2.0 s after it's thrown, and (d) its acceleration at its maximum height...

Homework Statement Ball A is dropped from the top of a building of height h at the same time 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 collision...

hi physics forum i am having a issue related to a tank size based on the flow rate and the diameter of the orifice. the dimensions would be the total height of the setup should be 1000mm the flow rate should be 525+/- 25ml/min the Internal diameter of the orifice is 4.3mm what would be...

Would a ball dropped vs launched(horizontally) have the same force of impact? (same starting height) I can't wrap my mind around this... I know there's no acceleration in the x-direction, yet I would imagine the launched object would have a greater force of impact. (negating the ball rolling...

Homework Statement 13. A box of mass m is released from rest at point A, the top of a long, frictionless slide. Point A is at height H above the level of points B and C. Although the slide is frictionless, the horizontal surface from point B to point C is not. The coefficient of kinetic...

According to my knowledge, I am able to apply Newton's second law on an egg for an egg drop; the resulted force from that can would be the force which occurs when it hits the ground. That force would also be reflected when it hits the ground according to Newton's third law. What is confusing...

Homework Statement A canon ball is fired from a canon upwards at an angle above the horizontal. a. Sketch a graph showing the height of this canon ball over time if it was fired at 30°, 45° and 60° above the horizontal. b. Sketch showing the acceleration of the canon ball over time if it was...

Hello all, I recently made some model rockets and thought it would be fun to predict their height before setting them off this weekend. I thought it would also be interesting to compare the difference in the predictions of a model with no drag and a model with quadratic drag. Surprisingly...

Homework Statement a cart slides down an iced incline that is 159m high. initial speed is 0m/s acceleration of gravity is 9.8 m/s^2 neglect friction, air resistance determine carts speed at the bottom of the hill Homework Equations v = u + at, but no time is mentioned v^2 = u^2 + 2ah...

Hi, how does an adjustable chair/microscope work? I need to make an adjustable height box, and I need some basic understanding of the design. -Gary

Homework Statement A daredevil on a motorcycle leaves the end of a ramp with a speed of 39.0 m/s as in the figure below. If his speed is 36.7 m/s when he reaches the peak of the path, what is the maximum height in meters that he reaches? Ignore friction and air resistance. Homework...

Homework Statement Consider a frictionless roller coaster. The acceleration due to gravity is 9.8 ms-2. Passenger cars start at point A with zero initial speed, accelerate as they go down to a point B, swing around the vertical circular loop B-C-B of radius 15m, then go on towards further...

An ant is trying to climb out of a semi spherical bowl that has a radius of 10cm. The static coefficient is .03. How high can the ant reach before it slides back down to the center of the bowl.

Homework Statement A projectile is fired across a horizontal flat plane. Its initial velocity is 25.5 m/s and is fired at an angle of 31.8° above the horizontal (a) How long does it take to get to the maximum height? (b) What is the maximum height? (c) Determine the horizontal and...

Homework Statement Ok, so pretty much, I built an air cannon for my physics assignment. I need to determine the muzzle velocity. I know the angle of the barrel, the height of the muzzle about the ground and the distance the projectile covered. I fired projectile at multiple pressures in order...

ok I am trying to find out how to work out the intial velocity of a projectile dropped from a height h and reaches a distance s. say a ball thrown from a height of 2.8 metres and reaches a distance of 3 metres. I want to be able to work it out WITHOUT having to work out the time. so...

1. A third baseman makes a throw to first base 38.6 m away. The ball leaves his hand with a speed of 38.0 m/s at a height of 1.4 m from the ground and making an angle of 24.2 degrees with the horizontal. How high will the ball be when it gets to first base? 2. d=V0(t) + 1/2(g)(t^2)...

Projectile Motion - V0 is 5 times v @ max height?!? Thanks prior, all... Homework Statement A projectile's launch speed is 5 times its speed at maximum heigth. Find launch angle theta0. Homework Equations Not sure which are relevant on this one, but the given for the section are...