Kinematics Definition and 1000 Threads

Homework Statement An airplane travels at 885 km/h [W35S]. Wind blows against the plane with a velocity of 150 km/h [E55N]. What's the displacement with direction? Homework Equations v=v1^2+v2^2sqrtThe Attempt at a Solution

Homework Statement A ball is thrown down with an initial velocity of 2.0 m/s from a height of 1.75 m, determine how long until it hits the ground. initial velocity = 2 m/s distance = 1.75 m acceleration = 9.8 m/s2 time = ? Homework Equations d=vit+1/2a(t)2 The Attempt at a Solution 1.75=2t +...

Homework Statement [/B] Consider a half-atwood machine on a cart as below, with mass m_2 attached to M via a frictionless track that keeps it pinned to M but allows it to move vertically. All surfaces (except between the wheels/ground) are frictionless, and the pulley and rope are massless. If...

Hey guys, So, I'm new here. And I'm of 13 years of age. I am a programmer in a platform called "ROBLOX". I wanted to create my own Animator within that platform, using Inverse Kinematics. However, searching through the web, everything is just so complicated to me. I don't seem to understand the...

i have found out the second answer of the PHYSICS problem but unable to solve the first part.i tried all possible ways.:-( ---------------------------------------------- a test projectile is fired horizontally into a viscous liquid with a velocity Vo . The retarding force is proportional to the...

Homework Statement A tennis ball is struck such that it leaves the racket horizontally with a speed of 28.0 m/s. The ball hits the court at a horizontal distance of 19.6 m from the racket. What is the height of the tennis ball when it leaves the racket? Homework Equations v = vo + at x =...

Homework Statement This is a quiz question that was given in my AP physics C class. "A rock is launched upward with a speed V0. With what velocity must a second rock be launched from the same initial position at time T later so that it hits the first rock when it has a velocity of -V0/2."...

Homework Statement A sprinter can accelerate with constant acceleration for 3.00 s before reaching top speed. He can run the 100-meter dash in 10 s. What is his speed as he crosses the finish line? Homework Equations The Attempt at a Solution So I broken up the question into two parts, one...

So last year, I was told by a friend that no Acceleration means no Force, Mathematically, this makes sense (500 Kg * 0 m/s^2 = 0 N), but intuitively, I can't wrap my head around it. Maybe this is because of language and the way we use the word force in normal conversation, but in physics it is...

Homework Statement A ball moving westward at 36 m/s hits a wall and rebounds at 27 m/s, eastward. (a) What is the change Δv in the vector velocity? (This is effectively the velocity of the rebounding ball relative to an image of it passing through the wall unaffected. It’s not the same as the...

Homework Statement A cart is initially moving at 0.5 m/s along a track. The cart comes to rest after traveling 1 m. The experiment is repeated on the same track, but now the cart is initially moving at 1 m/s. How far does the cart travel before coming to rest.[/B]Homework Equations W=ΔKE[/B]...

One bullet was fired from Gun A and Gun B each at varying time interval. Both the guns are 10 meters above the ground. Calculate: a) Which gun was fired first. b) Displacement and time at which the two bullets will collide.

Homework Statement She drives for 40.0 min at 80.0 km/h, 10.0 min at 75.0 km/h, and 30.0 min at 45.0 km/h Determine the average speed for the trip The attempt at a solution I got 66.25khm by ((4*80)+(75)+(3*45))/8 which looks like its in the ballpark range but when I enter the answer for my...

1. Problem statement: an object moves along the x-axis so it's position at any given moment is x(t) = −t3(to the third power) + 6t − 12 m. a. what is it's velocity at any given moment b. what is it's acceleration c. at what moment does the object stopsHomework Equations s=vt+1/2at2 The Attempt...

Homework Statement A 25 kg Rocket generates 400 N of thrust. It is designed to burn its fuel for 40 seconds. If launched vertically what will its final vertical velocity be when the fuel runs out? How high can it fly? How long until it reaches the ground? Neglect mass of fuel, and air...

So let's say you're sitting on the ground (observer A) and there's a car or something that moves at .99c (observer B). (Of course, this is all hypothetical) Now, my interpretation goes that when A is seeing B, the information he gets is distorted, namely due to time dilation, length contraction...

I get these physics problems from Engineering Physics Course at my recent university, Bandung Institute of Technology, Indonesia. The questions are really simple but needs an advance and deep analysis to answer them. The system of answering the science problems here in my university is quite...

Homework Statement A juggler throws a bowling pin straight up in the air. After the pin leaves his hand and while it is in the air, which statement is true? (a) The velocity of the pin is always in the same direction as its acceleration. (b) The velocity of the pin is never in the same...

Homework Statement ) You are given the task of shooting a tennis ball from ground level through 2 hoops. The two hoops’ centers and the launch site are located in the same vertical plane, and the hoops are oriented perpendicular to the ball’s proposed trajectory and also in a vertical...

Consider the famous kinematics equations $$x_f=x_i+v_i\cdot t+\frac12at^2$$ My question is: does this equation work for every point A & B along the parabola formed when dropping an object?

Homework Statement Danielle bikes at a steady rate of 4.0 m/s south along the bank of a river. Summer is rowing her kayak heading south down the river; she can row at a constant rate of 2.0 m/s in still water. There is a 5.0 meter wide bridge that spans the river and the bike trail. a) If it...

Homework Statement For part c ii) of this question, the new distance is now 1/4 of the previous distance as both acceleration are the same. But why are both the acceleration the same? Homework Equations v^2= u^2 +2as The Attempt at a Solution I know that the method is by using the above...

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 3.1 m/s2 for 3.7 seconds. It then continues at a constant speed for 12.5 seconds, before applying the brakes such that the car’s speed decreases...

Homework Statement A 30 degree inline sits on a 1.1 meter high table. A ball rolls of the incline with a velocity of 2m/s. How far does the ball travel acoss the room before reaching the floor?Homework Equations deltax= vot + 1/2at^2[/B] The Attempt at a Solution...

Homework Statement A hot-air balloon is rising upward with a constant speed of 2.20 m/s. When the balloon is 3.30 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground? Homework EquationsThe...

Homework Statement A peaked roof is symmetrical and subtends a right angle, as shown. Standing at a height of distance h below the peak, with what initial speed must a ball be thrown so that it just clears the peak and hits the other side of the roof at the same height? Diagram...

So the first question is: A student standing on the platform of a railway station notices the first two carriages of an arriving train pass her in 2.0 s and the next two in 2.4 s. The train is decelerating uniformly. Each carriage is 20 m long. When the train stops, the student is opposite the...

Question 1: 1. Homework Statement A bug of mass m crawls radially outwards with a constant speed v’ on a disc that rotates with a constant angular velocity ω about a vertical axis. The speed v’ is relative to the center of the disc. Assume a coefficient of static friction μ, find out where on...

Homework Statement A ball of mass 65 g is thrown vertically upwards from ground level with a speed of 16 m s–1. Air resistance is negligible. The ball takes time t to reach maximum height. For time t 2 after the ball has been thrown, calculate the ratio of the potential energy of ball to the...

Homework Statement Block C is moving with a velocity v0 and block A and B are moving with velocities v1 and v2 with respect to block C. Find the relation between v0, v1 and v2 Homework Equations none The Attempt at a Solution Since the string is in-extensible, its velocity at both ends...

Homework Statement I stumbled upon a problem and i can't establish the ODE to solve it, from there on i believe i can solve the ODEs if they have regular analytical solving methods (translated from Spanish, will sound a bit weird) Car race, 2 pilots (a and b) participate in a drag race. They...

Homework Statement The magnitude of the velocity of a projectile when it is at its maximum height above ground level is 14 m/s. (a) What is the magnitude of the velocity of the projectile 1.2 s before it achieves its maximum height? (b) What is the magnitude of the velocity of the projectile...

Homework Statement A parachutist bails out and freely falls 59 m. Then the parachute opens, and thereafter she decelerates at 2.7 m/s2. She reaches the ground with a speed of 3.1 m/s. (a) How long is the parachutist in the air? (b) At what height does the fall begin? Homework Equations...

Homework Statement In the figure here, a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 223 m. If the red car has a constant velocity of 20.0 km/h, the cars pass each other at x =...

Homework Statement In the figure here, a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 223 m. If the red car has a constant velocity of 20.0 km/h, the cars pass each other at x =...

Homework Statement You drive on Interstate 10 from San Antonio to Houston, half the time at 58 km/h and the other half at 103 km/h. On the way back you travel half the distance at 58 km/h and the other half at 103 km/h. What is your average speed (a) from San Antonio to Houston, (b) from...

Homework Statement Calculate the average velocity after 11 s. Homework Equations v=d/t The Attempt at a Solution I need to find the total displacement to find average velocity. I assumed the displacement was -4 as the graph goes up then back down to 0 then -4 so total is just -4. Is that a...

Homework Statement A pilot is flying from City A to City B which is 300 km [NW]. If the plane will encounter a constant wind of 80 km/h from the north and the schedule insists that he complete his trip in 0.75 h, what air speed and heading should the plane have? Homework Equations v=d/t The...

Homework Statement : The trajectort of two projectiles are shown in the figure. Let T1 & T2 be the rime periods and U1 and U2 be their speeds of projection. Then(state the answer with REASON): A) T2 > T1 B) T1 = T2 C) U1 > U2 D) U1 < U2 [/B] (MAYBE, MORE THAN ONE CORRECT) Homework Equations...

Homework Statement : The trajectory of a projectile in a vertical plane is y = √3 x - (1/5)x2, where x and y are respectively horizontal and vertical distances of the projectile from the point of projection. Find the angle of projection and speed of projection.[/B]Homework Equations ...

Homework Statement : Question 1: A body is projected with speed u at an angle theta with the horizontal. Find the change in velocity in time t. Question 2: A body is projected with speed u at an angle theta with the horizontal. Find the speed of body at a height h. Both the questions are...

Homework Statement : A body is projected with 50m/sec at an angle of 53 degree with the horizontal. After what time velocity makes an angle 33.7 degree with horizontal. (tan 33.7 = 2/3)[/B] Homework Equations : Mostly from 2-Dimension and maybe calculus.[/B]The Attempt at a Solution : I've...

Homework Statement In the arrangement as shown in the figure below, the ends P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. Mass M moves upward with a speed: a. 2ucosθ b. u/cosθ c. 2u/cosθ d. ucosθ Homework Equations None, I am not sure...

Homework Statement I was wondering that, if you are standing above a bridge with a height h and throw a rock in your hand with mass m and initial velocity v naught of 0, could you calculate how big of a splash said rock makes when it hits the water? Homework Equations Not sure, I'm guessing...

Homework Statement http://imgur.com/BPPbwpu Homework Equations s = ((v + u)*t)/2 - an equation of motion for constant acceleration, which is applicable in this situation. The Attempt at a Solution Let u be the velocity at which the projectile was launched. It is given that sx = symax. So...

Homework Statement [/B] A boy drops a 0.10 kg stone down a 150 m well and listens for the echo. If the speed of sound is 343 degrees Celsius, the how long after the stone is dropped will the boy hear the echo? Homework Equations v = d/t v2 = v2 + 2ax The Attempt at a Solution [/B] What I...

I'm a junior in physics, and I had a really embarrassing experience lately with some freshmen. Basically, within the major I have earned straight A's in all my physics courses since freshman year, I'm the student body president of the physics majors, and I'm doing a summer REU at one of the...

So, you'll have to forgive me, but I am an engineer, not a physicist, but I take an interest in quantum gravity. My understanding is primarily conceptual, not mathematical. So if my question is dumb, I apologize. Ok, here goes: I'm aware of Zwi Bern's conjectured color-kinematics duality...

Homework Statement A person is standing over a well and drops a rock. After 2.4 seconds he hears a rock splashing into the water. Take the speed of sound to be 300m/s and calculate the depth of the well. Homework Equations x=v/t for constant velocity x=1/2at^2 for accelerated motion The...

Homework Statement L=18ft , theta-dot=8rpm or .83776 rad/s, omega = 1 rad/s, fi-0=70.5 and fi-1=24 Homework Equations - 3D motion[/B]The Attempt at a Solution I have come up with a ton of different answet inbetween 12-18 ft/s^2. Non have been correct[/B]