joy

Newest questions and responses by joy
  1. Physics

    A particle starts from rest and moves with a constant acceleration of 0.5m/s2. Calculate the time taken by the particle to cover a distance of 25m.

    asked on October 30, 2018
  2. Art history

    What are some of the reasons it’s so difficult to pinpoint individual artists names in African art? Requires a brief answer consisting of A few sentences or a listing

    asked on October 22, 2018
  3. Art history

    Describe the great serpent mound and some things that were found there

    asked on October 22, 2018
  4. Arts

    Why did Egyptians built pyramids? Where are pyramid important to them? What was inside? How are they built?

    asked on October 18, 2018
  5. Art

    Give some examples of specific Greek temples and what material was used to make each. Explain what types of material changes were made in building Greek temples and what effect this has on the architectural world.

    asked on October 18, 2018
  6. Fine arts

    Describe some different features architects used in the colosseum that made it so unique.

    asked on October 18, 2018
  7. Fine arts

    Describe with the arch of Constantine wasn’t how it was used.

    asked on October 18, 2018
  8. Fine arts

    Why was it important to have the entire body of the pharaoh shown in a relief sculpture created for a tomb?

    asked on October 18, 2018
  9. science

    examples of biological science

    asked on August 24, 2018
  10. Chemistry

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

    asked on August 2, 2018
  11. life orientation

    identify and explain in five inhumane farming practices

    asked on August 1, 2018
  12. 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

    asked on May 13, 2018
  13. 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?

    asked on May 9, 2018
  14. 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

    asked on April 25, 2018
  15. 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

    asked on April 25, 2018
  16. 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

    asked on April 25, 2018
  17. 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.

    asked on April 25, 2018
  18. 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.

    asked on April 25, 2018
  19. 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 =

    asked on April 24, 2018
  20. physics

    What is the moment of inertia for a solid cylinder?

    asked on April 24, 2018
  21. 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

    asked on April 24, 2018
  22. 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

    asked on April 23, 2018
  23. 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

    asked on April 22, 2018
  24. 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

    asked on April 22, 2018
  25. 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

    asked on April 22, 2018
  26. 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?

    asked on April 21, 2018
  27. physics

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

    asked on April 20, 2018
  28. 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

    asked on April 15, 2018
  29. 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

    asked on April 15, 2018
  30. 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

    asked on April 15, 2018
  31. 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

    asked on April 12, 2018
  32. 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

    asked on April 11, 2018
  33. 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,

    asked on March 27, 2018
  34. 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,

    asked on March 27, 2018
  35. 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

    asked on March 15, 2018
  36. 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 =

    asked on March 13, 2018
  37. 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

    asked on March 11, 2018
  38. 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.

    asked on March 11, 2018
  39. 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

    asked on March 9, 2018
  40. 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

    asked on March 9, 2018
  41. 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 =

    asked on March 9, 2018
  42. 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?

    asked on March 9, 2018
  43. 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.

    asked on March 2, 2018
  44. 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.)

    asked on March 1, 2018
  45. physics/math

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

    asked on February 28, 2018
  46. physic

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

    asked on February 28, 2018
  47. 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

    asked on February 28, 2018
  48. 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

    asked on February 28, 2018
  49. 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.

    asked on February 27, 2018
  50. 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)

    asked on February 27, 2018
  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 Link to figure, copy and paste part by part Part1: //d2vlcm61l7u1fs.cloudfront.

    asked on February 27, 2018
  52. 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)

    asked on February 27, 2018
  53. 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

    asked on February 27, 2018
  54. 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

    asked on February 26, 2018
  55. 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?

    asked on February 26, 2018
  56. 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.

    asked on February 25, 2018
  57. 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.

    asked on February 24, 2018
  58. 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

    asked on February 23, 2018
  59. 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

    asked on February 23, 2018
  60. 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

    asked on February 23, 2018
  61. 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

    asked on February 23, 2018
  62. 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

    asked on February 22, 2018
  63. 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

    asked on February 22, 2018
  64. 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

    asked on February 22, 2018
  65. 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

    asked on February 21, 2018
  66. 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

    asked on February 20, 2018
  67. 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)

    asked on February 20, 2018
  68. 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

    asked on February 17, 2018
  69. 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

    asked on February 17, 2018
  70. 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

    asked on February 16, 2018
  71. 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

    asked on February 16, 2018
  72. 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

    asked on February 16, 2018
  73. 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

    asked on February 16, 2018
  74. 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?

    asked on February 15, 2018
  75. 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

    asked on February 14, 2018
  76. 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

    asked on February 14, 2018
  77. 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

    asked on February 13, 2018
  78. 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

    asked on February 12, 2018
  79. 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

    asked on February 11, 2018
  80. 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

    asked on February 9, 2018
  81. 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

    asked on February 9, 2018
  82. 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

    asked on February 9, 2018
  83. 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

    asked on February 9, 2018
  84. 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

    asked on February 9, 2018
  85. 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

    asked on February 8, 2018
  86. 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

    asked on February 8, 2018
  87. 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

    asked on February 8, 2018
  88. 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

    asked on February 8, 2018
  89. 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

    asked on February 7, 2018
  90. 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

    asked on February 7, 2018
  91. 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.

    asked on February 7, 2018
  92. 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

    asked on February 7, 2018
  93. 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

    asked on February 7, 2018
  94. 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

    asked on February 6, 2018
  95. 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

    asked on February 6, 2018
  96. 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

    asked on February 6, 2018
  97. 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 =

    asked on February 6, 2018
  98. 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

    asked on February 6, 2018
  99. 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

    asked on February 5, 2018
  100. 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 on February 5, 2018

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