joy

Newest questions posted by joy
  1. science

    examples of biological science
  2. Chemistry

    What volume of distilled water should be added to 400cm3 of 2.0mol/dm 3 H2SO4 to obtain 0.20mol/dm3 of solution
  3. life orientation

    identify and explain in five inhumane farming practices
  4. history

    Hi, I have a history essay coming up with the question: Explain Cause and Effect relationship between WW2, Cold War, and Civil Rights. I was wondering if anyone had any recommendations for things to make sure to include in the essay or links that will help
  5. Chemistry

    A 10 ml of 98% sulfuric acid was diluted to 200 ml water. What volume of water will be added to 5 ml of 40% sodium hydroxide to netralize the diluted sulphuric acid?
  6. physics

    1)The resultant wave from the interference of two identical waves traveling in opposite directions is described by the wave function y(x, t) = (2.49 m)sin(0.0458x)cos(5.40t), where x and y are in meters and t is in seconds. a) What is the frequency of the
  7. physics

    As in the figure below, a simple harmonic oscillator is attached to a rope of linear mass density 5.4 ✕ 10−2 kg/m, creating a standing transverse wave. There is a 4kg block hanging from the other end of the rope over a pulley. The oscillator has an
  8. physics

    The wave function (x,t)=(0.03m)sin(2.2x-3.5t) is for a harmonic wave on a string. (a) In what direction does this wave travel and what is its speed? (b) Find the wavelength, frequency, and period of this wave. (c) What is the maximum displacement of any
  9. physics

    A harmonic wave with a frequency of 90 Hz and an amplitude of 0.025 m travels along a string to the right with a speed of 20 m/s. a)Write a suitable sine wave function for this wave in terms of x and t. b) Find the maximum speed of a point on the string.
  10. physics

    A physical pendulum in the form of a thin rod of length 1.04 m is pivoted at point P, a distance x from the pendulum's center of mass. Find the value of x for which the period of the pendulum will be a minimum.
  11. physics

    A simple harmonic oscillator's velocity is given by vy(t) = (0.86 m/s)sin(11t − 5.55). Find the oscillator's position, velocity, and acceleration at each of the following times. (Include the sign of the value in your answer) a) t = 0s b) t = 0.5s c) t =
  12. physics

    What is the moment of inertia for a solid cylinder?
  13. physics

    A uniform horizontal beam with a length of 8m and a weight of 200N is attached to a wall by a pin connection. Its far end is supported by a cable that makes an angle of 53° with the beam (Figure below). If a 600N person stands 2m from the wall, find the
  14. physics

    A uniform ladder of length L rests against a smooth, vertical wall as shown in the figure below. If the mass of the ladder is m and the coefficient of static friction between the ladder and the ground is muks=0.4, find the minimum angle theta at which the
  15. physics

    3)A baseball player holds a 36oz bat (weight = 10N) with one hand at the point O (Figure below). The bat is in equilibrium. The weight of the bat acts along a line 60cm (or 0.6m) to the right of O. Determine the force and torque exerted on the bat by the
  16. physics

    An electric motor exerts a constant torque of 10N⋅m to the shaft of a grindstone with mass 16kg and radius 0.5m. If the system starts from rest, find (a) the rotational kinetic energy of the grindstone after 8s, (b) the work done by the motor during this
  17. physics

    The uniform block of width W and height H in the figure below rests on an inclined plane in static equilibrium. The plane is slowly raised until the block begins to tip over. Assume the tipping occurs before the block starts to slide. Find an expression
  18. physics

    How do I calculate String mass density from what I got frequency= 30.0Hz, segment length= 42.5cm , nodes=2, string length=83.5cm and tension=2.150kN?
  19. physics

    How do I calculate density of a string with what I have? The string mass is 12g and length is305.4cm
  20. Algebra

    Find ​(f◦​g)(x) and ​(g◦​f)(x). f(x)=4x(squared)+3​; ​g(x)=4x−2(f◦​g)(x)=______(Simplify your​ answer.) I keep getting lost on these f(x) and g(x)problems
  21. Algebra

    A company has determined that when x hundred dulcimers are​ built, the average cost per dulcimer can be estimated by ​C(x)=0.2x(squared)−2.6x+9.950​, where​ C(x) is in hundreds of dollars. What is the minimum average cost per dulcimer and how
  22. physics

    A solid cylinder of mass m and radius R rolls down a parabolic path PQR from height without slipping (assume R ≪ H) as shown in the figure below. Path PQ is rough (and so the cylinder will roll on that path), whereas path QR is smooth, or frictionless
  23. physics

    At one point during its swing, a wrecking ball exerts a tension force of FT = 9825 N on its cable, which makes an angle of α = 25.0° with the horizontal. The crane's 9.00-m-long boom is at an angle of θ = 60.0° with the horizontal. What is the torque
  24. physics

    A wheel starts from rest and in 10.65 s is rotating with an angular speed of 5.810 π rad/s. (a) Find the magnitude of the constant angular acceleration of the wheel. rad/s^2 (b) Through what angle does the wheel move in 6.085 s? rad
  25. physics

    A water molecule, consisting of two hydrogen atoms and one oxygen atom, resides in the plane of an x-y coordinate system. The coordinates of the oxygen atom and the two hydrogen atoms are, respectively, (0 m, 4.22 ✕ 10^−11 m), (7.57 ✕ 10^−11 m,
  26. physics

    A ballistic pendulum is used to measure the speed of bullets. It comprises a heavy block of wood of mass M suspended by two long cords. A bullet of mass m is fired into the block in the horizontal direction. The block, with the bullet embedded in it,
  27. physics

    A helicopter rescues a trapped person of mass m = 67.0 kg from a flooded river by lifting the person vertically upward using a winch and rope. The person is pulled 13.0 m into the helicopter with a constant force that is 11% greater than the person's
  28. physics

    Please help. If you need the figure, let know how I can show you and I will do it. A particle moves in the xy plane (see the figure below) from the origin to a point having coordinates x = 7.00 m and y = 4.00 m under the influence of a force given by F =
  29. physics

    A 1.80-g hailstone, which can be modeled as a particle, falls a vertical distance of 155 m at constant speed. What is the work done on the hailstone by gravity and air resistance? (a) gravity J (b) air resistance J
  30. physics

    A constant force of magnitude 5.75 N is exerted on an object. The force's direction is 57.5° counterclockwise from the positive x axis in the xy plane, and the object's displacement is Δr = (4.8i − 2.2j + 1.7k) m. Calculate the work done by this force.
  31. physics

    A newly established colony on the Moon launches a capsule vertically with an initial speed of 1.453 km/s. Ignoring the rotation of the Moon, what is the maximum height reached by the capsule? km The answer key is 1040km. I have tried v^2/2g
  32. physics

    A newly established colony on the Moon launches a capsule vertically with an initial speed of 1.453 km/s. Ignoring the rotation of the Moon, what is the maximum height reached by the cap
  33. physics

    In each situation shown in the figure below, a ball moves from point A to point B. Use the following data to find the change in the gravitational potential energy in each case. You can assume that the radius of the ball is negligible. (a) h = 1.45 m, θ =
  34. physics

    A 0.410-kg soccer ball is kicked at an initial speed of 32.5 m/s at an angle of 33.0° to the horizontal. What is the kinetic energy of the soccer ball when it has reached the apex of its trajectory?
  35. physics

    If α = 40°, β = 60°, and M = 4.0 kg, determine the tension in string 1 & 2. -------/ / 1 /2 / . . . Blockmass Alpha is on the top left angle and Beta is on the top right angle.
  36. physics

    The period of oscillation of a near-Earth satellite (neglecting atmospheric effects) is 84.3 min. What is the period of a near-Moon satellite? (R⊕= 6.37 × 10^6 m; RMoon= 1.74 × 10^6 m; m⊕ = 5.98 × 10^24 kg; mMoon = 7.36 × 10^22 kg.)
  37. physics/math

    can somebody explain how 5.06(g-a)-4.24(g+a) become 0.82 g - 9.3 a I'm confused
  38. physic

    Find the acceleration of the block of mass M = 5.06 kg in the figure below. (Take m = 4.24 kg.)
  39. Physics

    The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle
  40. physic

    The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle
  41. physic

    A 2.26 kg object is subjected to three forces that give it an acceleration a= −(8m/s^2)i + (6m/s^2)j. If two of the three forces are F1 = (36.2 N)i + (18N)j and F2 = −(12N)i + (8N)j,find the third force.
  42. physic

    Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)
  43. physics

    Find the acceleration of the two blocks sliding down the incline in the figure below. (Take m1 = 1.1 kg and m2 = 1.8 kg. Indicate the direction with the sign of your answer Link to figure, copy and paste part by part Part1: //d2vlcm61l7u1fs.cloudfront.
  44. physics

    Given that Earth orbits the Sun with a semimajor axis of 1.000 AU and an approximate orbital period of 365.24 days, determine the mass of the Sun. (1 AU = 1.496 ✕ 1011 m)
  45. physics

    In the figure below, 5.2 kg block A and 6.2 kg block B are connected by a string of negligible mass. Force A = (16 N) acts on block A; force B = (27 N) acts on block B. What is the tension in the string? (Express your answer in vector form.) To see the
  46. physics

    Somebody please shows me step by step to the answer key for part b. I got stuck at it for days The answer key is .126yr but my answer is .687yr. It looks easy but it is not. This what I have done-->I plug in the values that I find on google into the
  47. physics

    A race car travels 40 m/s around a banked (45° with the horizontal) circular (radius = 0.20 km) track. What is the magnitude of the resultant force on the 80-kg driver of this car?
  48. AP-B Physics

    a bug on a turntable which is rotating at 2.00 radians over second sits there for 1.7 seconds before he is brushed away. What was the angular distance the bug traveled.
  49. physic

    The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.
  50. physic

    Can somebody shows me step by step with numbers on how to calculate the period for this question-equation. A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a
  51. physics

    Find the acceleration of the two blocks sliding down the incline in the figure below. (Take m1 = 1.1 kg and m2 = 1.8 kg. Indicate the direction with the sign of your answer
  52. physic

    Somebody please show me how to get to the answer key for this question.I have been stuck at this question for days. Two black holes (the remains of exploded stars), separated by a distance of 10.0 AU(1 AU = 1.50 ✕ 10^11 m), attract one another with a
  53. physics

    Two banked curves have the same radius. Curve A is banked at an angle of 12°, and curve B is banked at an angle of 20°. A car can travel around curve A without relying on friction at a speed of 19.5 m/s. At what speed can this car travel around curve B
  54. physics

    A skydiver of mass 81.5 kg (including outfit and equipment) floats downward suspended from her parachute, having reached terminal speed. The drag coefficient is 0.533, and the area of her parachute is 20.96 m^2 . The density of air is 1.14 kg/m^3 . What is
  55. physics

    A mass m1 = 28 kg on a frictionless ramp is attached to a light string. The string passes over a frictionless pulley and is attached to a hanging mass m2. The ramp is at an angle of θ = 31° above the horizontal. m1 moves up the ramp uniformly (at
  56. physic

    Two black holes (the remains of exploded stars), separated by a distance of 10.0 AU (1 AU = 1.50 ✕ 10^11 m), attract one another with a gravitational force of 6.50 ✕ 10^25 N. The combined mass of the two black holes is 5.40 ✕ 10^30 kg. What is the
  57. physic

    Two spheres of mass M1 = 810 kg and M2 = 390 kg are placed 4.80 m apart. A particle of mass m = 12.0 kg is now placed midway between the two spheres. (a) What is the net gravitational force on the particle due to the two spheres? N toward the sphere of M1
  58. physics

    Can somebody shows me how to get to the answer key? The answer for a) is 1.5, b) rP is 1.34AU and rA is 2.01AU and c) is .335AU Copy and past this link part by part as it is to see the figure: part1: webassign. part2: net part3: /katzpse1/7-p-009.gif
  59. physics

    The figure below is a scaled representation of a planet's orbit with a semimajor axis of 1.528 AU. (Use the exact values you enter in previous answer(s) to make later calculation(s).) (a) Find the ratio of the aphelion-to-perihelion distance. rA rP = (b)
  60. physic

    I don't understand this question at all. If you want to see the figure, let me know The figure below is a scaled representation of a planet's orbit with a semimajor axis of 1.528 AU. (Use the exact values you enter in previous answer(s) to make later
  61. physic

    Does anybody know how I can find the mass of the electron for this question. I need to find it first to solve for the real one but don't see mass anywhere in the question.I see radiant and speed but no mass The radius of circular electron orbits in the
  62. physics

    A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a mass several times the mass of the Sun. Imagine a black hole whose mass is eighty-two times the mass of the
  63. physics

    Consider the Earth and the Moon as a two-particle system. (a) Find the gravitational field of this two-particle system at the point that is exactly halfway between the Earth and the Moon. (Assume a radial direction r̂ from the Earth to the Moon. Express
  64. physics

    The radius of circular electron orbits in the Bohr model of the hydrogen atom are given by (5.29 ✕ 10^−11 m)n^2, where n is the electron's energy level (see figure below). The speed of the electron in each energy level is (c/137n), where c = 3 ✕ 10^8
  65. physics

    A box of mass m rests on a rough, horizontal surface with a coefficient of static friction μs. If a force Fp arrow is applied to the box at an angle θ as shown, what is the minimum value of θ for which the box will not move regardless of the magnitude
  66. physics

    A small sphere of mass m = 0.520 kg is dropped from rest into a viscous liquid in which the resistive force on the sphere can be expressed as FD = −bv, and reaches one-fourth of its terminal speed in 3.14 s. (a) What is the terminal speed of the sphere?
  67. for steve

    Steve how does √((1.342t^2)^2 + (6.040t)^2) = 12.0 t = 1.839 I don't get it can you explain further? I took the square root of (1.342t^2)^2+(6.040t)^2 and it gives me 6.19
  68. physics

    can somebody shows me how to get to the answer key step by step. the answer key is 2.78i-10.2j A 1.49-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (4.00ti − 9.00j) N with t
  69. physics

    A sled and rider have a total mass of 58.4 kg. They are on a snowy hill accelerating at 0.4g. The coefficient of kinetic friction between the sled and the snow is 0.17. What is the angle of the hill's slope measured upward from the horizontal? You may find
  70. physics

    A sled and rider have a total mass of 58.4 kg. They are on a snowy hill accelerating at 0.4g. The coefficient of kinetic friction between the sled and the snow is 0.17. What is the angle of the hill's slope measured upward from the horizontal? You may find
  71. physics

    Somebody please shows me how to solve for b) and c)step by step. I found a)=2.27s but stuck there. A 1.49-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (4.00ti − 8.00j) Nwith
  72. physics

    The radius of circular electron orbits in the Bohr model of the hydrogen atom are given by (5.29 ✕ 10−11 m)n2, where n is the electron's energy level (see figure below). The speed of the electron in each energy level is (c/137n), where c = 3 ✕ 108
  73. physics

    The radius of circular electron orbits in the Bohr model of the hydrogen atom are given by (5.29 ✕ 10−11 m)n2, where n is the electron's energy level (see figure below). The speed of the electron in each energy level is (c/137n), where c = 3 ✕ 108
  74. physics

    A box of mass m rests on a rough, horizontal surface with a coefficient of static friction μs. If a force F with arrowp is applied to the box at an angle θ as shown, what is the minimum value of θ for which the box will not move regardless of the
  75. physics I need serious help please

    A 1.49-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (4.00ti − 8.00j) N with t in seconds. (a) At what time t will the particle's speed be 14.0 m/s? s (b) How far from the
  76. physic

    A force of 75.0 N in the horizontal direction is required to set a 37.3-kg box, initially at rest on a flat surface, in motion. After the box begins to move, a horizontal force of 51.3 N is required to maintain a constant speed. (a) What is the coefficient
  77. physic

    A 1.57-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (7.00ti − 8.00j)N with t in seconds. (a) At what time t will the particle's speed be 19.0 m/s? s (b) How far from the
  78. physics

    Harry Potter decides to take Pottery 101 as an elective to satisfy his arts requirement at Hogwarts. He sets some clay (m = 4.00 kg) on the edge of a pottery wheel (r = 0.730 m), which is initially motionless. He then begins to rotate the wheel with a
  79. physics

    A sled and rider have a total mass of 57.2 kg. They are on a snowy hill accelerating at 0.5g. The coefficient of kinetic friction between the sled and the snow is 0.20. What is the angle of the hill's slope measured upward from the horizontal? You may find
  80. physics

    can somebody shows me how to get to the answer key-- a)=2.51s, b)=19.9m, and c)=11.8i-16.1j A 1.57-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (7.00ti − 8.00j)N with t in
  81. physics

    A 1.49-kg particle initially at rest and at the origin of an x-y coordinate system is subjected to a time-dependent force of F(t) = (4.00ti − 8.00j) N with t in seconds. (a) At what time t will the particle's speed be 14.0 m/s? s (b) How far from the
  82. physic

    A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge. The second block is also connected to a third block with mass m3 by a second rope that hangs over a second ideal
  83. physic

    A student takes the elevator up to the fourth floor to see her favorite physics instructor. She stands on the floor of the elevator, which is horizontal. Both the student and the elevator are solid objects, and they both accelerate upward at 5.15 m/s2.
  84. physic

    could somebody shows me how to get to the answer key. The answer key is 1290N.The x and y coordinates of a 4.30-kg particle moving in the xy plane under the influence of a net force F are given by x = t4 − 5t and y = 5t2 + 1, with x and y in meters and t
  85. for bobpursley

    where does 4.90s come from when t when t was given as 4.20s? forcex=t^4-5t=4.20^4-5(4.20)=290 forcey=7t^2+1=7*(4.90)^2 +1=169 force=sqrt(forcex^2+forcey^2)=336 N
  86. physic

    Three forces F1 = (80.90i − 54.63j) N, F2 = (23.50i − 80.52j) N, and F3 = (−104.4i + 361.9j) N are exerted on a particle. The particle's mass is 23.11 kg. Find the particle's acceleration. (Express your answer in vector form.) a = m/s2
  87. physic

    How do I find degree when there isn't any number on this question. please explain with step. A projectile is launched up and to the right over flat, level ground. Its range is equal to half of its maximum elevation above the ground. What was the angle
  88. physic

    can somebody show me how to find the time s step by step. A golfer hits his approach shot at an angle of θ = 46.3°, giving the ball an initial speed of v0 = 39.6 m/s (see figure below). The ball lands on the elevated green, yf = 4.1 m above the initial
  89. physic

    Two blocks are connected by a rope that passes over a massless and frictionless pulley as shown in the figure below. Given that m1 = 18.04 kg and m2 = 10.57 kg, determine the magnitudes of the tension in the rope and the blocks' acceleration. T = N a =
  90. physic

    The x and y coordinates of a 3.70-kg particle moving in the xy plane under the influence of a net force F are given by x = t4 − 5t and y = 7t2 + 1, with x and y in meters and t in seconds. What is the magnitude of the force F at t = 4.20 s? N
  91. physic

    Can somebody shows me how to calculate for part c. the answer key is 1.365h. A jetliner travels with a constant speed of 573.7 km/h relative to the air to a city 780.1 km due south. (a) What is the time interval required to complete the trip if the
  92. 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
  93. physic

    Three forces act on an object with F1 = (6.03i + 11.17j) N and F2 = (2.19i − 13.53j) N. If the net force on the object is zero, what is the unknown force, F3? (Express your answer in vector form.) F3 = N
  94. Math

    would I set up this problem and work it this way? (x5) ^8 =16
  95. physic

    A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 22 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.
  96. physic

    A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 22 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.
  97. physic

    A projectile is launched up and to the right over flat, level ground. Its range is equal to half of its maximum elevation above the ground. What was the angle between its initial velocity and the ground? Ignore air resistance. ° above the horizonontal
  98. physic

    A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately. (a) How much
  99. physic

    A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately.
  100. physic

    Two bicyclists in a sprint race begin from rest and accelerate away from the origin of an xy coordinate system. Miguel's acceleration is given by (−0.800i + 1.20j) m/s2, and Lance's acceleration is given by (1.40i + 0.400j) m/s2. (a) What is Miguel's

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