Wednesday

October 1, 2014

October 1, 2014

Number of results: 11,576

**math**

a steel ball weighing 128 lb is suspended from a spring, whereupon the spring is stretched 2 ft from its natural length. the ball is started in motion with no initial velocity by displacing it 6 in above the equilibrium position. assuming no damping force, find an expression ...
*April 22, 2012 by anisah*

**Physics**

Two railroad freight cars with masses 110 Mg and 170Mg approach with equal speeds of 0.330 . They collide, the lighter car rebounding opposite its original direction at 0.270 m/s. Find the velocity of the heavier car after the collision. Assume the original direction of the ...
*October 10, 2012 by Lily*

**Pre-Cal(Please Help)**

1) For a person at rest, the velocity v (in liters per second) of air flow during a respiratory cycle is V = 0.85 sin pi(t)/ 3 where t is the time in seconds. (Inhalation occurs when v > 0 and exhalation occurs when v < 0) A) Find the time for one full respiratory cycle ...
*February 12, 2010 by Abby*

**Physics**

A 2.1 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 55 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kg m2/s (b) What is its ...
*July 30, 2010 by Andre*

**physics**

A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 270 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.9 m/s relative to the shore, and then hops onto an identical floating log that is ...
*March 9, 2011 by josh*

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm Apply the law of conservation of ...
*February 28, 2012 by GRISSELL*

**physics**

a man drives with an average speed of 25 mph for 20 minutes. he rests at his destination for 1 hour and then returns home with an average speed for this leg of the trip of 15 mph A) what is his average speed for the round trip B) What is his average velocity for the round trip
*November 14, 2012 by Matt*

**Physics**

An engine of the orbital maneuvering system (OMS) on a space shuttle exerts a force of for 3.90 s, exhausting a negligible mass of fuel relative to the 95,000-kg mass of the shuttle. (a) What is the impulse of the force for this 3.90 s? (b) What is the shuttles change in ...
*June 7, 2014 by Anonymous*

**Physics**

were did this come from this is a momentum problem After some messey algebra it can be said that V_B = (2 m_A V_o_A)/(m_A + m_B) V_A = ( (M_A - M_B ) V_o_A )/(M_A + M_B) were did this come from??? were _B indicates a quantity realtive to B and _A indicates a quantity realitve ...
*January 18, 2010 by Kate*

**physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +13 m/s and measures a time of 20.5 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to ...
*July 4, 2010 by Dave*

**Physics**

A car moves from a point located 26.0 m from the origin and at an angle of 35.0 from the x-axis to a point located 56.0 m from the origin and at an angle of 60.0 from the x-axis in 2.50 s. What is the magnitude of the average velocity of the car?
*December 13, 2010 by JT*

**physics 30**

A charged particle with mass m, and a charge q, is moving through a perpendicular magnetic field of strength B at a velocity,v. The particle is deflected through a curved path with a radius of 15.0 cm. If the speed of the same particle is doubled and the magnetic field is ...
*March 21, 2012 by sarah*

**Physics**

a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
*April 29, 2012 by Sarah*

**Physics**

a 1.5kg cannon is mounted on top of a 2.0kg cart and loaded with a 52.7 gram ball. The cannon, car, and ball are moving forward with a speed of 1.27m/s. The cannon is ignited and launches a 52.7 gram ball forward with a speed of 75m/s. Determine the post-explosion velocity of ...
*April 30, 2012 by Sarah*

**physics**

A 5.0 kg block with a speed of 2.8 m/s collides with a 10 kg block that has a speed of 2.0 m/s in the same direction. After the collision, the 10 kg block is observed to be traveling in the original direction with a speed of 2.5 m/s. What is the velocity of the 5.0 kg block ...
*October 30, 2011 by Chelsey *

**physics**

A missile of mass 1.10 102 kg is fired from a plane of mass 5.50 103 kg initially moving at a speed of 3.15 102 m/s. If the speed of the missile relative to the plane is 1.06 103 m/s, what is the final velocity of the plane?
*November 29, 2012 by Anthony*

**physics**

A missile of mass 1.20 102 kg is fired from a plane of mass 5.50 103 kg initially moving at a speed of 3.05 102 m/s. If the speed of the missile relative to the plane is 1.21 103 m/s, what is the final velocity of the plane?
*March 14, 2014 by Anonymous*

**physics**

2. A horizontal force of 100 N is required to push a piece of furniture across a floor at a constant velocity. (a) What is the net force acting on the furniture? (b) How much is the friction force that acts on the sliding furniture? (c) How much friction acts on the ...
*August 10, 2010 by Anonymous*

**physics**

A horizontal force of 100 N is required to push a piece of furniture across a floor at a constant velocity. what is the net force acting on the furniture? How much is the friction force that acts on the sliding furniture? How much friction acts on the furniture when it is at ...
*September 21, 2010 by m*

**Physics**

On a velocity-time graph of a person's walk, if a person is slowing down in the positive direction, then acceleration is in the negative direction.For example, the positive direction is [E]. If a person's acceleration is -1m/s^2, then it is 1 m/s^2 [West]. But that doesn't ...
*October 1, 2010 by Emily*

**physics**

You drop a rock from rest out of a window on the top floor of a building, 50.0 m above the ground. When the rock has fallen 3.80 m, your friend throws a second rock straight down from the same window. You notice that both rocks reach the ground at the exact same time. What was...
*September 17, 2014 by Anonymous*

**math,algebra**

What kind of expression is good to use for this problem so i can solve it. The kinetic energy of particle of mass m is founded by taking one-half of the product of the mass (m) and the square of the velocity (v). Write an expression for the kinetic energy of a particle. The ...
*December 11, 2006 by Jasmine20*

**Physics**

A bird watcher meanders through the woods, walking 0.35 km due east, 0.65 km due south, and 2.05 km in a direction 31.0 north of west. The time required for this trip is 3.50 h. Determine the magnitude and direction (relative to due west) of the bird watcher's. Find the ...
*October 11, 2008 by Kevin*

**Physics**

A roller coaster is at the top of a 98.2 m hill and has a mass of 1831.0 kg. It is traveling at a velocity of 23.7 m/s. What is the coaster car's TOTAL energy? I took the eg=1/2mv^2 and plugged in (1831)(9.8)(98.2) and got 1762081.16 I then took the ek= 1/2mv^2 and plugged in ...
*December 7, 2009 by Carl*

**math**

A skydiver with a weight of 185 lbs is falling. At a certain moment the force of air resistance on the sky diver is 145 lbs. What is the skydiver's acceleration at this moment? (Hint: Remember that the weight of an object is given by mg.) AND When the skydiver reaches a ...
*September 23, 2012 by kara*

**Intro-Physics **

Using a Doppler ultrasound, the velocity of blood flow in a vein or an artery can be measured. In a particular patient, the flow in a particular artery is found to be 30 cm/s at one point, and 20 cm/s at a point farther from the heart. If the two points in the artery are 50 cm...
*September 11, 2014 by Ilayda *

**physics**

From the edge of the rooftop of a building, a boy throws a stone at an angle 30.0 above the horizontal. The stone hits the ground 4.10 s later, 112 m away from the base of the building. (Ignore air resistance.) (a) Find the initial velocity of the stone. magnitude _____ ...
*February 14, 2010 by jenn*

**Pre Calculus**

If you are riding on a Ferris wheel that is 60 feet tall and it takes 5 minutes to make a one revolution, what is your linear velocity? A. 0.62 feet per second B. 0.31 feet per second C. 37.68 feet per second D. 3.14 feet per second E. 9.42 feet per second
*April 22, 2013 by Deontre*

**physics**

a large bus and a van, both moving with a velocity of magnitude v, have a head-on-collision and both the vehicles stop after the collision. if the time of the collision is 1 sec then, a) which vehicle experiences smaller force of impact? b) which vehicle experiences the ...
*June 7, 2013 by h*

**college physics**

Suppose a 69 kg person stands at the edge of a 7.8 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1600 kg*m^2. The turntable is at rest initially, but when the person begins running at a speed of 3.7 m/s (with ...
*March 29, 2010 by Anonymous*

**Physics**

A boat travelling at 30km/h relative to water is headed away from the bank of a river and downstream. The river is 1/2 km wide and flows at 6km/h. The boat arrives at the opposite bank in 1.25min. Calculate the component of the boat's velocity directed across the river. ...
*March 2, 2008 by Anonymous*

**physics**

8)If an airplane is moving at a constant velocity of 400 m/s for 20 s, what is its acceleration during this period? 0 m/s^2 b/c no change 10)You try to move a couch across the floor but it doesn't move. What is the other force acting on the couch? Static friction 11)You ...
*March 31, 2008 by Jon*

**Physics**

A car reaches a speed of 40m/s from rest in a time of 8 seconds. After teh 8 seconds, the car travels at a constant velocity fro 200meters when it runs out of gas. The car slowly comes to rest 30 seconds after running out of gas. Calculate acceleration for the first 8 seconds
*October 25, 2010 by Vivek *

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm Identify the known quantities and ...
*February 28, 2012 by GRISSELL*

**physics**

projectile motion with constant horizontal speed ? A stone falls off a cliff with horizontal velocity v m/s. it falls a distance of 5cm vertically and 200m horizontally in t seconds. when it has fallen a vertical distance of 20cm, what is its horizontal distance from the cliff...
*April 16, 2012 by raj*

**Physics**

A car accelerates from rest at 2.3m/s^2 for 18 seconds, then decelerates to 15 m/s over 301 meters. A) How fast is the car moving at 18seconds? (Is it 2.3 m/s^2) B) How far does the car travel over the entire trip? (The m/s and m/s^2 is tripping me up) C) How long does it ...
*September 2, 2014 by Emily*

**Calculus**

Find an overestimate and underestimate that the bug crawls during an hour v= 1 / [2+t]? For time, t, in hours, 0 <= t <= 1, a bug is crawling at a velocity, v, in meters/hours given by v = 1 / [2+t]. Use delta t = 0.2 to estimate the distance that the bug crawls during ...
*November 13, 2009 by Z32*

**physics**

A load of mass 100 kg is pulled by a horse on a horizontal ground with a constant horizontal force 1000 N. The frictional force between the load and the horizontal ground is 200 N. What is the velocity of the load and the work done by the horse after the load is pulled through...
*July 24, 2013 by Nur*

**Physics**

Student A is on a 9m Hugh bridge while Student B is on the ground. Student B throws an apple up to Student B with a velocity of 18m/s. How long does it take for the apple to reach student A's hand? if student A is unable to catch the apple, how long would it take for the apple...
*January 23, 2014 by Sandara*

**Physics**

Student A is on a 9m high bridge while Student B is on the ground. Student B throws an apple up to Student B with a velocity of 18m/s. How long does it take for the apple to reach student A's hand? if student A is unable to catch the apple, how long would it take for the apple...
*January 23, 2014 by Sandara*

**physics**

1)In the special case of projectile, at what initial angle the range equals the maximum height? If A is the launch angle measured from horizontal and V is the launch velocity, the maximum height achieved is H = (1/2) (V^2/g) sin^2A and the range is R = 2 (V^2/g) sin A cos A. ...
*July 30, 2006 by Genevieve*

**Physics**

(a).A 220-kg sleigh is pulled by one horse at constant velocity for 0.90 km on a snowy, horizontal surface, the coefficient of kinetic friction between the sleigh runners and snow is 0.27. What power must the horse deliver to the sleigh for the trip to take 9 minutes? (b) ...
*October 24, 2009 by Sandhu*

**mechanics**

A 60 Kg skier leaves the end of a ski-jump ramp with a velocity of 24m/s directed 25 above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 22 m/s, landing 14m vertically below the end of the ramp. From the launch to the ...
*March 27, 2011 by Anonymous*

**Physics HELP!**

I have NO idea how to do this! any help is great! A car of maass 1330kg is traveling at 28m/s. The driverapplies the brakes to bring the car to a rest over a distance of 79m. Calculate the retarding force acting on the car. From this i can see that it gives me the Mass:1330kg ...
*December 4, 2012 by Maggie*

**calculus **

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...
*April 1, 2013 by Tom*

**math**

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...
*April 2, 2013 by T-Man*

**math**

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...
*April 2, 2013 by tom*

**math**

Flight Path. In this problem you will use a cosine function to model the flight path of a plane that begins its descent from 20000 ft when it is 45 miles from the airport. Find the fuction p(x)= ACos(wx)+B that that gives the altitude in ft when the plane is x miles from the ...
*April 3, 2013 by momo*

**physics**

A long hollow non-conducting cylinder of radius 0.060 m and length 0.70 m carries a uniform charge per unit area of 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration of 40 rad/s^2 about the ...
*May 14, 2012 by Rams*

**physics**

A long hollow non-conducting cylinder of radius 0.060 m and length 0.70 m carries a uniform charge per unit area of 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration of 40 rad/s^2 about the ...
*May 20, 2012 by sand*

**PHYSICS**

An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 1.00 104 V. (a) Find the final velocity after the original acceleration period. (b) It then passes between two horizontal plates 6.0 cm long and 1.0 cm apart which ...
*February 24, 2010 by Arianne*

**physics**

Topic: Relative Velocity Question: The escalator that leads down into a subway station has a length of 30.0 m and a speed of 1.8 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for ...
*February 1, 2009 by John*

**Physics**

As soon as a traffic light turns green, a car speeds up from rest to 50.0 mi/h with a constant acceleration of 8.10 mi/hs. In the adjoining bike lane, a cyclist speeds up from rest to 20.0 mi/h with a constant acceleration of 13.0 mi/hs. Each vehicle maintains a constant ...
*April 14, 2010 by Lisa*

**physics**

The largest grand piano in the world is really grand. Built in London, it has a mass of 1.25 103 kg. Suppose a pianist finishes playing this piano and pushes herself from the piano so that she rolls backwards with a speed of 1.4 m/s. Meanwhile, the piano rolls forward so ...
*November 27, 2012 by Anonymous*

**physics**

The largest grand piano in the world is really grand. Built in London, it has a mass of 1.25 103 kg. Suppose a pianist finishes playing this piano and pushes herself from the piano so that she rolls backwards with a speed of 1.4 m/s. Meanwhile, the piano rolls forward so ...
*November 27, 2012 by Anonymous*

**physics**

The largest grand piano in the world is really grand. Built in London, it has a mass of 1.25 103 kg. Suppose a pianist finishes playing this piano and pushes herself from the piano so that she rolls backwards with a speed of 1.4 m/s. Meanwhile, the piano rolls forward so ...
*November 27, 2012 by Anonymous*

**pre-calculus**

Josh fires a catapult 18 ft above the ground with an initial velocity of 25 ft/sec. The misslie leaves the catapult at an angle of degree theta with the hoizontal and heads toward a 40 ft wall 500 ft from the launch site. If the missle is fired at a 20 degree angle, does it ...
*June 2, 2013 by Peter*

**Physics**

You have just discovered a planetary system consisting of a star (Dagobahr) and its two planets: Rool and Krau. Planet Rool has an average orbital radius 3 times as big as planet Krau. If planet Rool orbits Dagobahr in 2 earth years (1earth year = 365 days). a) how long is the...
*November 14, 2007 by Andrea*

**graphing for a moving particle**

A ball was hit over a net Vy= 0 Soy= 2.37m g= -9.8 Vox= 34.42m/s t= 2.137 Sx= 23.92m I know the equations used are Sx= (34.42m/s)t Sy= 2.37m + 1/2(-9.8)t^2 using: Sx= Soy + Vxt Sy= Soy + Vyt + 0.5gt^2 if I'm not incorrect...I plugged in the values and made 2 displacement ...
*September 30, 2007 by ~christina~*

**physics**

three dimensional identical balls 1,2 and 3 are placed on a straight line at a separation of 10m between balls . initially they are at rest. ball 1 is given a velocity of 10m/s towards ball 2. collision between ball 1 and 2 is inelastic with e=0.5 . but collision between ball ...
*January 16, 2011 by sreeram*

**physics**

three dimensional identical balls 1,2 and 3 are placed on a straight line at a separation of 10m between balls . initially they are at rest. ball 1 is given a velocity of 10m/s towards ball 2. collision between ball 1 and 2 is inelastic with e=0.5 . but collision between ball ...
*January 16, 2011 by mackson*

**physics**

A person standing at the top of a hemispherical rock of radius R = 5.00 m kicks a ball (initially at rest on the top of the rock) to give it horizontal velocity vi. (a) What must be its minimum initial speed if the ball is never to hit the rock after it is kicked? (b) With ...
*February 16, 2011 by Anonymous*

**PHYSICS**

8) A rock of mass 400 g is tied to one end of a string that is 2.0 m in length and swung around in a horizontal circle. It takes 2 s to complete one circle. a. Find the angular velocity of the rock just as the string breaks. b. At what speed is the rock traveling just as the ...
*September 19, 2011 by Anonymous*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 17, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 17, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 18, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 18, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 19, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 19, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 20, 2013 by Katy*

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 22, 2013 by Katy*

**Physics**

A person pushes with a horizontal force of 25 N 4kg block, initially at rest on a horizontal table, a distance of 3m. The coefficient of kinetic friction between the block and table is 0.35. determine external work on the block-table system. the energy dissipated by friction ...
*April 16, 2014 by Star *

**Fluid Mechanics**

Oil (sp. gr.= 0.8) flows smoothly through the circular reducing section shown at 3 ft^3/s. If the entering and leaving velocity profiles are uniform, estimate the force which must be applied to the reducer to hold it in place. When Fluid is entering the pipe: P= 50 psig ...
*September 30, 2014 by mary*

**physics**

A 0.40kg piece of putty is dropped from a height of 2.9m above a flat surface. When it hits the surface, the putty comes to rest in 0.32s . What is the magnitude of the average force exerted on the putty by the surface? I keep getting 9.4 as the answer, but it says it's wrong...
*October 29, 2013 by Jen*

**physics**

Given that the distancef rom Earth to the Moon is 3.8 x 10^8 m, that the Moon takes 27 days to orbit Earth, and that the mass of the Moon is 7.4 x 10^22 kg, what is the acceleration of the Moon and the size of the attractive force between Earth and Moon? Use v = (2pir)/T, ...
*September 18, 2006 by Lindsay*

**Physics**

A rifle shoots a 4.1g bullet out of it's barrel. The bullet has a muzzle velocity of 975 m/s just as it leaves the barrel. Assuming a constant horizontal acceleration over a distance of 43.0 cm starting from rest, with no friction between the bullet and the barrel, what force ...
*February 20, 2014 by D*

**Physics**

The acceleration of a particle moving only on a horizontal xy plane is given by a=5ti+6tj, where a is in meters per second-squared and t is in seconds. At t=0, the position vector r=(19.0m)i+(39.0m)j locates the particle, which then has the velocity vector v=(5.70m/s)i+(3.40m/...
*March 15, 2014 by Stacey*

**physics**

A 27-kg boy stands 4 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 238 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round. (b...
*March 26, 2011 by Nick*

**physics**

A 27-kg boy stands 4 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 238 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round. (...
*March 26, 2011 by Really stuck in this problem !!*

**SCIENCE**

A conductor of length 0.5m moves in a uniform magnetic field of flux density 2 wbm. at a uniform velocity of 40m/s. Calculate the induced EMF under the following conditions: (1) the conductor moves at right angle to the magnetic field (2) the conductor moves at an angle of 30 ...
*July 26, 2014 by BNzeal*

**PHYSICS**

A conductor of length 0.5m moves in a uniform magnetic field of flux density 2 wbm^2. at a uniform velocity of 40m/s. Calculate the induced EMF under the following conditions: (1) the conductor moves at right angle to the magnetic field (2) the conductor moves at an angle of ...
*July 26, 2014 by Please help me*

**physics**

1. A cyclist maintains a constant velocity of 5.2 m/s headed away from point A. At some initial time, the cyclist is 257 m from point A. What will be his displacement from his starting position after 47 s? Answer in units of m 2.What will be his position from point A after ...
*September 13, 2011 by naia*

**physics**

A cyclist maintains a constant velocity of 6 m/s headed away from point A. At some initial time, the cyclist is 245 m from point A. What will be his displacement from his starting position after 88 s? Answer in units of m What will be his position from point A after that time...
*October 5, 2013 by hannah*

**physics**

An object travels 50 meters at 90 in 6 seconds and then travels 50 meters at 245 in 13 seconds. (a) What is the magnitude of the objects resultant displacement? (b) What is the direction of the objects resutlant displacement? (c) What is the magnitude of the objects average ...
*August 13, 2014 by Donny*

**Physics**

An arrow is shot straight upward at 55 m/s. a) find the time until the arrow reaches its peak b)how high was the arrow at its peak c)find the total time the arrow is in the air d)what was the velocity of the arrow after 3.5 seconds e)how high was it at 3.5 seconds
*December 13, 2012 by Bree*

**Physics**

An arrow is shot straight upward at 55 m/s. a) find the time until the arrow reaches its peak b)how high was the arrow at its peak c)find the total time the arrow is in the air d)what was the velocity of the arrow after 3.5 seconds e)how high was it at 3.5 seconds
*December 13, 2012 by Bree*

**Physics**

An arrow is shot straight upward at 55 m/s. a) find the time until the arrow reaches its peak b)how high was the arrow at its peak c)find the total time the arrow is in the air d)what was the velocity of the arrow after 3.5 seconds e)how high was it at 3.5 seconds
*December 13, 2012 by Bree*

**Physics**

A 23-kg boy stands 3 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 180 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round in ...
*June 18, 2012 by Maria*

**Physics**

A train travels east at a speed of 50 m/s. A passenger is walking towards the rear of the train at a speed of 3 m/s. Assume that you are standing at the train station and observing the motion of the passenger as the train passes you at the station. What is the velocity of the ...
*January 7, 2013 by Shaundrea*

**math,correction**

Can someone correct my answers thanks. Problem #1 The equation h= -16t^2+112t gives the height of an arrow, shot upward from the ground with an initial velocity of 112 ft/s, where t is the time after the arrow leaves the ground. Find the time it takes for the arrow to reach a ...
*April 5, 2007 by jasmin20*

**Physics**

At what rate must a cylindrical spaceship rotate if occupants ar to experience simulated gravity of 1/2g? Assume the spaceship's diameter is 32 m, and give your answer as the time needed for one revolution. The centripetal acceleration is R w^2, where R is the radius from the ...
*January 2, 2007 by Sam*

**physics**

A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? I don't understand the following explained by Quittich (sp)? "Since there is no vertical component, the time to hit the ground is the ...
*April 2, 2008 by Jon*

**Physics 11th grade 3**

1) A box with a mass of 17 kg is moving at a velocity of 3.75 m/s. If the box was pushed with a force of 75 N how far did it go? 2) Calculate the momentum for a 0.18 kg rifle bullet traveling 369 m/s. 3) What is the impulse needed to stop the bullet? 4)Ice has a specific heat ...
*March 12, 2013 by Isis*

**Physics**

Please help me learn how to do this problem, step by step please. Engineers are developing new types of guns that might someday be used to launch satellites as if they were bullets. One such gun can give a small object a velocity of 4.1 km/s while moving it through a distance ...
*September 7, 2013 by Savannah*

**physics**

Cheetahs can sustain speeds of 25 m/s over short distances. One of their prey is Thomson's gazelle, with top speed about 22 m/s. If a 52kg cheetah running southward at top speed grabs and holds onto a 23kg gazelle running westward at 22 m/s, find the velocity of these animals ...
*February 25, 2014 by blake*

**Physics **

A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up the ramp before it ...
*May 13, 2014 by Tyler*

**Physics **

A box of mass 1.50 kg is given an initial velocity of 12.5 m/s up an inclined ramp that makes an angle of 25.0o with the ground, which is horizontal. The coefficient of kinetic friction between the box and the ramp is 0.240. How long does the box slide up the ramp before it ...
*May 13, 2014 by Tom*

**physics**

A bullet of mass = 0.13 kg is fired with a velocity of = 87.1 m/s into a solid cylinder of mass = 17.1 kg and radius = 0.29 m. The cylinder is initially at rest and is mounted on a fixed vertical axis that runs through its center of mass. The line of motion of the bullet is ...
*April 2, 2008 by shelby*

**calculus**

Consider a gun fired from a tower 96ft above the ground. The angle of elevation of the gun is 60 degrees, and its muzzle velocity is 1600 ft/sec (also gravity in this equation is 32 ft/sec^2). a)When does the bullet hit the ground? b)Write a parametric equation that models the...
*August 13, 2011 by jessica*

**Physics**

A 50 kg skater at rest on a frictionless rink throws a 2 kg ball, giving the ball a velocity of 10 m/s. Which statement describes the skaters subsequent motion? Explain please. a. 0.4 m/s in the same direction as the ball. b. 0.4 m/s in the opposite direction of the ball. c. 2...
*December 2, 2012 by Alexa*

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