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# Velocity

### Vectors

Please give step by step answers with solutions details please. I learn by seeing things done. Thank you! Their are 3 attachments.

### Velocity and Acceleration - Position versus Time

Please give the solution and a step-by-step way to figure the answers out please. Learning is important. Use the data for all these questions on position versus time. The graph points are at 8 meters t=0 seconds. -4 meters at 1 second, -8 meters at 2 seconds, -4 meters at 3 seconds, 0 meters at 4 seconds and 28 meters at 5

### Evaluating Velocity and Acceleration

Hi, please give the step by step solutions so I can see how you got the answers and understand it. The graph on the page is a velocity versus time graph. The time is in seconds. The graph has points at (0,20),(5,40),(10,60),(15,80),(15,60),(15,40),(15,20),(15,0),(15,-20),(15,-40),(20,-40), and then the next point is approxima

### Average velocity

Please give step by step answers please. 1) The position versus time for a certain object moving along the x-axis is shown. The object's initial position is -3meters. The graph is position in meters for the y axis and the x axis is time in seonds. Point one on the grpah for 0 sec. is at (0,-3), 1 sec at (1,3), 2 sec (2

### Average Velocity for Certain Objects Moving

1) The position versus time for a certain object moving along the x axis is shown. The objects initial position is -3m. The graph points since I cannot draw it start at (0,-3),(2,9),(3,6),(4,4),(5,4),(6,0),(7,-4) and (9,0). a) Find the average velocity in the time interval 0s to 2s in m/s. b) Find the average velocit

### Average Velocity and Distance

Questions: 1) Two ants race across a table that is 72.5 cm long. One travels at 4.02 cm/s and the other at 2.7 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. 2) The position of a car coasting down a hill was observed at various times and the results are summariz

### Pressure/Bernoulli's equation

Hi. Can someone please walk me through how to do the following problem? On a vacation flight, you look out the window of the jet and wonder about the forces exerted on the window. Suppose the air outside of the window moves with a speed of approximately 150 m/s shortly after take-off, and that the air inside the plane is at a

### (3.10) angular accelleration of this wheel? Find tension in the string?

At t=0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2 rad/s. Two seconds later it has turned 5 complete revolutions. What is the angular acceleration of this wheel? ============================================== Answer: a) 17 rad/s^2 b) 14 rad/s^2 c) 20 rad/s^2 d) 23 ra

### {25.18} How far is the speaker from each observer? The velocity (in m/s) of the body at t=1 second is:

A loudspeaker is placed between 2 observers who are 120m apart, along the line connecting them. If one observer records a sound level of 60.0 dB and the other records a sound level of 90 dB, how far is the speaker from each observer? Hint: use the equation which relates to the difference between the decibel levels to the distanc

### Proportional Velocity Word Problem

All work must be shown step by step, any answers given without proper justification will not be accepted. Keep track of units and use proper notation. An object is dropped from a tall building, If the air resistance is proportional to the square of the velocity, then (dv/dt)=-32(ft/sec^2)+kv^2 where k is a constant. Show th

### Waves in a String

A cello string .75m long has a 220-Hz fundamental frequency. Find the wave speed along the vibrating string. How can you produce a low- pitch by altering the length of the string, the thickness, and tension?

### Time and distance

2 buses, 385 miles apart, are traveling directly toward each other on the same road. One is traveling 60 miles an hour and the the other is traveling 50 miles an hour. After how long will they meet?

### traveling wave equation obtain much information about the wave.

One end of a long wire under tension is moved up and down sending a wave along it. Assume the wire lies along an x axis with the moving end at the origin. The equation giving displacement y, in meters, of points on the wave is: (1) y= (.06 m) sin (5 x - 25 t) a. From given constants, calculate the value and units of the quan

### Bernoulli's Theorem: Perfume Atomizer

An old fashioned perfume atomizer operates by the user squeezing a bulb which sets up a rapid flow of air through a horizontal tube. The reduction in pressure due tothis rapid flow causes perfume to be sucked up a vertical tube from the bottle and then expelled from the horizontal tube along with the air. For simplification, we

### Bernoulli's Equation with Velocity

How do i rearrange Bernoulli's equation to eliminate the pressure and make velocity the subject?

### A compressed spring drives two blocks from rest. They separate and the remaining block executes SHM.

On a frictionless table, a spring has one end fixed and the other attached to block M. Block m, is in contact but not attached to M. The spring, originally unstressed was compressed from 0 to -S. There the spring system was released from rest. See ATTACHMENT for a diagram with parameters and basic physics. Block M= 2.0 kg, blo

### Developing total energy, amplitude and maximum speed

A mass M attached to an ideal spring with force constant k executes SHM on a horizontal frictionless table. It has a total energy of 1.0 Joule and amplitude .10 m, and its maximum speed when location x= 0, is 1.2 m/sec. a. find k and M and the period T. b. If the initial location of the mass is at x= +Xm, develop x(t), and v(

### SHM equations from the motion of a point moving in a circle

A point p moves in a circle of radius R, at constant angular velocity w. The origin of an x axis is at the center of the circle. Represent as vectors, the location, the velocity and the acceleration of point p, then show the x direction projection of these three vectors to represent the location, the velocity and the acceleratio

Task: Suppose a pulsar with a speed of 0.96c approaches Earth, and a rocket with a speed of 0.995c heads toward the pulsar (both speeds measured in Earth's frame of reference). If the pulsar emits 10 pulses per second in its own frame of reference, at what rate are the pulses emitted in the rocket's frame of reference?

### Two Trains Problem: Two trains leave different cities heading toward each other at different speeds. When and where do they meet?

Specifically, Train A, traveling 70 miles per hour (mph), leaves Westford heading toward Eastford, 260 miles away. At the same time Train B, traveling 60 mph, leaves Eastford heading toward Westford. When do the two trains meet? How far from each city do they meet? Thanks.

### Momentum: Rocket moves in outer space; final velocity if gas is 25% of initial mass

A rocket moves in outer space with no external forces acting on it. It starts from rest and then continuously exhausts gas at a speed of 6.0 km/s, relative to the engines. Find the final velocity of the rocket if the gas accounts for 25% of its initial mass. Complete step by step solution needed.

### Collision: Determining Velocity

Ball 1 with an initial speed of 12 m/s collides elastically with stationary balls 2 and 3 that are initially in contact with each other. The centers of balls 2 and 3 are on a line perpendicular to the initial velocity of ball 1. The three balls are identical. Ball 1 is aimed directly at the contact point, and all motion is frict

### A Collision problem.

A 0.15 kg ball hits a wall with a velocity of (6.00 m/s) i + (6.50 m/s) j + (5.50 m/s) k. It rebounds from the wall with a velocity of (2.00 m/s) i + (3.50 m/s) j + (-3.20 m/s) k a) What is the change in the ball's momentum? (__i +__j +__k ) kg · m/s b) What is the impulse on the ball? (__i +__j +__k ) N · s (c) Wh

### Momentum: Rocket Firing in Space

A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 265*10^105 kg, of which 200*10^5 kg is fuel. The engine is fired for 250s, during which fuel is consumed at the rate of 480 kg/s. The speed of the exhaust product relative to the rocket is 3.23 km/s. a) What is the rock

### Momentum Concepts Found

Why is it difficult for a fire-fighter to hold a hose that ejects large amounts of water at high speed? If an 18-wheeler hit Geo (small car) at equal speeds in a head-on collision: Which vehicle will experience the greatest ... force of impact? change in momentum? acceleration? A billiard ball will stop when it collid

### Collisions and Momentum

Question: Miguel has a mass of 100 kg and is running toward end-zone at 9 m/s. Gonzales mass of 75 kg runs at Miguel at 12 m/s. They collide at two year line. Does Miguel score? Explain using momentum or collision.

### Collisions Contact Forces

Question: A tennis player returns a 30 m/s serve back at 25 m/s after making contact with the ball for .5 seconds. If the ball has a mass of 0.2 kg, what is the force she exerted on the ball?

### Impulse and Velocity

Question: A 50 kg cart is moving across a friction-less floor at 2 m/s. A 70 kg boy, riding the cart, jumps off so that he hits the floor with zero velocity. 1. What impulse did the boy give to the cart? 2. What was the velocity of the cart after the boy jumped?

### Momentum and Impulse inquiry

While being thrown, a net force of 132 N acts on a baseball (mass = 140 g) for a period of 4.5 X 10^-2 seconds. The balls initial velocity is zero before leaving the pitchers hand. When the batter hits the ball, a net force of 1320 N, opposite the direciton of the balls initial motion, acts on the ball for 9 X 10^-3 seconds du