Kinematics Definition and 1000 Threads

Homework Statement A brick is thrown upward from the top of a building at an angle of 23.8 degrees above the horizontal and with an initial speed of a 14.2 m/s. Acceleration of gravity is 9.8 m/s/s. If the brick is in flight for 3.3 s how tall is the building? Homework Equations...

Hi, I am new to Physics. I'm having trouble solving these word problems. For the third question I need to find the time first and then the initial velocity? 1. A young girl gives her toboggan a push of 4.0 m/s up a hill. It slides up the hill slowing down at an acceleration of 8.0 m/s2...

Homework Statement A rocket is initially at rest on the ground. At time = 0, its engines ignite causing the rocket to move in a straight line with constant total acceleration of a = 30 m/s^2 at an angle of 76 degrees, and the engines are strong enough to counter gravity and keep it exactly in a...

Homework Statement http://puu.sh/c0mFR/515cf5fd15.png Homework Equations ds/dt=dv The Attempt at a Solution I think answer is C by observation. Is it correct? if not what is the answer[/B]

Here's the question: Three particles A, B and C are situated at the vertices of an equilateral triangle ABC of side d at time t = 0. Each of the particles moves with constant speed v. The particle at A always has its velocity along AB, B along BC and C along CA. At what time will the particles...

Homework Statement A dog sees a rabbit running in a straight line across an open field and gives chase. In a rectangular coordinate system (L,0), assume: (i) The rabbit is at the origin and the dog is at the point at the instant the dog first sees the rabbit. (ii) The rabbit runs up the...

Homework Statement Suppose a can, after an initial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleration. A) It will travel at constant velocity with zero acceleration. B) It will have a constant acceleration up the hill, but a different constant acceleration...

Homework Statement Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between them A) increases. [<-- Correct Answer] B) remains constant. C) decreases. D) cannot be determined from the information given...

Homework Statement An old fox resting near a road sees a mouse that is traveling at a speed of 1.3 km/h. At the moment the fox sees the mouse , it starts chasing after it . The fox's acceleration is 0.45 m/s^2. a) how much time is elapsed between when the fox start's to when the mouse is...

Homework Statement The height of a helicopter above the ground is given by h = 3.30t3, where h is in meters and t is in seconds. After 1.80 s, the helicopter releases a small mailbag. Assume the upward direction is positive and the downward direction is negative. Already solved for Initial...

1. The problem statement, all You drive on Interstate 10 from San Antonio to Houston, half the time at 65 km/h and the other half at 117 km/h. On the way back you travel half thedistance at 65 km/h and the other half at 117 km/h. What is your average speed (a) from San Antonio to Houston, (b)...

Hello All, A lot of you are probably physics majors so this question will sound dumb to you, but I am just in A.P. Physics 1 in high school... we are learning projectile motion and the teacher is not the best at explaining it. We had our first test a few days ago, everyone bombed it, and he...

I'm struggling to do this problem. "When Babe Ruth hit a homer over the 7.0m -high right-field fence 120m from home plate, roughly what was the minimum speed of the ball when it left the bat? Assume the ball was hit 1.0m above the ground and its path initially made a 30∘ angle with the ground."...

Homework Statement An indestructible bullet 2.10cm long is fired straight through a board that is 11.7cm thick. The bullet strikes the board with a speed of 416m/s and emerges with a speed of 296m/s.Homework Equations What is the total time that the bullet is in contact with the board? What...

Homework Statement In the figure, a ball is thrown leftward from the left edge of the roof, at height h above the ground. The ball hits the ground 1.07 s. later, at distance d = 27.5 m from the building and at angle θ = 67° with the horizontal. (a) Find h (b) What is the velocity at...

Homework Statement My problem is I don't understand what my professor wants us to do instead. He says that we don't need to memorize any equations, namely the equations of motion, and that everything can be solved with basic principles and integration. The problem is, I have no idea how to...

Homework Statement The acceleration of a particular car during braking has magnitude bt, where t is the time in seconds from the instant the car begins braking, and b = 1.5m/s3. If the car has an initial speed of 45m/s , how far does it travel before it stops? Homework Equations There are...

I'm posting this because I disagree with the answer. Here's the question. You are in a train that is traveling at $3.0$ m/s along a straight horizontal railroad. Very close and parallel to the railroad there exists a wall with upwards inclination of $12^{\circ}$ with the horizontal. Looking...

Homework Statement time = 1 seconds, 2 seconds, 3 seconds, 4 seconds, 5 seconds acceleration due to gravity = -9.8 m/s^2 Max. Height = 3 meters Homework Equations d = vit + 1/2at^2 v = d/t The Attempt at a Solution I actually have to create values myself, so that the as the...

Quick question about translating what's on the Velocity vs Time graph into what is actually happening to the object. A cart is traveling on a straight horizontal track. So I determined that east is positive direction. So, if the velocity vs time graph is showing a negative slope of -0.2 does...

I want to derive some equations for a 2-D airplane's motion, specifically when it lifts off and lands. Can someone show me where I can start and how I can use differential equations to develop equations like the speed/position of the airplane in its x and y components? Also, if anyone is...

Here's the problem. A point traversed half a circle of radius $R = 160 \text{ cm}$ during a time interval of $\tau = 10.0 \text{ s}$. Calculate the following quantities averaged over that time: (a) the mean velocity $\langle v \rangle$; (b) the modulus of the mean velocity $ |\langle {\mathbf...

I was given this worksheet from my teacher and well I am finding it really tough so far .. the question below is just crushing my skull .. so i would appreciate it if you guys would guide me through it "A particle projected from ground takes time 't1' to reach 15/16 H and time 't2' to cover...

Homework Statement 4 ants are arranged in such a way that they make up vertex of a regular tetrahedron, of side length 1m . The ants are named Calvin , Peter , David and Aron. Each ant moves at a speed 1m/s , and moves in such a way that: Calvin moves toward Peter, Peter moves toward...

Homework Statement Two trains, one traveling 60.0mph east and the other traveling 90.0mph west, are on the same track. When they are 10000 ft apart both train's brakes are applied. If they both have the same deceleration, what is the minimum deceleration to prevent a collision? Homework...

For anyone interested in quickly gaining a basic understanding of kinematics principles, here's a list of 15 top videos. Enjoy! 1. Position, velocity, acceleration 2. Derivative graphs 3. Force 4. Mass and inertia 1 5. Mass and inertia 2 6. Mass and inertia 3 7. Newton’s...

I'm taking grade 11 physics online for the summer time. I have a problem with this question :] An airplane flying at 50.0m/s is bringing food and emergency first aid supplies to a camp. The plane is for the pilot to drop the supplies so that they land on an "X" marked on the ground 150m below...

Homework Statement Homework Equations The Attempt at a Solution ## α = v\frac{dv}{ds} ## and K is the kinetic energy . In all the four cases ## α = v\frac{dv}{ds} = mgsinθ ## where θ is the angle which the normal to the body makes with the vertical . Fig 1) K...

Homework Statement A particle is moving along a parabola y = x2 so that at any time vx = 3 ms-1. Calculate the magnitude and direction of velocity and acceleration of the particle at the point x = 2/3 m. Homework Equations Kinematics The Attempt at a Solution vx = 3 (given) y = x2 so vy =...

Homework Statement A mouse starts running on a circular path of Radius = 28m with constant speed u = 4m/s. A cat starts from the center of the path to catch the mouse. The cat always remains on the radius connecting the center of the circle and the mouse and it maintains magnitude of its...

Homework Statement A rocket is moving in a gravity free space with a constant acceleration of 2 m/s2 along + x direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in + x direction with a speed of 0.3 m/s relative to the...

Hello to everyone! I cane across this problem and since I have no training in SR I can't solve it on my own, That is why I would very mutch apprecitate any help I could get. The problem: A photon and a spaceship simultaneously start at planet A and the travel in paralal towards planet B. The...

An antitank gun which fires missiles with a speed of 240m/s is located on a 60m high plateau overlooking the surrounding plain. The gun crew sights an enemy tank 2200m from the base of the plateau. Simultaneously, the tank crew sees the gun and starts to head directly away from the plateau. The...

1. In a crash simulation, a car traveling at x m/s can stop at a distance d m with a maximum deceleration. If the car is traveling at 2x m/s: A. Stopping time is doubled B. Stopping distance is doubled C. Stopping distance is quadrupled D. Both A and C Ok, so I thought this was a...

Hi, I have some questions regarding Kinematics: 1. If an object is accelerating at 9.8 m/s^2, how much time does it Need to reach ten percent of the Speed of light? Speed of light: 299 792 458 m / s -> 10% -> 299 792 45,8 m / s t = v/a -> 299 792 45,8 m / s / 9.8 m/s^2 = 3 059...

Hi, Could you please look at this problem in the picture and my steps? (check my answer) I do not have the solutions to the problem weirdly.

Please look at pictures. Why is it that they use 24 seconds for the time in b)? They get t=6.16s, why do they not plug that into the Dx equation to get 185m of x displacement?

A determined student is dropped from the CN Tower in Toronto, 553 in, and fall librernente. Its initial velocity is zero. Rocketeer arrives 5.00 seconds after and it fall of the tower to save him. Rocketeer is has a velocity down of magnitude vo. In order to avoid injury. Rocketeer must catch at...

[b]1. A plane is aimed north and is traveling 851 km/h. A wind blows the plane from 40° S of E at 36 km/h. What is the plane’s resultant velocity? [b]2. I think the answer is 828.3 km/h at 88.1° East of North but I am not sure. Ay= 851 Bx= cosθ cos40=x/36 x=27.6 By=sinθ...

Homework Statement A particle moving at 5 m/s reverses its direction in 1 s to move at 5 m/s in the opposite direction. If its acceleration is constant, what distance does it travel? A) 1.25 m B) 2.5 m C) 5 m D) 10 m Homework Equations d = 1/2 (v0 + v)t The Attempt at...

Homework Statement A particle starts from rest and travels in a straight line for 4 s. If the particle is accelerating at a constant rate, which of the following could be the distances traveled by the particle during each consecutive second? A) 10 m, 20 m, 30 m, 40 m B) 5 m, 15 m, 25 m...

Homework Statement Determine the initial velocity of the projectile as it comes out of a cannon at a 20° angle. Homework Equations d = (Vi)(t) + 1/2(a)(t)^2 The Attempt at a Solution I've split the question into both x and y components and solved for both using the equation above...

Kinematics -- Vector DE Homework Statement The Attempt at a Solution Here's their solution. I'm stuck on (b). The first and second lines are fine. But how do they get from the second line to the third line? And then in the fourth line, why are they integrating from u^2 to v^2? EDIT...

A ball is dropped from a 100m cliff. at the same time another ball is thrown up such that it has enough velocity to reach the top. at what distance from top of the cliff will the two balls meet?

Homework Statement A book of mass M = .55 kg rests on a table where the coefficient of static friction us = .45. A force, F = 4 N acts on the book at an angle of 15 degrees above the surface of the table. What is the acceleration of the book if the coefficient of kinetic friction uk = .23...

Homework Statement A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp (Fig. 3–41). (a) With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5 m above the cars and the horizontal distance he must clear...

basic kinematics -- fox jumping over a wall problem Homework Statement A fox is 3.2 m from a 0.5 m tall wall. If it leaps from the ground towards the wall with an initial velocity of 12.0 m/s at angle of 18.9° above the horizontal, how high off the ground will the fox be when it reaches the...

Homework Statement This is a mechanism I'm working with for my undergrad project (its Modelled in Msc ADAMS) https://www.flickr.com/photos/35430110@N04/13902494524/ https://www.flickr.com/photos/35430110@N04/13902494524/ And to give you an idea of how it operates; position 1...

Obtaining the Equation of a Path I'm working on a project for myself in SolidWorks which involves a scissor-type mechanism. The bottom ends of the linkages are attached to disks that are free to rotate around the central hub where all the gears are attached. On the other side of the hub is...

Homework Statement Dave and Andrew are racing. Dave running at a constant speed of 20m/s is passed by Andrew. 2.0s after Andrew passes, Dave accelerates at 1.0m/s^2 until he catches up with Andrew 25s later. What is Andrew's velocity (he does not accelerate)? Homework Equations...