physics please HELP !

74,851 results, page 99
  1. physics

    A 10 kg mass is sitting on a 25 degree incline. A constant force of 49N is applied up the plane. The coefficient of static friction is .25. Does it go up or down or does it stay put?
  2. physics

    Details and assumptions Note: Points ABCDE are labeled for easy reference if you need to use some combination of them in a solution. Request clarification or dispute Print this
  3. Math/physics

    An 6 x 8 wood column is 17 feet tall and is loaded with 40 Kips. Will it buckle (K = 1.0)? How do I set this up and solve? Please show steps. I am confused and do not know how to start. Thank you.
  4. Physics

    Examine the table below as the spearation distance is doubled ow much does the electrostatic forces decrease? 1 20.0 Cm 0.1280N 2 40.0 cm 0.0320N 3 60.0 Cm 0.0142N 4 80.0 CM 0.0080N 5 100.0 CM 0.0051
  5. physics

    A 50 kg girl runs up the stairs to a floor 6m higher in 10 s. What is her power output? P=f.dt P=(50kg x 10m/s2 x6m) __________________ 10 = 300J/s or 300 watts
  6. physics

    Three charged particles are placed at the corners of an equilateral triangle of side d = 1.40 m (Fig. 16-53). The charges are Q1 = +4.0 µC, Q2 = -7.0 µC, and Q3 = -6.0 µC. Calculate the magnitude and direction of the net force on each due to the other
  7. Physics

    A skier traveling 12.0 m/s reaches the foot of a steady upward 18° incline and glides 18.2 m up along this slope before coming to rest. What was the average coefficient of friction?
  8. Physics

    A 70.50 kg man rides a Ferris wheel with a radius of 10.3 m at a velocity of 5.00 m/s. What is the centripetal force that she experiences expressed with the correct number of significant figures?
  9. physics

    This is example question If a baseball is thrown at average 24m/s and flying 12 m/s full length of the field by 0.5s example=formula How would it change if a wind cause air resistance=
  10. physics

    A 95 N block rests on a table. The sus- pended mass has a weight of 22 N. What frictional force is required to keep the blocks from moving? Answer in units of N.
  11. physics

    A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up.. Plzz solve it
  12. physics

    What is the angular momentum of a figure skater spinning at 4.4 with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.6 , a radius of 15 , and a mass of 53 ?
  13. physics/ basic of statics

    Two forces 3kg & 5kg weight act at point making an angle 60° with each other find the magnitude & direction of the resultant
  14. Physics

    A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
  15. physics

    how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.
  16. mastering physics

    A square frame is made from four thin rods, each of length and mass Calculate its rotational inertia about the three axes shown in the figure
  17. Physics

    A body of mass m is moving a circular track of radius r with a tangential velocity V. Write an expression for *The angular momentum *The centrifugal force
  18. Physics

    A man lifts a heavy stone using a bar supported at a stationary point. Which phenomena in daily life in terms of the scientific principles
  19. physics

    A long jumper leaves the ground at an angle of 22.1◦ to the horizontal and at a speed of 10 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m
  20. physics

    A capacitor has a circular plate of radiusr=12cm that are at a distance of .2cm part.this is hooked up to 12 V battery. if this caoacitor is submerged in water what happens to the capacitance?
  21. physics

    a trench mortar fires a shell at an angle of 30 degrees with the horizontal and with a speed of 500 m/s. find its range and the maximum height it attains?
  22. Physics

    A ball thrown with a speed of 100m/s attains a height of 150m (take g=9.8 per second square). Calculate: 1. Time of flight 2. Angle of projection 3. Range
  23. physics

    A golf ball is hit off a tee at the edge of a cliff. Its x and y coordinates as functions of time are given by x = 19.4t and y = 3.72t − 4.93t2,where x and y are in meters and t is in seconds.
  24. Physics Circular Motion

    What is the maximum speed for a car to safely negotiate a 30 banked curve of 60 m radius if there is a coefficient of static friction of 0.35?
  25. mathematical physics

    Calculate the work done by a force vector F = y^2z^3i^+2xyz^3j^+3xy^2z^2k^ in moving an object along the path defined by the parametric equation x = t, y = t, z = t between the points A( t =0 ) and B( t = 1).
  26. physics help!!!

    A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
  27. physics

    t(s)=0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0 v(m/s)=0.0,4.6,8.9,13.4,18.0,22.9,27.6,32.0 find the area underneath the graph between t=2.0s and t=6.0s, i know i will have to break this down into two separate shapes, a rectangle and a triangle then add them
  28. physics

    Determine the mass of the flywheel if it is a solid disc and the dimensions are as follows: Outer diameter = 500mm Thickness = 50mm Material density = 7500 kg/m^3
  29. physics

    The New River Gorge bridge in West Virginia is a 518 m long steel arch. How much will its length change between temperature extremes -19°C and 39°C? (answer in cm)
  30. Physics Someone help please!

    An example of the neutron absorption reaction is . 1 0 n+10 5 B-->7 3 Li+ 4 2 He The rest masses of each particle in atomic mass units (u) are 1 0 n= 1 u 10 5 B=10 u 7 3 Li =7 u 4 2 He= 4 u where 1u=1.66x10^-27 kg. calculate Q Q= in MeV I have the same
  31. physics

    (a) A truck of mass 1870 kg travelling at 80 km/h braked to 55 km/h then continued at that speed. How much work was done by the brakes during that period? I just wanted to check my answer... 243334 J ??
  32. physics

    2 The instrument used for experimental determination of the value of the universal gravitational constant G is called Galilio’s telescope ballistic pendulum Newton’s balance Cavendish
  33. physics

    According to newtons 1st law , construction workers are warned not to leave their hard hats on the rear window ledge of their cars, explain why?
  34. Physics

    What is the coefficient of friction on a 221.9 gram block of wood with 150 grit sandpaper on the bottom being pulled by .392 newtons. NEED HELP IMMEDIATELY!!!!!! Please and thank you
  35. mastering physics

    Find an expression for , the tension in cable 1, that does not depend on . Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity .
  36. Physics

    Calculate the magnitude of the linear momen- tum for each of the following casesEarth (m = 5.98 × 1024 kg) moving with an orbital speed equal to 26200 m/s. Answer in units of kg · m/s.
  37. physics

    the resistance of a platinum resistant thermometer is 1.2ohms. when the measuring in Kelvin temperature of oil and 1.0ohms at the triple point of water. find T
  38. mastering physics

    Find an expression for , the tension in cable 1, that does not depend on . Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity .
  39. physics help!!

    A hypothetical spherical planet consists entirely of iron (p=7860kg/m^3). Calculate the period of a satellite that orbits just above its surface. I really can't solve this! No other information was provided. Please and thank you
  40. Physics

    A drag racer starts her car from rest and accelerates at 9.0 m/s2for the entire distance of 60.0 m. What is its speed at the end of the run? Answer in units of m/s.
  41. physics

    a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You
  42. 7th Grade Physics

    Given a homogenous liquid mixture of sodium chloride (salt) and water, what would be the best method to separate these substances? What is the process. Please explain.
  43. Physics

    An outfielder throws a 2.12 kg baseball at a speed of 114 m/s and an initial angle of 54.8 ◦ . What is the kinetic energy of the ball at the highest point of its motion?
  44. physics

    a cylindrical storage tank has a radius of 1.05m. when filled to a height of 3.79m, it holds 13500kg of a liquid industrial solvent. what is the density?
  45. physics

    An object is placed 5 cm in front of a concave lens of focal length 7 cm. Find the image location by drawing a ray tracing diagram to scale.
  46. physics

    a cylindrical vessel of length 1 m and area 1mmsq is filled with water and rotated with an angular speed of w= 20pi find the rise in temp
  47. physics

    a circular wire loop of radius 5cm lies in the xy-plane in a magnetic field defined by B=-(4t^2+3t).determine the voltage across the resistor at time t=2s
  48. physics

    a cyclist moving with constant speed 10m/s develop a power of 400 watt. Calculate the average force exerting on the bicycle
  49. physics

    the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantities
  50. physics

    a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z.
  51. Physics

    Two masses are connected by a string as shown in the figure. Mass = 3.4 rests on a frictionless inclined plane, while = 5.5 is initially held at a height of = 0.90 above the floor.
  52. physics

    a man exerts 200 N force on a 18 kg lawnmower handle as he pushes it at constant velocity . the hantle makes an angle os 50 degrees with the ground.
  53. physics

    Lars, of mass 75.6 kg, has been working out and can do work for about 2.0 min at the rate of 0.980 hp (731 W). How long will it take him to climb three flights of stairs, a vertical height of 11.0 m?
  54. mathematical physics

    Calculate the work done by a force Vector F = y^2z^3i^+2xyz^3j^+3xy^2z^2k^ in moving an object along the path defined by the parametric equation x=t, y=t, z=t. Between the point A(t=0) and B(t=1).
  55. Fun Physics

    A box is given a push up a 16.1° incline. When it reaches the bottom again it is only going 0.59 its original speed. Find the coefficient of kinetic friction. *I know the answer is .06 but I don't know how!
  56. Physics

    Calculate the work done on the system when 1.00 mol of gas held behind a piston expands irriversibly from a volume of 10.0dm^3 against an external pressure of 1.00 bar?
  57. Physics

    When a solar flare erupts on the surface of the sun, how many minutes after it occurs does its light show up in an astronomer's telescope on earth? I am totally confused..help!
  58. physics

    How much heat is needed to be supplied to a 3.5 kg cylindrical rod if its volume changes by 1/4 of its original size? Assume that it is initially at 20K and that c = 2 cal/g.C and α = 8x10^2/C
  59. physics..

    What is the maximum height achieved if a 0.800 kg mass is thrown straight upward with an initial speed of 40.0 m·s–1? Ignore the effect of air resistance.
  60. physics

    A 0.13 kg ball of dough is thrown straight up into the air with an initial speed of 18 m/s. The acceleration of gravity is 9.81 m/s2 .What is its momentum halfway to its max- imum height on the way up?
  61. physics

    points A {at(2,3)m} and B {at(5,7)m} are in a region where the electric field is uniform and given by vector E=(4i+3j) N/C. What is the potential difference Va-Vb in volts? a. 23 b. 27 c. 30 d. 24 e. 11 i think the formula may be ds=dxi+dyi but even with
  62. physics

    a gun can shell targets 15 km away. find (a)the min launch speed needed to achieve that range (b) the shells flight time under these conditions
  63. Physics

    Calculate the total heat content of 10 kg of ice at -23°C. (Hint: absolute zero is -273°C.) Be mindful of significant figure rules for both multiplication and addition.
  64. Physics

    a girl touches a Van de graff generator and slowly moves away from the dome why when moving back to touch it again she recives a strong shock why ?
  65. Physics

    Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle as in the figure above. Find the magnitude and direction of the electric field at the position of the 2.2 µC charge.
  66. physics-check my answer

    in what position can a current-carrying loop of wire be located in a magnetic field so that it doesn't tend to rotate? -I think it would be perpendicular
  67. physics

    suppose the diver vaults off the springboard, leaving it with an initial speed of 3.50 m/s upward. use energy conservation to find his spped when he strikes the water.
  68. physics

    If a wire has a resistance of 132ohms a length of 110cm and an area of cross- sectional of 0.00415cm square find the resistivity of the material of which it is made
  69. physics

    HELP! ok here it goes... Compute the resultant and the equilibrant of the following system of coplanar concurrent forces: 100lbs, 30degrees; 141.41lb, 45degrees; 100lb, 240degrees.
  70. physics

    A hypothetical planet has a radius 1.1 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface? Express your answer using two significant figures.
  71. Physics

    There is an 8 meter tall hill with a circular radius of 20 meters. What is yhe minimum speed a car needs to momentarily lose contact with the road?
  72. math/physics

    5. Consider a particle moving counter-clockwise around the ellipse x^9/9 +y^2/4 = 1. Find a relationship between dy/dt and dx/dt What are the rates of change of y and x at the times when the other variable isn't . changing at all?
  73. college physics

    Three identical charges (q = +5.0mC) are along a circle with radius of 2.0m at angles of 30, 150, and 270 degrees. What is the the resultant electric field at the center?
  74. physics

    A ball is thrown vertically upward with a speed of 24.7 m/s from a height of 2.0 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of s
  75. physics HELP

    A block a mass of .113 kg is slid horizontally with a acceleration of 2.612 m/s^2 What is the kinectic force and the coefficient of friction. Please show the steps in getting these answers,
  76. Physics 1

    A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s2. To what height does it rise? Help meh please.
  77. Physics

    Determine the activity of 1.11 g of 88Ra226 (a) in disintegrations per second (Bq) (b) and in Curies (Ci). The half-life is 1600 yr (1 yr = 3.156 x 10^7 s). 1 Ci is equal to 3.7 x 10^10 Bq. I keep getting the wrong answer and use the equation H=kNo
  78. physics

    A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E .
  79. physics

    A hoop of radius 0.50 m and a mass of 0.20 kg is released from rest and allowed to roll down an inclined plane. How fast is it moving after dropping a vertical distance of 3.0 m ?
  80. Science:Physics

    Nilo drives is van with an average velocity of 45.0 km/h along the North Expressway. How long will it take him to drive 350 km on a perfectly straight highway
  81. physics

    At a certain undisclosed place (probably not on Earth) an Atwood's like experiment gives the graph of 1/t2 vs Δm the slope is 3.8 (in 1/(kg s2). One also knows that h=1.3m, total mass =0.8kg and I/r2 = 0.08kg. what is the gravitational acceleration is
  82. physics

    calculate the acceleration of 2kg block on a horizontial friction-free air table when you exert a horizontal net force of 20N.
  83. physics

    an arresting device on a carrier deck stops an airplane in 1.5s. the avg. acceleration was 49 m/s2. what was the stopping distance? what was the initial speed? so i think v2=0, t=1.5, a= 49, so i need d and v1. i got v1=73.5 m/sec and d= 55 m. i took
  84. physics

    A ball is thrown vertically upward with a speed of 27.3 m/s from a height of 2.1 m. How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s
  85. physics

    The roller-coaster car shown in Fig. 6-41 (h1 = 50 m, h2 = 11 m, h3 = 30 m), is dragged up to point 1 where it is released from rest. Assuming no friction, calculate the speed at points 2, 3, and 4
  86. Physics

    A hiker shouts towards a vertical cliff 305 meters away. The echo is heard 1.85 seconds later. How fast did the sound wave travel in air?
  87. physics

    to tighen a nut you exert 15N of force on wrench, which is a distance of 0.50m from pivot point. calculate amonut of torque produced...
  88. physics

    A man whose mass is 75kg walks up a stairs each 20cm high in5seconds.calculate the power expended in watts.[assume g=10m\s2
  89. physics

    A baseball pitcher throws a pitch with an initial velocity of 39.9 m/s, directed horizontally. How far does the ball drop vertically by the time it crosses the plate 18.0 m away?
  90. physics

    Bob heads out into a lake at an angle of 27◦ with respect to the shore. If his boat is capable of a speed of 1.3 m/s, how far from land will he be in 2 min and 28 s ? Answer in units of m.
  91. Physics

    A ball is thrown vertically upward with a speed of 26.1 m/s from a height of 2.1 m.How long does it take to reach its highest point? The acceleration of gravity is 9.81 m/s2. Answer in units of s
  92. Physics

    How fast (in rpm) must a centrifuge rotate if a particle 8.55 cm from the axis of rotation is to experience an acceleration of 1000 g's? (use 9.8 m/s^2) You may assume constant angular velocity.
  93. physics

    four forces 8N,6n,2n and 4n act on a point O in the directions north,east,south and west respectively,find the magnitude of their result and the direction of their resultant force.
  94. physics

    The asteroid Ceres has a mass 7.061 × 1020 kg and a radius of 505.2 km. What is g on the surface? The value of the universal gravitational constant is 6.67259 × 10−11 N · m2/kg2.
  95. PHYSICS

    A 7 kg purse is dropped from the top of the Leaning Tower of Pisa and falls 53 m before reaching the ground with a speed of 17 m/s. What was the average force of air resistance? F =
  96. Physics

    What is the potential difference required to accelerate a deuteron of mass 3.3x10^27kg and charges 1.6x10^-19C from rest to a speed of 5.0x10^6m/s?
  97. College Physics I

    A helicopter traveling upward at 120 m/s drops a package from a height of 500 meters. To the nearest second how long does it take to hit the ground?
  98. physics

    You drop a rock into a deep well and 4.1s later hear the splash. How far down is the water? Neglect the travel time of the sound. Express your answer using two significant figures.
  99. physics

    A solid disk of radius 0.20 m and a mass of 1.0 kg starts at rest and then speeds up to 100 rad/s in 10s. What is the torque that produces this rotational acceleration?
  100. physics

    A 224 g particle is released from rest at point A along the diameter on the inside of a fric- tionless, hemispherical bowl of radius 44 cm. The acceleration of gravity is 9.8 m/s2 .