Initial velocity Definition and 451 Threads

Homework Statement You throw a snowball from a height of 11m at an angle of 25 degrees to the horizontal to hit your teacher in the chest (1.5m from the ground) who is on the sidewalk 37m from you horizontally, at what velocity must you throw the snowball to hit your teacher Homework...

Hey I am having a bit of trouble finding the proper equation to use when solving a problem such as this... A physics book slides off a horizontal tabletop with a speed of 1.10 m/s. It strikes the floor at 0.350 s. Ignore air resistance. Find (a) the height of the tabletop above the floor, (b)...

Homework Statement A rocket is shot off a 3220 M high mountian at an angle of 35.3 to the horizontal. The rocket lands 9580 m away from the mountian, what was the initial velocity? Homework Equations y=Vi(y) *t +1/2gt^2 x= t*Vi(x) Vi(y)= sin 35.3 Vi Vi(x)= cos 35.3 Vi The...

Homework Statement A Circus performer is shot our of a cannon and shot over a net that is placed horizontally 6 meters from the cannon. When the cannon is aimed at an angle of 40 degrees above the horizontal, the performer is moving in the horizontal direction and just barely clears the net...

Homework Statement A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.1 s later it is rising at a speed of 19 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.2 s after the launch. Homework Equations v = v0 +...

I have just started a calculus book, and I can't figure out how to solve this problem: Homework Statement The landing velocity of an airplane (i.e., the velocity at which it touches the ground) is 100 mi/hr. It decelerates at a constant rate and comes to a stop after traveling 1/4 mile...

Homework Statement An athlete executing a long jump leaves the ground at a 31.6° angle and travels 7.78 m. What was the take-off speed? I have tried to solve this question but somehow keep arriving at the wrong answer. The formula that I derived is : distance=V(initial)*sin^2(theta)/g...

A basketball player makes a shot from a height of 2.50 m at an angle of 30 degrees above the horizontal. The horizontal distance between the player and the hoop is 6.00 m. The hoop is 3.00m above the ground. Find the magnitude of the initial velocity of the ball which will cause it to go...

A spring gun has a spring with a constant of 2.0 N/cm. If the spring is compressed 3.0cm and the gun is loaded with a .15 kg ball, what will be the initial velocity? Equations such as E(k subscript)=0.5mv^2 E(p subscript)-mgh [b]3. i think that since...

Homework Statement It gives the mass, energy gained (change in energy), initial velocity and power and time I　need to find final velocity Homework Equations EK= 0.5mv^2 The Attempt at a Solution I was thinking of plug in the number into above formula but if i do this i won't be...

Homework Statement Hello I am asked to find the solution to the following equation no infinite series solutions allowed. We are given that there is a string of length 4 with the following... ytt=yxx With y(0,t) = 0 y(4,t) = 0 y(x,0) = 0 yt(x,0) = x from [0,2] and (4-x) from [2,4]. Homework...

Hey everyone; I am a grade 12 student and I am totally stuck on this question and would appreciate your help. I don't want just the answer, I need help with the steps so that I understand how to do this type of problem. Here's the question: A police officer arrives at the...

why doesn't the vertical distance traveled in the given time ,under the action of gravity alone, below the straight line it would follow in the absence of gravity, depend upon the angle of projection of a projectile? With no gravity, the projectile, which is projected at an angle at certain...

Homework Statement Someone throws a rubber ball vertically upward from the roof of a building 8.00 m in height. The ball rises, then falls. It misses the edge of the roof, and strikes the ground. If the ball is in the air for 3.00 s, what was its initial velocity? (Disregard air resistance...

Homework Statement Johnny jumps off a swing, lands sitting down on a grassy 20 degree slope, and slides 3.5m down the slope before stopping. The coefficient of kinetic friction between grass and the seat of Johnny's pants is 0.5 What was his initial speed on the grass?

Homework Statement A person wants to shoot a rocket off of a mountain 3.70 km high so that the rocket, when shot at 37.7° above the horizontal from the very top of the mountain, lands at the foot of the mountain 9.65 km (horizontal distance) away. What initial speed must the rocket have...

Homework Statement An Olympic basketball player shoots towards a basket that is 5.52 m horizontally from her and 3.05 m above the floor. The ball leaves her hand 1.52 m above the floor at an angle of 32.0o above the horizontal. What initial speed should she give the ball so that it reaches the...

Homework Statement According to the range equation (see below), what angle would give teh maximum range for a given initial velocity? Mathematically explain your hypothesis. Homework Equations The equation given in our book for range: R=(V_{o}cos\Theta)*(2V_{o}sin\Theta)/g...

Homework Statement Exact question: A hobby rocket reaches a height of 35m and lands 259m from the launch point. What was the angle of launch? We know... Xmax = 259m Ymax = 35m Xo and Xmax are at equal y values, or heights, 0 in my chosen coordinate system Homework Equations 1)...

Homework Statement A kicker is attempting a field goal from 50 m from the goal posts, which are 3.44 m high. He can kick the ball with initial speeds of 25 m/s. Ignoring air resistance, within what angular range must he kick the ball to score? Homework Equations Pf = Pi + Fnet*t And any...

Hey guys, I was wondering how to find the initial velocity of a ball going up with only the time. The time I have is 3.37, would I use the formula: dy=1/2(a)(t)^2 to find the initial velocity? I got 33.026 m/s but I don't think that's right.

Homework Statement haha, so hopefully my last question for the night! Find the initial velocity, when the object is shot at 70 degrees and took 6.5s to land. (hint: look at the y direction first this time) (For more information regarding my question, visit my earlier question from tonight...

Homework Statement An object is shot (from a cannon) at an angle of 33 degrees and landed 85 m away. Calculate the magnitude of the initial velocity (Hint:Look at the x direction and solve for Vox) Homework Equations Other questions I must answer. If you have time, help with these would...

Homework Statement To Find initial velocity, given final velocity, and displacement on Y axis. Hello. I've spent four hours trying different solutions to this following problem, none of which have worked. I've just started my undenominated science degree, and since I havn't started lectures...

Homework Statement 1. A projectile is launched at angle(theta) relative to the horizontal (see the figure below). The initial height of the projectile above the surface of the table is h, and it hits the table at distance (delta)x from the launch point. Find the launch speed vi of the...

Problem: Starting co-ordinates S 45° 50.061 E 170° 27.079 A catapult stationed at the above coordinates will hit the castle, if it shoots at maximum range (X meters) at 48ºtrue. Assume equal initial and final elevation for the projectile’s trajectory, and the projectile’s initial velocity is...

Homework Statement A ball thrown into the air lands on the same horizontal level, 38 m away, and 3 s later. Find the magnitude of the initial velocity. Homework Equations x = vox The Attempt at a Solution I just plugged the x distance which is 38m and the time which is 3s into...

You shoot an arrow into the air. Two seconds later (2.00 ) the arrow has gone straight upward to a height of 25.0 above its launch point What is the initial velocity or the formula I would use to find

Homework Statement Knowing that snow is discharged at an angle of 40 degrees, determine the initial speed, v0 of the snow at A. Answer: 6.98 m/sHomework Equations The Attempt at a Solution I have found the x and y velocity and position formulas. Now since I don't know time, should I...

Initial Velocity and Acceleration--Please Help! Homework Statement You are driving along a straight section of roadway (x-axis). You spot a police officer and apply the brakes, slowing down at a constant rate. Your positions (in meters) at successive time intervals of 0.515 s are tabulated...

Hi all, I am trying to work out the initial velocity of dry air, through a 3" opening in a pressurized tank (150 psi). I thought I should use Bernoulli's eq. as a start: P=1/2*rho*V^2 by changing the formula to give velocity, V = sqrt(P*2/rho) Then I realized there was no time value in...

Homework Statement Hi, I need to figure out the initial velocity if an object of 1400 kilograms is subjected to a friction coefficient (sliding friction) of 0.4587 for 75.6 metres, and its final velocity after being subjected to that friction is 23.05 metres per second. How do I go about this...

Homework Statement A juggler throws a ball straight up into the air with a speed of 10 m/s. With what speed would she need to throw a second ball half a second later, starting from the same position as the first, in order to hit the first ball at the top of the projectory? My problem is I am...

Homework Statement A shotputter projects the shot at 42 degrees to the horizontal from a height of 2.1 m. It lands 17 m away horizontally. Next, he gives it the same initial speed but changes the angle to 40 degrees. What effect does this have on the horizontal range? Homework...

Homework Statement The acceleration of a particle is given by a_{x}(t)= - 1.94 m/s2 +( 3.05 m/s3 )t. Find the initial velocity v_{0x} such that the particle will have the same x-coordinate at time t= 4.00 s as it had at t=0. Homework Equations vx= v0x + the integral ax dt The...

Homework Statement Find the initial velocity of a ball with the time=2.58 seconds and distance of 9.87 meters Homework Equations vi=v-at The Attempt at a Solution I don't understand how to find the acceleration with just time and distance is it just 9.8 m^3/second?

Homework Statement What I'm supposed to do is to rearrange the this formula -16t^2+Vt+h and solve it for V. V= Initial Velocity t= time (throwing the ball in a parabolic arc) h= height I know what the height is and it is 6ft. I also have the time which is 2.03 seconds. How do I rearrange...

What formula would I use to find the initial velocity? An object is thrown vertically into the air and reaches a height of 30.0 m. Neglecting air friction, what was the object’s initial velocity? I don't quite remember how to do this. Is it 30.0m / 9.81[m/s]^2?

I am trying to find the initial velocity of a soccer ball , but I found this equation and do not understand how it came about: [PLAIN]http://superforbrain.com/files/vBall.PNG This is supposed to give you the velocity of the ball right after its kicked, using the mass of your leg, velocity of...

Hello, this may be a rather simple question but it's beginning to irritate me: If I were launching a marble of, say, 10g (0.010 kg) from a marble launcher with a force of 5N (tell me if this is realistic or not) at an angle of 15 degrees then how would I go about finding the initial velocity of...

Homework Statement Part a.) You launch a 0.5 kg water balloon with a spring cannon in order to his someone 20m away. The spring in the cannon has a spring constant of 350 N/m. The spring cannon fires the balloon at a 30 degree angle with respect to the ground. What is the initial velocity...

An object is thrown vertically into the air and reaches a height of 30.0 m. Neglecting air friction, what was the object’s initial velocity? What would the equation be for this question? I know that: Height: 30.0m Gravity: 9.81m/s I'm not quite sure what else I need to figure this...

1. Homework Statement [/b] Bullet B weighs 0.5 oz and blocks A and C both weigh 3 lb. The coeffient of friction between the block and the plane is \muk = .25. Initially the bullet is moving at v0 and blocks A and B are at rest. After the bullet passes through A it becomes embedded in block C...

Hi guys! We started integral word problems today. I am very confused and could use some help with the following; A particle is moving along a straight line accelerating at a constant rate of 5 m/s^2. Find the initial velocity if the particle moves 60m in the first 4 seconds. Now, I...

Homework Statement In 2.0 s, a particle moving with constant acceleration along the x-axis goes from x = 10 m to x = 50 m. The velocity at the end of this time interval is 10 m/s. What is the acceleration of the particle? Homework Equations kinematic equations The Attempt at a...

Homework Statement A rock is thrown from the top of a twenty meter high building at the angle 53 degrees above the horizontal. IF the horizontal range of the throw is equal to the height of the building, what is the speed of the rock? How long is it in the air? What's the velocity of the rock...

Homework Statement A dog can jump to a height of 0.20 m. What is the initial velocity of the dog? Homework Equations v=v0+at The Attempt at a Solution I'm not sure if this is suppose to be a trick question. Are they talking about the gravitational acceleration? v=v0+at v0= 0...

[Please Help!] Find Initial Velocity (With Wind Factored In) I can't do it =\. Q: What equation would I use to find initial velocity? Given: Wind Speed, Wind Angle, Coordinates of Origin, Coordinates of End Point, (Distance), Projectile Mass, Theta (Angle to Use) Here's my repost from a...

Homework Statement A grasshoopper jumps 1.00 m from rest, with an initial velocity at a 45.0 degree angle with respect to the horizontal. Find the initial speed of the grasshopper (answer is 3.13 m/s) The maximum height reached (answer is .250m) Homework Equations...

Homework Statement Assuming the best high jump record from a standing position in a school was 1.52 m, what initial velocity was needed for this jump? neglect any sideways motion. Homework Equations velocity equation The Attempt at a Solution I don't really understand how to do...