1. Physics Again

    How do you calculate the coefficient of friction, if it is not given to you? What would the formula be? It is a measured value. Force friction= mu*normal force. That is the usual method of solving for mu.

    asked by Josiah on November 30, 2006
  2. physics

    In a television picture tube, electrons are accelerated by an electric field having a value of 1*10^5 N/C. Find the force on an electron. so i know i use E=F/q to find the force but i need the q to get it how do i do that??

    asked by kailey on February 3, 2008
  3. physics

    A particle of mass m = 0.3 kg is acted upon by a force so that its position vector, r(t)=2.0t^2(i)- 5.0t^2 (j) +t^2 (k) where t is in s. What is the (instantaneous) power delivered by this force to the particle at time t = 2.0s?

    asked by K on December 10, 2015
  4. Science

    An Olympic bobsledder pushes a 200 kg bobsled at 8 m/s. If the man pushes with a force of 1200 N, how much force of friction is present?

    asked by Kyle on November 8, 2011
  5. Physics

    In the figure take q1 = 22uC and q2 = 20u. The force on q_1 points in the - x direction, What is the magnitude of the force on q_1? I don't know where to start, can someone help me?

    asked by Adam on August 13, 2009
  6. Physics 30

    Two point charges objects produce an electric force on each other of 3.6x10^-2 N. What is the electric force between them if the distance is increased five times?

    asked by elaine on February 6, 2016
  7. physics

    a toy rocket is fired upward with a net force of 50N. Because of this force it accelerates at 25m/s^2. What is the mass of the rocket?

    asked by kim on November 16, 2013
  8. Physics


    asked by HAJARA on May 16, 2019
  9. physics

    a boy is pulling on a wagon with a force of 70 N directed at an angle of 30 degrees to the horizontal. What force is the wagon being pulled horizontally?

    asked by Anonymous on November 11, 2010
  10. Physics

    A particle of mass m is subjected to a force acting in the x-direction. Fx = (3.2 + 0.55x) N. Find the work done by the force as the particle moves from x = 0 to x = 4.5 m. 1

    asked by Gina on September 21, 2010
  11. physics

    A hot stell ball of mass 1 kg is dropped into a 4 L bucket of water at room temperature (70 degrees F). If the system reaches an equilibrium temperature of 320 K, what was the initial temperature of the steel ball before it was dropped into the water? Cp

    asked by Meghan on March 19, 2011
  12. physics

    gravational force deimos, a satellite of amrs, has an average radius of 6.3 km. If the gravational force between deimos and a 3.0 kg rock at its surface is 2.5x10(-2)N..what is the mass of deimos ? Use the Universal Law of gravitation: Force= G

    asked by arielle on November 28, 2006
  13. Physics HELP!!!!!!!!

    For the normal force in Figure 5.21 to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 3.1 m and that the driver

    asked by Mary on February 21, 2007
  14. physics

    A car that weighs 1.5 × 10^4 N is initially moving at a speed of 43 km/h when the brakes are applied and the car is brought to a stop in 16 m. Assuming that the force that stops the car is constant, find (a) the magnitude of that force and (b) the time

    asked by monnie on October 8, 2010
  15. Math

    Can you please help me with a math problem Suppose the ball was 3.24 feet above ground when it was hit, and that it reached a maximum height of approximately 102.51 feet when it had traveled a ground distance of approximately 214.26 feet. The ball lands

    asked by Armun on January 23, 2012
  16. Physics

    A block with a mass of 5.0 kg is held in equilibrium on an incline of an angle with a measure of 30.0 degrees by the horizontal force F. Find the magnitude of F. Find the normal force exerted by the inbline on the block. (disregard friction) Well, I don't

    asked by Becca on November 14, 2006
  17. physics

    A person on a 50-meter tall building throws a ball straight up into the air. This ball has an initial velocity of 20 m/s. From this: 1) Find the time it would take to reach the Max Height 2) Find the actual Max Height (In Meters) 3) Find the time it takes

    asked by Miguela on September 16, 2009
  18. physics

    A ball rolls horizontally off the edge of a tabletop that is 1.0m high. It strikes the floor at a point 1.5m horizontally away from the edge of the table. Find the speed when the ball left the table. Find the time it takes to fall 1 meter. Then, you have

    asked by Jean on March 11, 2007
  19. physics

    14)The cable of the elevator you are riding in breaks and the elevator begins to freefall at terminal velocity to the ground. Why would jumping up right before impact still not help you survive? A)Because your overall inertia is down B)Because you would be

    asked by Jon on April 1, 2008
  20. science

    How long does it take the ball in problem 5 to travel 15 meters after being played? Neglect the gravitational effect, and suppose the ball travels along a straight line and assume a speed of 24 m/s. A racecar driver steps on the gas, and his car travels 16

    asked by bittubeniwal on June 17, 2013
  21. Physics

    Two electrostatic point charges of +60.0 uC and +50.c uC exert a repulsive force on each other of 175 N. What is the distance between the two charges? So let's say I use Coulomb's law would the repulsion of 175 N be considered the equivalent of the

    asked by Pablo on January 17, 2011
  22. physics

    A 17 kg block is dragged over a rough, hor- izontal surface by a constant force of 170 N acting at an angle of angle 32.1◦ above the horizontal. The block is displaced 33.9 m, and the coefficient of kinetic friction is 0.199. a] find the work done by

    asked by mary on November 14, 2010
  23. Physics

    1. What is the kinetic energy of a 0.50 g insect traveling in a straight line at 5.0m/s? a. 6.25j b. 1.25j c. 5.0j d. 250j Is the answer A?? 2. Mechanical energy is defined as the sum of which of the following? a. kinetic, potential and radiant energy b.

    asked by N. on March 14, 2015
  24. Physics

    A man is dragging a trunk up the loading ramp of a mover's truck. The ramp has a slope angle of 20.0 degrees, and the man pulls upward with a force of magnitude 377N whose direction makes an angle of 30.0 degrees with the ramp.Find the horizontal component

    asked by Tee on September 21, 2008
  25. physics

    I need help attacking this problem A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's

    asked by Edward on September 21, 2014
  26. Physical Chemistry

    Let's say we are given 1.0 mol of an ideal gas, and we are given a starting temperature, and and initial pressure the gas exerts. We are now told that the gas expands adiabatically until it reaches some other pressure, p2. How do we calculate w and dH for

    asked by AJ on March 26, 2008
  27. physics

    You are pushing a 30-kg wooden crate across the floor. The force of sliding friction on the cate is 90 N. How much force, in newtons, must you exert on the crate to keep it moving with constant velocity?

    asked by Sharon on October 17, 2011
  28. physics

    Two point charges totaling 9.00 µC exert a repulsive force of 0.300 N on one another when separated by 0.596 m. (A) What is the charge on each? (B) What is the charge on each if the force is attractive? smallest charg

    asked by Justin on February 28, 2013
  29. em

    Answers for Two Forces Act At Angle Of 120 Degrees The Bigger Force Is 60 Degree M And Resultant Is Perpendicular To The Smaller One Find The Smaller Force

    asked by ramadevi on August 7, 2012
  30. Science Physics

    Madison pushes with a 160-N horizontal force on a 20-kg crate of coffee resting on a warehouse floor. The force of friction on the crate is 80 N. Show that the acceleration is 4 m/s2.

    asked by Peg on May 17, 2014
  31. Physics

    A 10 kg block sits on a flat surface whose μs is 0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part (a) what will the blocks acceleration be???

    asked by Lianne on August 26, 2012
  32. Physics

    A 10 kg block sits on a flat surface whose μs=0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part a. what will the blocks acceleration be?

    asked by El on August 26, 2012
  33. applied maths

    a force 'P' acts on a bodyat an angle theta to a horizontal line 'OX'. P,together with a pull of 1.5kn at 30degrees to, and below 'OX', has the same effect as a force of 5kn at 45degrees to and above 'OX'. i'm so confused!

    asked by Rob on September 19, 2010
  34. Physics

    A 0.60-kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 9.0 N for a distance of 2.0 m. How much farther would the force have to act for the block to have 72 J of kinetic energy?

    asked by Juan on September 20, 2017
  35. Atakpa science college zaki-biam

    Two identical charges repel each other with a force 0.1mN and are moved additional 5.0cm a part the repulsive force is reduced to 25 x 10^-6N, (a) How far were they originally (b) what is the size of the charges

    asked by Terzungwe nicholas on June 25, 2015
  36. science

    A force of 16.0 newtons is sufficient to set a box that is at rest into motion. If the coefficient of static friction is 0.380, what is the normal force acting on the box?

    asked by kevin on June 24, 2015
  37. physics

    A block of mass m = 14 kg is pressed with a horizontal force F against a frictionless ramp of angle θ = 78∘. What is the magnitude of the normal force exerted by the incline surface on the block?

    asked by ss01 on October 1, 2013
  38. Physics

    Hello, If I need to find out how long it takes for an object acted on by a force takes to change speed by 1.0m/s^-1 and I know the magnitude of the force can I use the following equation? a=v2-v1/t in order to establish the time taken?

    asked by Anon on November 1, 2017
  39. physics

    Harper applies a force of 92 N on a heavy box by using a rope held at an angle of 45 degrees with the horizontal. What are the vertical and horizontal components of the 92N force?

    asked by Staci on March 12, 2013
  40. Phyics

    Force of 18000N is gerenated by the engine of traine having is wages of mass 1000kg each and 2000N is lost against.Calcute accelration $ force impaned on each wages.

    asked by Nikita on September 26, 2016
  41. Physics

    A light spring of force constant 8N/m is cut into two equal parts and then are connected in parallel the equivalent force constant will be what of the system. Solve this problem

    asked by Shadab on June 8, 2016
  42. College Physics

    Suppose the Eskimo is pushing the same 50.0-kg sled across level terrain with a force of 51.5 N. If he does 3.85 102 J of work on the sled while exerting the force horizontally, through what distance must he have pushed it?

    asked by Meghan on October 6, 2012
  43. Physics

    What can be said about the electric force between two charged particles? a. it is repulsive for unlike charges. b. it varies as 1/r. c. it depends only on the magnitudes of the charges. d. it is much, much greater than the attractive gravitational force.

    asked by Destiny on April 30, 2017

    Object A experiences a gravitational force due to object B. How would that force change if the separation distance is halved, mA triples, and mB is reduced to one quarter of its original value?

    asked by Jen on March 15, 2016
  45. physics - power(3)

    A force of 48 N pushes a 2 kg object initially at rest a distance of 3m along frictionless horizontally surface. Find: A- The work done on the object. B- The power of the applied force.

    asked by Mota on January 16, 2010
  46. Physics- Equilibrant Force

    Two movers are pushing a large crate with a force of 50.0 N each. One pushes north, the other east. What is the equilibrant force? a. 71 N Southwest b. 50 N Northeast c. 100 N Southeast d. 71 N Northeast

    asked by MM on November 21, 2016
  47. physics

    A force of 30.0 N is required to start a 3.8 kg box moving across a horizontal concrete floor If the 30.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction?

    asked by miya on November 10, 2009
  48. physics

    The 1 kg standard body has an acceleration of 2 m/s^2 at 56 degrees to the positive direction of the x axis. What are the x and y components of the net force on it? What is the net force of the unit-vector notation?

    asked by Courtney on February 17, 2012
  49. calc

    a wrench is rotated with torque of magnitude 175 N (M). the force is applied 45 cm from the pivot point at an angle of 48 degrees. what is the magnitude of the force, to one decimal place?

    asked by Emily on July 15, 2016
  50. physics

    A helicopter weighs 3920 newtons, caculated the force on it if it is ascending up at a rate of 2m/s squre ,what wil b force on helicopter if it is moving up with the constant speed of 4m/s .

    asked by sam on September 15, 2014
  51. Physics

    Three identical blocks, fastened together by a string, are pulled across a frictionless surface by a constant force. Compare the tension on string A to magnitude of applied force F.

    asked by Shaila on August 5, 2010
  52. physics

    A force of 36.1 N is required to start a 4.0 -kg box moving across a horizontal concrete floor. If the 36.1 N force continues, the box accelerates at 0.71 m/s^2. What is the coefficient of kinetic friction?

    asked by Kim on October 1, 2010
  53. 12th grade physics

    A person pulls a wagon through thick grass with a force of 800 N. The angle that the handle makes with the ground is 35. How much force moves the wagon forward?

    asked by Kayin on September 26, 2011
  54. Physics

    Object A experiences a gravitational force due to object B. How would that force change if the separation distance is halved, mA triples, and mB is reduced to one quarter of its original value?

    asked by lost in life on March 28, 2016
  55. 11th grade

    a race car travels along a raceway at a constant velocity of 200 km per hour.what horizontal force acts and what is the net force acting on the car?

    asked by Anonymous on December 20, 2010
  56. physics

    an unknown force pushes an automobile of mass 1700kg. The automobile is ground level and accelerates at a rate of 3 meters per second squared.what is the magnitude of the force?

    asked by tg on September 3, 2011
  57. physics

    A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate?

    asked by roman on January 29, 2014
  58. Physics 11

    Show that the minimum force required to pull a wheel if Radius R and mass M over a step of height h, given R> h when the force is applied at the top of the wheel is F = Mg sqrt(h/2R-h) Thank you so much

    asked by Raylene on November 7, 2013
  59. physic

    A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

    asked by joy on February 5, 2018
  60. physics

    A horizontal force of magnitude F = 176.0 N is used to push a box of mass m = 9.0 kg from rest a distance d = 15.0 m up a frictionless incline with a slope θ = 31.0°. 1) How much work is done by the force on the box? W F =

    asked by Anonymous on October 9, 2012
  61. physics

    suppose a box is sliding along the floor,and friction is resisting its motion with a force of 160n.how much force do you need to exert to keep the box moving at a constant velocity?

    asked by lisa on May 2, 2012
  62. Physics

    Three fixed charges are located along a line. The - 2 C charge is 10cm to the left of the +5 C charge and the -4 C charge at 4 cm to the right of the +5 C charge. a.what is the force exerted on the -4 C by the +5C charge? b.what is the force exerted on the

    asked by Jennifer on June 21, 2012
  63. Physics

    A ball of moist clay falls 10.4 m to the ground. It is in contact with the ground for 20.5 ms before stopping. (a) What is the average acceleration of the clay during the time it is in contact with the ground? (Treat the ball as a particle.) m/s2 (b) Is

    asked by Allie on October 21, 2012
  64. physics..

    im not completely sure im right with this question a lawn spreader is pushed across a lawn by applying a force of 95N along the handle that makes an angle 60 degrees with the horizontal. a- what is the horiz. and vert. comp. of the force. b- when the

    asked by hi, on January 17, 2008
  65. Physics bobpursley

    hello ok i realized what you meant. =) An object of mass M = 921 g is pushed at a constant speed up a frictionless inclined surface which forms an angle θ = 50o with the horizontal. The normal force acts perpendicular to the slope. The slope is the

    asked by Nala on October 14, 2009
  66. Physics Help Please!!!! Urgent!!

    In an experiment, a boar (2600 kg) slows down from 11 m/s to 8 m/s in 5 sec when the engine is stopped. a) Determine the drag force. b) Using this information, what is a good approximation of the forward thrust force needed to keep the boat cruising at a

    asked by Jesicca on October 15, 2014
  67. Physics

    Assume that 60.0 m/s wind (during a hurricane) is blowing past a 1.50 m by 1.50 m glass windo in a house. Find (a) the pressure difference "delta"P=P(in)-P(out) and (b) the force (Magnus force)tending to blow this window outward. Let the air density p=1.20

    asked by Lashawn on April 24, 2013
  68. physics

    captain iplanet measures the magnetic forces on a proton which is vertically falling at 1996 m/s at the equator (take the earth's field to be .4 Gauss horizontal and pointing northward). what force would she measure? Give both force and direction.

    asked by fatih on March 9, 2012
  69. physics

    The block in the figure below lies on a horizontal frictionless surface and is attached to the free end of the spring, with a spring constant of 60 N/m. Initially, the spring is at its relaxed length and the block is stationary at position x = 0. Then an

    asked by henry on October 25, 2009
  70. trig

    A force of 50 pounds acts on an object at an angle of 45°. A second force of 75 pounds acts on the object at an angle of -30°. Find the direction and magnitude of the resultant force.

    asked by Cam on December 14, 2011
  71. Physics

    a see saw is balanced. left hand side is 3m long and has an applied force of 4N the righth hand side is 6m long and has an unknown force applied. what is that force?

    asked by Cameron on November 29, 2015
  72. physics

    A crate with a mass of 80 kg glides through a space station with a speed of 2.5 m/s. An astronaut speeds it up by pushing on it from behind with a force of 210 N, continually pushing with this force through a distance of 8 m. The astronaut moves around to

    asked by Anonymous on April 3, 2014
  73. Physics

    A mass m1 = 4.1 kg rests on a frictionless table and connected by a massless string to another mass m2 = 5.9 kg. A force of magnitude F = 32.0 N pulls m1 to the left a distance d = 0.83 m. 1) How much work is done by the force F on the two block system? 2)

    asked by Drew on January 2, 2013
  74. physics

    tank of water with L=6m, W=3m, H=4m. 1) Find the force on the bottom of the tank from water. (ignore atmosphere pressure). 2) If the door to the tank is 1.5m by 1.5m and it is 2.25m (center bottom)from the edge of the tank, what is the force on the door

    asked by nick on September 14, 2007
  75. physics

    The justice league is playing baseball with 5kg rockets. The flash's top speed is 300m/s and a home run requires a 180m run. The rockets accerlate at 1200m/s^2, Superman catches it 30m from home, and decelerates it with 2700N. Once he stops the rocket, he

    asked by karly on March 30, 2012

    If it take a force of 10,000N to accelerate a car with a mass of 1250KG at a rate of 6m/s^2, what is the force of friction acting against the car?

    asked by Jared on December 11, 2012
  77. physics

    Spring of 20cm extend to 30cm under a force of 10N.what will be its total length when extended by a force of 10N?

    asked by polao on April 20, 2016
  78. Physics

    A force of 40N stretches a wire through 3cm.What force will stretch it through 5.0cm and through what length with a 100N stretch it?

    asked by Ibrahim on July 19, 2018
  79. Physics

    Does an apple exert a gravitational force on the earth? If so, how large a force? Consider an apple (a) Attached to a tree and (b) falling.

    asked by Stuck on November 6, 2016
  80. Physics

    How much work is done by the horizontal force F = 150 N on the 18 Kg block when the force pushes the block 5.0 M up along the 32 degree friction-less incline?

    asked by Anyi on April 1, 2013
  81. physics....

    How is it possible for an object to obtain a larger impulse from a smaller force than from a larger force? i have no clue how this can happen .....it seems impossible ..

    asked by dreamygirl on May 10, 2012
  82. physics

    force has the dependence Fx = -ax4 on the position x, with the constant a = 25.0 N/m4. The work performed by this force when the position of its point of application changes from 0.75 m to 1.25 m is

    asked by madhu on April 30, 2016
  83. Physics

    How much work is done by the horizontal force F = 150 N on the 18 Kg block when the force pushes the block 5.0 M up along the 32 degree friction-less incline?

    asked by Anon3 on March 31, 2013
  84. physical science

    when an astronaut orbits the earth, and is falling in a circle around the Earth, is he/it creating a CENTRIFUGAL force or a CENTRIPETAL force?

    asked by anonymous on December 31, 2010
  85. physics....

    How is it possible for an object to obtain a larger impulse from a smaller force than from a larger force? i have no clue how this can happen .....it seems impossible ..

    asked by dreamygirl on May 10, 2012
  86. physics

    A box of mass 10 kg is pushed across the floor with a force of 25 N. A 2 N frictional force opposes the motion. What is the acceleration of the box?

    asked by Kareem on January 15, 2015
  87. Science

    A 8.8-kg object is moving at 5.3 m/s. A 7.4-N force is applied in the direction of motion and then removed after the object has traveled 4.7 m. The work done by this force is:

    asked by Ahmad on November 23, 2016
  88. physics need help

    An object , constrained to move along the x-axis is acted upon by a force F(x)=ax + bx^2 where a=5N/m , b=-2m/s The object is observed directly from x=1m to x=3.0 m... How much work is done by the force?

    asked by Anonymous on October 20, 2016
  89. Dyanamics

    A force acting on the body of mass 10kg changes its velocity from 30 miles/hr to 45 miles/hr find the impulse of the force...

    asked by vinod on December 6, 2013
  90. PHYSIC

    A block displacement causs of a force in a horizontal surface is 13m and the work done by the force on the block .6 joules .

    asked by karl on August 20, 2016
  91. Physics (is my work correct????)

    A tension force of 2.50 N acts horizontally on a 2.00 kg block. The block accelerates at 0.750 m/s2. What is the force of kinetic friction? 2 x .75, = 1.5N (2.5 - 1.5) = 1N?????

    asked by Jake on January 15, 2015
  92. physics

    Two spacecraft in outer space attract each other with a force of 45 N. What would the attractive force be if they were \frac{1}{5} as far apart? F_{attractive} = _____________N (no rounding up)

    asked by Melissa on March 3, 2014
  93. science

    jason weighs 10kg. the force of gravity is 9.8 m/s2. what is the amount of force jason is applying to the ground when standing?

    asked by savannah on October 6, 2011
  94. Science

    An object accelerates at 7.5m/s^2 with a force of 25N west being applied to it and there is a frictional force of 13N. What is the mass of the object

    asked by Taylor on November 1, 2016
  95. Physics: Equilibrium and Inclined Planes

    Two forces act on an object. One force is 8.0 N horizontally and the second is 10.0 N vertically. Find the force that will produce equilibrium for the object.

    asked by Anayeli on October 28, 2007
  96. physics

    A student pulls a backpack weighing 70 N a distance of 50m with a force 25N What amount of force does the student do?

    asked by Noah on November 14, 2009
  97. physics

    Two charges separated by 1 meter exert a 1 N force on eachother. If the magnitude of each charge is doubled, the force on each charge is?

    asked by Jenny on April 10, 2010
  98. Physics

    A force of 50 N accelerates a 5.0 kg block at 6.0 m/s2 along a horizontal surface. (a) What is the frictional force acting on the block? (b) What is the coefficient of friction?

    asked by HanuPhysics on October 21, 2012
  99. science

    A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has:

    asked by john on February 20, 2013
  100. Physics

    A force of 5N and a force of 15N acting on an object can produce the following net forces except a. 20N b. 15N c. 10N d. 5N

    asked by Carolyn on February 6, 2013