Wednesday

October 7, 2015
Number of results: 79,536

**physics emergerncyy!**

A particle of mass m1 = 2.5 kg moving along the x axis collides with a particle of mass m2 = 4.7 kg initially at rest. The incoming particle is deflected in the direction 24 degrees above the x axis, whereas the target particle moves off at 14 m/s at 39 degrees below the x ...
*November 19, 2011 by joe*

**physic**

please help, I really appriciate you help alot. Question:A 0.34 kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. (a) What is its kinetic energy at A? ___ J (b) What is its speed at point B? ____ m/s (c) What is the total work done on the ...
*October 24, 2009 by Chan*

**Physics Please help !!**

A single conservative force = (6.0x - 12) N where x is in meters, acts on a particle moving along an x axis. The potential energy U associated with this force is assigned a value of 23 J at x = 0. (a) Write an expression for U as a function of x, with U in joules and x in ...
*October 23, 2012 by member of physics*

**uniten**

3. At t = 0 , a particle leaves the origin with a velocity of 9.0 m/s in the positive y direction and moves in the xy plane with constant accelaration of ( 2.0i - 4.0j ) m/s2 . At the instant the x coordinate of the particle is 15 m , what is the speed of the particle ?
*June 15, 2011 by ameer*

**magnets**

A particle of charge +q and mass m is initially launched at speed v in a region with a constant, uniform magnetic field of magnitude B. If the particle launched in a direction perpendicular to the magnetic field, by the time the particle has traveled a distance d, the work ...
*December 18, 2013 by Anon*

**physics**

A particle leaves the origin with an initial velocity = (2.35 m/s) and moves with constant acceleration = (-1.90 m/s2) + (2.60 m/s2)>. (a) How far does the particle move in the x direction before turning around? m (b) What is the particle's velocity at this time? ( m/s...
*October 14, 2011 by Kaylah*

**Calculus**

How would I solve this: -A particle moves along a line so that, at time t, its position is s(t)=8 sin2t. a) For what values of t does the particle change direction? b) What is the particle's maximum velocity?
*April 8, 2010 by Terry*

**college physics**

Each of four particles moves along an x-axis. Their coordinates (in meters) as functions of time (in seconds) are given by: Particle #1: x(t)=2t^2-4 Particle #2: x(t)= -3t-4 Particle #3: -2t^2-4 Particle #4: 2 *[sq. root (t+1)] -4 Which of these particles are speeding up for 0...
*August 24, 2010 by Thomas*

**Physics**

A particle starts from xi = 10 m at t0 = 0 and moves with the velocity graph shown in the graph below. Sorry for no graph it's at 12 m/s when time is zero. Moves down consistently so that it is 8 at 1 4 at 2 0 at 3 and negative 2 at 4. (a) What is the object's position at t = ...
*September 5, 2011 by Kaitlyn*

**Physics**

Here's the question I'm currently working on... What initial kinetic energy must an α particle have if it is to approach a stationary lead nucleus to within a distance of 35.9 fm? So I looked up a couple of things I thought we need for this problem. I have the atomic ...
*April 30, 2009 by Marissa*

**Physics**

A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical energy of the oscillator...
*November 30, 2010 by Greg*

**physics**

The potential energy of a particle on the x-axis is given by U= 8xe ^-x ^2/19 where x is 1 meter and U is in Joules. Can you explain for me how to find the point on the x-axis for which the potential is a maximum or minimum and is this answer a point of maximum potential ...
*November 21, 2009 by jon*

**Physics**

Uugghhh help please. The velocity of a 4.6 kg particle is given by vector v=(4t{i}+7t^2{j}), where v is in m/s and t is in seconds. At the instant when the net force on the particle has a magnitude of 40 N, what is the angle between the particle's acceleration and the particle...
*July 2, 2015 by Jesus*

**calculus**

a particle moves along a number line measured in cm so that its position at time t sec is given by s=72/(t+2) +k, k is a constant and t>=0 seconds. (a) Find the instantaneous velocity of the particle at t=4 seconds (b) Find the acceleration of the particle when t =4 seconds...
*February 4, 2011 by nadra*

**Dyanamics**

A particle of mass m moves in a x-y plane. the co-ordinates of the particle at any instant are given by x=acos(wt) & y=bsin(wt) where a,b,w are constsnt.Determine the angular momentum of the particle with .r.to the origin of the co-ordinate system
*December 6, 2013 by vinod*

**physic**

A 0.34 kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. (a) What is its kinetic energy at A? _____ J (b) What is its speed at point B? _____ m/s (c) What is the total work done on the particle as it moves from A to B? _____ J thank you so much
*October 20, 2009 by Chan*

**Physics**

Before the force is applied (t < 0 on the graph), the particle moves along the X axis with velocity V1 = -7.6 m/s. Find the velocity V2 of the particle after force stops acting on it. (t > 8s)
*October 30, 2011 by Amy*

**Physics**

Before the force is applied (t < 0 on the graph), the particle moves along the X axis with velocity V1 = -6.6 m/s. Find the velocity V2 of the particle after force stops acting on it. (t > 9s)
*December 10, 2012 by jason*

**Physics**

F=6kt This force acts on a particle of mass "m" that moves along a line. If the particle starts from rest, determine its velocity and position at time t.
*November 12, 2012 by shawn*

**AP Calculous**

A particle moves on the x –axis so that its position at any time is given by x(t) = 2t3 + 1. a. Find the acceleration of the particle at t = 0. b. Find the velocity of the particle when its acceleration is 0. c. Find the total distance traveled by the particle from t = 0 to t...
*November 6, 2011 by Yoona*

**calculous**

A particle moves on the x –axis so that its position at any time is given by x(t) = 2t3 + 1. a. Find the acceleration of the particle at t = 0. b. Find the velocity of the particle when its acceleration is 0. c. Find the total distance traveled by the particle from t = 0 to t...
*November 7, 2011 by Yoona*

**physical**

The potential energy of a 2.0-kg particle moving along the x axis is given by U(x) = 5.0 x^2. When the particle is at x = 1.0 m it is traveling in the positive x direction with a speed of 1.5 m/s. It next stops momentarily to turn around at x =
*December 12, 2014 by Anonymous*

**physics **

Two spheres are mounted on identical horizontal springs and rest on a frictionless table, as in the drawing. When the spheres are uncharged, the spacing between them is 0.05 m, and the springs are unstrained. When each sphere has a charge of +1.6 £gC, the spacing doubles. ...
*February 25, 2014 by Anonymous*

**physics**

a particle of mass m moves in a x-y plane. The coordinates of the particle at any instant are given by x = acos(wt) and y = bsin(wt). where a,b,w, are constant. Determine the angular momentum of the particle with respect to the origin of the coordinate system.
*October 21, 2013 by Sarsi*

**HS Calculus**

Having trouble with this questions. Please help. A particle moves on the x-axis so that its position at any time t (is greater than or equal to) 0 is given by x(t) = 2te^-t a) Find the acceleration of the particle at t=0 b)find the velocity of the particle when its ...
*March 29, 2009 by Jane*

**Calculus**

A particle moves in a straight line under a force such that its displacement s(t), in metres, at time t seconds, is given by s(t) = t3 − 5t2 + 3t +15 (i) Find the expression for the velocity of the particle. (ii) Find the time at which the particle is at rest. (iii) Find...
*May 20, 2013 by Pammy*

**PHYSICS**

a. A 25 nC particle and a – 7 nC particle is interacting with each other at a certain distance. Find the force between the two charges @ 3.0 cm and 1.0 cm Calculate and draw each of the particle’s electric fields. Calculate the electric potential values of the two particles. ...
*August 18, 2011 by KAIT*

**physics**

Several forces act on a particle as shown in the figure below (where F1 = 75.0 N, F2 = 65.0 N, θ1 = 25.0° and θ2 = 74.0°, . If the particle is in translational equilibrium, what are the values of F3 (the magnitude of force 3) and θ3 (the angle that force 3 makes...
*May 27, 2010 by Larissa*

**calculus**

a particle moves along the x-axis (units in cm) its initial position at t=0 sec is x(0)=15. the figure shows the graph of the particle's velocity v(t). the numbers are areas of the enclosed regions. in the graph 0 to a is 4 under the x-axis, a to b is 5 above the x-axis, b to ...
*April 28, 2010 by shelby*

**Physics **

A particle of mass =6.50 kg moves with a velocity v1=x1i+y1j+z1k. A second particle of mass =3.50 kg moves with a velocity v2=x2i+y2j+z2k. And a third particle of mass =6.30 kg moves with a velocity v3=x3i+y3j+z3k. Here, (x1,y1,z1)=(-2.5,5.4,1.2), (x2,y2,z2)=(-2.3,0.1,-2.5) ...
*October 13, 2014 by zhang135*

**physics**

A 10 g particle undergoes Simple Harmonic Motion with an amplitude of 2.0 mm, a maximum acceleration of magnitude 8.0 X 10^3 m/s^2, and an unknown phase constant, theta. What are a.) the period of the motion, b.) the maximum speed of the particle, and c.) the total mechanical ...
*November 30, 2010 by Scott*

**physics**

A particle with a +5.0 µC charge and a kinetic energy of 0.090 J is fired into a uniform magnetic field of magnitude 0.30 T. If the particle moves in a circular path of radius 3.0 m, determine its mass.
*March 26, 2013 by erika*

**Physics **

A particle of mass m moves in a x-y plane. the coordinates of the particle at any instant are given by x=acos(wt) y = bsin(wt). where a,b,w, are constants. determine angular momentum ofthe particle with respect to the origin of the coordinate system.
*October 23, 2013 by Sarsi*

**physics**

A particle of charge Q is fixed at the origin of an xy coordinate system. At t = 0 a particle (m = 0.690 g, q = 4.75 µC) is located on the x axis at x = 20.0 cm, moving with a speed of 50.0 m/s in the positive y direction. For what value of Q will the moving particle execute ...
*February 11, 2010 by Sandhya*

**Physics**

The force on a particle is directed along an x axis and given by F = 1.7(x/2.8 - 0.95) where x is in meters and F is in Newtons. Find the work done by the force in moving the particle from x = 0 to x = 6.9 m.
*March 8, 2014 by Robin*

**physics**

A 0.25 kg particle moves along an x axis according to x(t) = - 10 + 3 t + 2 t2 - 5 t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.6 s ? Give an expression for the (a) x, (b) y and (c) z components.
*February 7, 2015 by Anonymous*

**Physics**

A particle with m = 3.3E-27 kg is moving with a velocity of 6.0E7m/s. It then collides with a stationary particle of mass 2m, the lighter particle then moves at a right angle to the original direction with a velocity of 2.0E7m/s. What is the veloctiy of the heavier particle ...
*February 15, 2011 by Amnit*

**College Physics**

particle 1 of charge q1 = 1.04 ìC and particle 2 of charge q2 = -2.99 ìC, are held at separation L = 10.8 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a)x and...
*July 6, 2012 by Stephanie13*

**physics**

Two particles A and B are in uniform circular motion about a common center. The acceleration of particle A is 4.7 times that of particle B. Particle B takes 2.4 times as long for a rotation as particle A. Th ratio of the radius of the motion of particle A is that of particle B...
*September 23, 2011 by Audrey Petricevich*

**PHYSICS**

a MAGNET CAN EXERT A FORCE ON A MOVING CHARGED PARTICLE, BUT IT CAN NOT CHANGE THE PARTICLE'S KINETIC ENERGY. WHY?
*February 6, 2008 by tina*

**Physics**

A magnet can exert a force on a moving charged particle, but it cannot change the particle's kinetic energy. Why not?
*February 9, 2008 by Heather*

**physics**

In the figure, particle A moves along the line y = 29 m with a constant velocity of magnitude 3.5 m/s and parallel to the x axis. At the instant particle A passes the y axis, particle B leaves the origin with zero initial speed and constant acceleration of magnitude 0.44 m/s2...
*September 12, 2010 by Anonymous*

**Physics**

In the figure, particle A moves along the line y = 26 m with a constant velocity of magnitude 2.6 m/s and parallel to the x axis. At the instant particle A passes the y axis, particle B leaves the origin with zero initial speed and constant acceleration of magnitude 0.31 m/s2...
*September 21, 2010 by Anonymous*

**Physics**

A charged particle moves into a region of uniform magnetic field B, goes through half a circle, and then exits that region. The particle is either a proton or an electron (you must decide which). It spends 155 ns in the region. a) What is the magnitude of B? b)If the particle ...
*November 17, 2010 by LA*

**Calculus (Answer Check)**

A particle moves along the x-axis so that its velocity at time t, 0(less than or equal)t(greater or equal to)5 is given by v(t)=3(t-1)(t-3). at time t=2 the position of the particle is x(2)=0. 1. find the minimum acceleration of the particle 2. find the total distance ...
*October 27, 2008 by Michelle*

**Calculus (Answer Check)**

A particle moves along the x-axis so that its velocity at time t, 0(less than or equal)t(greater or equal to)5 is given by v(t)=3(t-1)(t-3). at time t=2 the position of the particle is x(2)=0. 1. find the minimum acceleration of the particle 2. find the total distance traveled...
*October 27, 2008 by Michelle*

**physics**

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate the speed of a particle...
*April 28, 2012 by martini*

**physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 4.50t2 - 3.00t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.60 s?
*February 12, 2010 by Anonymous*

**physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s?
*May 4, 2010 by Anonymous*

**physics help**

The magnitude of the velocity of a particle which starts from rest 2 ft below the origin when t = 0 and moves along a vertical axis is directly proportional to the time after starting. The displacement of the particle during the time interval from t = 1 sec to t = 2 sec is 3 ...
*January 20, 2011 by stan*

**physics help**

The magnitude of the velocity of a particle which starts from rest 2 ft below the origin when t = 0 and moves along a vertical axis is directly proportional to the time after starting. The displacement of the particle during the time interval from t = 1 sec to t = 2 sec is 3 ...
*January 20, 2011 by stan*

**Calculus**

A particle moves on a vertical line. Its position, s, in metres at t seconds is given by s(t) = t^3 - 9t^2 + 24t, t>0/ I found the velocity and acceleration functions. s'(t) = 3t^2 - 18t + 24 s''(t) = 6t-18 b) When is the particle moving up? down? c) Find the distance the ...
*May 3, 2008 by Alex*

**physics**

A 2.53-μC charged particle with a kinetic energy of 0.0929 J is fired into a uniform magnetic field of magnitude 0.147 T. If the particle moves in a circular path of radius 2.92 m, determine its mass.
*July 21, 2014 by Caty*

**Diff eqn- IVP**

A particle moves on the x-axis with an acceleration, a=(6t-4)ms⁻1. Find the position and velocity of the particle at t=3 , if the particle is at origin and has a velocity of when t=0
*March 12, 2011 by shasha*

**PHYSICS**

A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
*April 29, 2015 by Mary*

**physics**

The figure below shows a plot of potential energy U versus position x of a 1.30 kg particle that can travel only along an x axis. (Nonconservative forces are not involved.) In the graphs, the potential energies are U1 = 10 J, U2 = 35 J, and U3 = 50 J.
*October 22, 2014 by Raj*

**physics**

The velocity-versus-time graph is shown for a particle moving along the x-axis. Its initial position is x0 = 1.8m at t0 =0s. Part A What is the particle's position at t=1.0s? Part B What is the particle's acceleration at t= 1.0s? Part C What is the particle's position at t= 3....
*February 7, 2015 by anonymous*

**differential equation or physics**

A particle moves on the x-axis with an acceleration, a=(6t-4)m/s2. Find the position and velocity of the particle at t=3 , if the particle is at origin and has a velocity of 10 m/s ms when t=0.
*March 10, 2011 by aamiraa*

**Physics**

A 0.568 kg particle has a speed of 1.57 m/s at point A and kinetic energy of 7.67 J at point B. What is its kinetic energy at A? What is its speed at point B? What is the total work done on the particle as it moves from A to B?
*October 1, 2013 by Chris*

**AP Physics C**

One dimension. In the figure, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 5.00 mA. A third particle C, of mass 62.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
*January 24, 2014 by Tabetha*

**physics**

In the figure below, two point particles are fixed on an x axis separated by a distance d. Particle A has mass mA and particle B has mass 4.00mA. A third particle C, of mass 96.0mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at what x ...
*November 17, 2010 by Alex*

**physics**

a particle covers 1/2 distance between A and B with a velocity V0. during 1/2 of the time required to cover the remaining distance the particle moves with a velocity V1 and rest moves with a velocity V2. find the average velocity of the particle
*April 14, 2015 by anubhab*

**Physics**

A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical energy of the oscillator...
*November 30, 2010 by Greg*

**Physics**

A particle of mass m is shot with an initial velocity vector v i and makes an angle θ with the horizontal, as shown below. The particle moves in the gravitational field of the Earth. (makes a shape of a parabola)Find the angular momentum of the particle about the origin ...
*March 4, 2010 by emath*

**Calculus**

a particle starts at time t = 0 and moves along the x axis so that its position at any time t>= 0 is given by x(t) = ((t-1)^3)(2t-3) a.find the velocity of the particle at any time t>= 0 b. for what values of t is the velocity of the particle negative? c. find the value ...
*September 10, 2009 by Lauren*

**Work**

A 75kg particle is moving to the left at 29m/s . How much work must be done on the particle to cause it to move to the right at 46m/s ?
*November 28, 2012 by Anonymous*

**Physics**

At t=0 a particle starts from rest at x=0, y=0 and moves in the xy plane with an acceleration a=(4.0i+3.0j)m/s^2. Determine (a) the x and y components of velocity, (b) the speed of the particle, and (c) the position of the particle, all as a function of time. (d) evaluate all ...
*September 12, 2013 by Elizabeth*

**physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find the ...
*September 22, 2009 by jeff*

**Physics**

A 0.150 kg particle moves along an x axis according to x(t) = -13.00 + 2.00t + 3.50t2 - 2.50t3, with x in meters and t in seconds. In unit-vector notation, what is the net force acting on the particle at t = 3.45 s? I tried solving using s=Vit + (.5)at^2 but I can't find the ...
*September 22, 2009 by richard*

**Mathematics**

a particle moves in a straight line such that its position x from a fixed point 0 at time 't' is given by x= 5 + 8sin2t + 6cos2t 1. Find the period and amplitude of the particle. 2. Find the greatest speed of the particle. Thanks
*October 20, 2012 by Candice*

**physics**

A 4.90 kg particle moves along the x axis. Its position varies with time according to x = t + 3.4t3, where x is in meters and t is in seconds. (a) Find the kinetic energy at any time t. (Accurately round any coefficient to exactly two decimal places. Use t as necessary.) K...
*November 14, 2011 by carlton*

**calculus**

The force on a particle is described 1 at a point x along the x-axis. Find the work done in moving the particle from the origin to x=3
*June 2, 2011 by Kim*

**PHYSICS(URGENT)**

A particle has a mass of 5kg. It is held at a height of 3 metres above the ground. Find: a.Its potential energy b.It’s kinetic energy when is hits the ground c.The speed with which the particle hits the ground
*March 22, 2012 by LK*

**physics**

A force is given by Fx=Ax^-3, where A=8.0 N*m^3.(a) For positive values of x,does the potential energy associated with this force increase or decrease with increasing x?(You can determine the answer to this question by imagining what happens to a particle that is placed at ...
*October 28, 2009 by Randy*

**physics**

A block is moving down an incline a distance of 5 m form point A to point B by a force F that is parallel to the incline and has magnitude 2 N. The magnitude of the frictional force acting on the block is 10 N. If the kinetic energy of the block increases by 35 J between A and...
*January 10, 2007 by Brian*

**physics**

A PARTICLE OF MASS M IS SHOT WITH an initial velocity v making an angle b with the horizontal,the particle moves in the gravitational field of the earth. find the angular momentum of the particle about the origin when the particle is at the origin ,at the highest point of its ...
*August 22, 2013 by mechanics*

**Physics**

A pendulum consist of a particle P of mass m, attached to one end of a model string of length l=2.85m. The other end of the string is attached to a fixed point O and the particle moves in a vertical circle about the fixed point. The angle made by the string with the vertical ...
*April 27, 2012 by Anonymous*

**physics**

Two point charges of 48 nC and -45 nC are held fixed on an x axis, at the origin and at x = 77 cm, respectively. A particle with a charge of 69 μC is released from rest at x = 49 cm. If the initial acceleration of the particle has a magnitude of 123 km/s2, what is the ...
*January 14, 2011 by Anonymous*

**physics-help please........**

The momentum and the kinetic energy of particle A is eight times and nine times the momentum and the kinetic energy of particle B, respectively. What is the ratio of the mass of particle A to that of particle B?
*October 30, 2011 by lost*

**physics**

a particle moves under the effect of force f2 from x=0 to x=4 of the work done by force
*August 31, 2014 by ashish *

**Physics**

A 0.38-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. (a) What is its kinetic energy at A? J (b) What is its speed at point B? m/s (c) What is the total work done on the particle as it moves from A to B?
*September 27, 2011 by Anonymous*

**Physics**

Question: particle J with zero initial mass and X energy accelerates from a static start to 'C' (light speed) in a time frame of N and mass increases 10 to the 28th power per nanosecond- -What is the mass on particle J? -What is the energy of particle J?
*January 16, 2013 by Dan*

**physics-speed**

i need help with this one thanks A particle starts from rest and is acted on by a net force that does work at a rate that is proportional to the time t. The speed of the particle is proportional to: a. sq. root t b. t c. t^2 d.1/sq. root t e. 1/t Work done is proportional to ...
*August 7, 2007 by Damon*

**Physics?**

In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 2.0 MeV heading directly for a gold atom (charge +79e). The alpha particle will come to...
*July 6, 2012 by David*

**physics**

In Rutherford's scattering experiments, alpha particles (charge = +2e) were fired at a gold foil. Consider an alpha particle, very far from the gold foil, with an initial kinetic energy of 3.3 MeV heading directly for a gold atom (charge +79e). The alpha particle will come to ...
*July 7, 2012 by mdave*

**physics**

The speed -time graph of a particle moving along a fixed direction is shown below.obtain the distance travelled by the particle between t=0 and t=10 s.what is the average speed of the particle over this interval?
*October 23, 2010 by soya.*

**Physics**

A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of (3.0 – 2.0 ˆi ˆj ) m/s2. At the instant the particle moves back across the x axis (y = 0), what is the value of its x coordinate?
*September 29, 2008 by Lee*

**calculus**

A particle moves in a straight line under a force such that its displacement s(t), in metres, at time t seconds, is given by s(t) = t3 − 5t2 + 3t +15 Find the time at which the particle is at rest?
*May 23, 2013 by Mat*

**physics**

A charge moves a distance of 1.4 cm in the direction of a uniform electric field having a magnitude of 244 N/C. The electrical potential energy of the charge decreases by 108.3 × 10−19 J as it moves. Find the magnitude of the charge on the moving particle. The electrical...
*February 8, 2013 by EMily*

**Calculus**

Hi! I need help with this problem: For 0(smaller or equal to) t (smaller or equal to) 9, a particle moves along the x-axis. The velocity of the particle is given by v(t)= (sin pi/4 t). The particle is at position x= -4 when t=0. a) For 0 (smaller or equal to) t (smaller or ...
*December 11, 2014 by Dana*

**Calculus**

A particle starts at the point (5,0) at t=0 and moves along the x-axis in such a way that at time t>0 its velocity v(t) is given by v(t)= t/(1+t^2). a). Determine the maximum velocity of the particle. Justify your answer. b). Determine the position of the particle at t=6. c...
*January 29, 2014 by Rasheda*

**physics**

An alpha particle, the nucleus of a helium atom, is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle from the positive x axis direction. If the proton is initially far enough away to have no potential ...
*September 29, 2008 by alexis*

**physics mc question!!!!HELP **

Question # 1 : It a particle increases its speed by a factor of 2, what happens to the kinetic energy? a)doubles b)cuts in half c)increases by a factor of 4 d)depends on whether or not work is done on the particle Question # 2: An object falling near the surface of the Earth a...
*May 22, 2012 by lilly*

**physics**

A 33 g particle is moving to the left at 22 m/s. How much work must be done on the particle to cause it to move to the right at 46 m/s?
*October 17, 2010 by kollin*

**Physics**

A 10 g particle is moving to the left at 20 m/s. How much work must be done on the particle to cause it to move to the right at 46 m/s?
*February 16, 2012 by Hayden*

**physics**

A 75 particle is moving to the left at 29 . How much work must be done on the particle to cause it to move to the right at 46 ?
*November 28, 2012 by Anonymous*

**calculus**

4. A particle starts at the point (5, 0) at t = 0 and moves along the x-axis in such a way that at time t > 0 the velocity is given by v(t)=t/(1+t^2) a. Determine the maximum velocity attained by the particle. Justify your answer. b. Determine the position of the particle ...
*March 25, 2012 by Tiffany*

**Physics**

A particle with a mass of 1.55 kg is acted on by a force Fx acting in the x-direction. If the magnitude of the force varies in time as shown in the figure below, determine the following.
*January 12, 2015 by Anonymous*

**physics**

(a) What is the gravitational potential energy of a two-particle system with masses 5.4 kg and 5.0 kg, if they are separated by 1.3 m? If you triple the separation between the particles, how much work is done (b) by the gravitational force between the particles and (c) by you...
*January 3, 2011 by kelly*

**physics**

A particle (m=3*10^-6 g, q=5*10^-6 C) moves in a uniform magnetic field given by (60j) mT. At t=0 the velocity of the particle is equal to (30j - 40k)m/s. The subsequent path of the particle is? I know that the answer is: helical with a 40-cm radius. But i dont know the ...
*July 1, 2014 by monique*