# A block weighing 70.7 N rests on a plane inclined at 21.6° to the horizontal. The coefficient of the static and kinetic frictions are 0.23 and 0.12 respectively. What is the minimum magnitude of the force F, parallel to the

22,562 questions, page 96
1. ## physics

a plane is flying at 250 km hr an hit a 50 km hr headwind what is its resultantt speed relative to the ground

asked by Victor on December 11, 2011
2. ## Maths.literacy

If a plane flies at 185km/h, how long would it take to fly from Morgenhof to Neethlingshof? Show calculations.

asked by Calvin on July 24, 2014
3. ## math

What is the area of the region in the xy-plane bounded by the graphs of x=1995, x=1996, y=1997, and y=1998?

asked by roman on July 12, 2015

Find the equation of the plane that passes through the point (3,7,-1) and is perpendicular to the line of intersection of the planes x-y-2z+3=0 and 3x-2y+z+5=0

asked by Amber on June 10, 2013
5. ## PreCal

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.

asked by Jack on September 5, 2011
6. ## algebra

Find the radius and the center of the circular section of the sphere |r| = 17 cut off by the plane rÂ·(i+2j+2k) = 24. Solution

asked by shamma on October 4, 2017
7. ## math

can you please help. If a plane travels 550 kilometers per hour, represent the distance it will travel in h hours. thank you

asked by kiki on September 14, 2012
8. ## MATH

Find an equation of the tangent plane to the given parametric surface at the specified point. r(u, v) = u cos vi + u sin vj + vk; u = 7, v = π/3

asked by Taylor on November 16, 2016
9. ## calculus

Prove (by using a point and a normal vector) that the plane whose intercepts with the coordinate axes are x=1, y=1, and z=1 is given by the equation x+y+z=1

asked by Alex on October 4, 2012
10. ## math

find the general form of the equation of the plane passing through the point and perpendicular to the specified vector. (8, 6, 3) n =i-6j + k a. x - 6y + z - 25 = 0 b. x - 6y + z + 25 = 0 c. x - 6y + z = 0 d. 8x + 6y + 3z - 25 = 0 e. 8x + 6y + 3z + 25 = 0

asked by Sreya on August 31, 2016
11. ## Maths

Three circles are placed on a plane in such a way that each circle just touches the other two , each having a radius of 10 cm.find the area of region enclosed by them

asked by Anonymous on February 17, 2013

A plane is traveling toward the southwest at 200 km/h. Calculate the westward and southward components of the velocity.

asked by John on September 23, 2015
13. ## Math

An airplane flying an altitude of 34,000 ft descends at a rate of 25 ft per second. What is the height of the plane after 3 minutes?

asked by TJ on November 11, 2015
14. ## Math - Geometry

Suppose point P and lines l and m all lie on the same plane. If the distance from P to l and from P to m is 3, which of the following could be true? A)l is parallel to m B)l is perpendicular to m C)l=m D)any of these

asked by Thamara on December 23, 2009
15. ## science

A plane is flying at an angle of 20 N of east 230 m/s. what is the component of its velocity in the northward direction?

asked by pali on March 27, 2012
16. ## vector calculus

Hi, I'm having trouble answering this question. The lines l1 and l2 are defined as l1: (x-1)/3 = (y-5)/2 = (z-12)/-2 l2: (x-1)/8 = (y-5)/11 = (z-12)/6 The plane j contains both l1 and l2. Find the Cartesian equation of j.

asked by greg on April 18, 2017
17. ## Physics

An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?

asked by Sandra on April 16, 2014
18. ## math

asked by makeeda on January 17, 2010
19. ## Physics

For this problem, you are allowed to consult with other members of the class, but not with faculty and not with anyone outside the course. Simplify all your expressions. A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0.

asked by David on April 6, 2013
20. ## physics

A science student is riding on a flatcar of a train traveling along a strait, horizontal track at a consistent speed of 12 m/s. The student throws a ball into the air along a path he judges to make an initial angle of 65 degrees with the horizontal and to

asked by Cali on June 1, 2018
21. ## Physics

A missile is shot straight up into the air. At the peak of its trajectory, it breaks up into three pieces of equal mass, all of which move horizontally away from the point of the explosion. one piece travels in a horizontal direction of 28degrees east of

asked by Anonymous on October 13, 2011
22. ## Physics

A science student is riding on a flatcar of a train travelling along a straight horizontal track at a constant speed of 10.0 m/s.The student throws a ball into the air along a path that he judges to make an initial angle of 60.0 degrees with the horizontal

asked by Sammie on February 17, 2013
23. ## Physics

A baseball pitcher delivers a fastball that crosses the plate with an angle of 7.89 degrees relative to the horizontal and a speed of 87.5 mph. The ball (mass 0.145 kg) is hit back over the head of the pitcher at an angle of 38.03 degrees with respect to

asked by Kathy on March 1, 2015
24. ## Physics

A hemisphere of radius r is placed on a horizontal plane and a small mass of "m" is placed on the top of the hemisphere. Find the height from the ground to the mass m,at the moment it loses it's contact with the hemisphere.And the contact is frictionless.

asked by Shenaya on July 11, 2017
25. ## Physics

A baseball whose mass is 0.25kg is struck by a bat. just before impact, the ball is traveling horizontally ay 40m/s to the left and it leaves the bat at an angle of 30 degrees above the horizontal with a speed of 60m/s. if the ball and bat were in contact

asked by Rita on November 26, 2012
26. ## Physics

A uniform horizontal rod of mass 2.2 kg and length 0.63 m is free to pivot about one end as shown. The moment of inertia of the rod about an axis perpendicular to the rod and through the center of mass is given by I = ￼￼￼ml2/12 If an 8.5N force at an

asked by A on December 6, 2011
27. ## calculus

A 25-ft ladder rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 0.18 ft/sec, how fast, in ft/sec, is the top of the ladder sliding down the wall, at the instant when the bottom of the ladder is 20 ft from

asked by Anonymous on December 16, 2014
28. ## physics

A 2.20kg mass is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 21.3N is required to hold the mass at rest when it is pulled 0.190m from its equilibrium position (the origin of the x axis). The mass is now released

asked by nicole on November 14, 2013
29. ## Physc

A symmetric projectile spends a total of 20 seconds in the air. It reaches a peak height of 8 meters. HOw long it takes to reach its peak height? The projectile has a range of 80 meters.What is its horizontal velocity? What is the projectile's horizontal

asked by Mary on March 4, 2014
30. ## Physics

A ball with a mass of 5.8 kg is moving to the right at 10.3 m/s and collides with a stationary ball of mass 10.9 kg. After the collision, the 5.8 kg ball moves to the right, but at an angle of 20° below the horizontal, at a speed of 4.3 m/s. Find the

asked by Shawn on December 20, 2012
31. ## Physics

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. The Figure shows a cross section of Mt. Fuji, in Japan. (a) At what initial speed would a bomb have to be ejected, at angle q0 =

asked by Sam on January 2, 2016
32. ## physic

Please help how much heat is needed to transform a 2.5 kg block of ice at -4°c to a puddle of water at 12°c? Cwater=4200J kg^-1 °C^-1, Cice=2100J kg^-1 °C^-1, Lf=3.33*10^5 J kg^-1.

asked by wai on December 27, 2014
33. ## physics

A 16 kg block slides down a frictionless slope which is at angle θ = 20◦. Starting from rest,the time to slide down is t = 1.88 s.The acceleration of gravity is 9.8 m/s2.

asked by Anonymous on October 26, 2011
34. ## science

A cubic block of one of the substances listed on the chart has a side length of 5.0 cm and a mass of 224 grams. Which material is it?

asked by Luna on October 19, 2018
35. ## college physics

a block of ice initially sliding at 15m/s on a frozenpond comes to rest after traveling 90 meters. What is the coefficient friction?

asked by sarah on September 25, 2010
36. ## Physics

A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?

asked by Em on April 5, 2016
37. ## physics

If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove?

asked by anna on September 12, 2012
38. ## PHYSICS

from a height of 1.5m a 2.0kg block slides down an incline which is 2.5m long and out onto the level floor. how far does it slide horizontally? muse of k is 0.32

asked by EMMA on July 11, 2014
39. ## Science

how do you calculate if a block of wood dropped form a tall building has attained a velocity of of 78.4 m/s, how long has it been falling?

asked by Layla on October 5, 2008
40. ## Physics

A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?

asked by Derrick on February 10, 2011
41. ## Educational perspective

Which of the following play centers teaches the children to follow directions? A. Listening B. Dramatic C. Library D. Block answer a.

asked by Priscila on April 22, 2018
42. ## English

What type of literary device? " At that instant he took a pistol out of his pocket and held the ice cold block at my head"

asked by Rob on March 4, 2016
43. ## English

Typed or printed letters should always contain _____. a formal salutation a handwritten signature contractions block paragraphs

asked by casey on September 30, 2014
44. ## math

An object weighing 5 pounds on Earth will weigh 2 pounds on Mercury. The Brooklyn Bridge weighs 14,695 tons on Earth. What would it weigh on Mercury (in tons) ?

asked by Shiv on March 17, 2018
45. ## Physics

A 90N dog climbs up a non-uniform (lambda = Cx^(3/2)), 100N ladder. The top of the ladder rests on the top of a frictionless fence that is 3m high and forms a 30 degree angle with the ground, which is rough and has a coefficient of friction of 0.60. How

asked by Min on November 27, 2012
46. ## math

a ladder rests against the top of a wall. The head of a person 3.5 feet tall just touches the ladder. The person is 3 feet from the wall and 7 feet from the foot of the ladder. What is the height of the wall?

asked by Alexis on May 9, 2011
47. ## Calc 3

The actual span of the base of the dome is 143 feet. 1) Use cylindrical coordinates to write the surface of the dome as a function of the distance from the center of the base; that is find z = f (r) . 2) Use your function to find the height of the dome;

asked by joe on December 7, 2009
48. ## Chemistry

4.72 g of a compound of carbon, hydrogen, and silver was burned in an atmosphere of oxygen, yielding 7.95 g of CO2, 1.02 g of H2O and 3.02 g of a mixture of silver and silver oxide. Because the production of this mixture yielded an indeterminate value for

asked by CL on February 23, 2017
49. ## Chem 151

A CaCO3 mixture weighing 2.75 grams was treated with 9.75 mL of 3.00 M HCl to liberate CO2. After the CO2 was liberated, the mass of the mixture decreased to 2.621 grams. Determine the mass of CaCO3 present in the mixture.

asked by Double checking ans on March 21, 2013
50. ## chemistry

1. 30.0 ml of ethyl alcohol(density=0.790g/ml)are added to a graduated cylinder that weighs 44.28 grams. what will be the mass of the graduated cylinder plus the alcohol(in grams)? 2. what is the volume (in ml)of a liquid(density=2.07 g/ml)weighing

asked by ann on September 22, 2011
51. ## precalculus

How do I find the vertical/horizontal compression/stretch? For the graph, determine the equation of the function in the form y=a(x-h)^2+k. Then describe the transformations that were applied to y=x^2 to obtain the graph. Here is the graph: imgur dot

asked by Melinda on December 10, 2011
52. ## Physics

A plank, of length L = 3.7 m and mass M = 19.6 kg, rests on the ground and on a frictionless roller at the top of a wall of height h = 1.70 m (see Figure). The center of gravity of the plank is at its center. The plank remains in equilibrium for any value

asked by Anonymous on September 17, 2018
53. ## Chemistry

Hydrogen peroxide, H2O2, solution can be purchased in drug stores and used as an antiseptic. A sample of such a solution weighing 1.00 grams was acidified with sulfuric acid and titrated with .02000 M solution of KMnO4. The unbalanced reaction is H2O2(aq)

asked by HELP!!! on April 15, 2010
54. ## college physics

A fisherman poles a boat as he searches for his next catch. He pushes parallel to the length of the light pole, exerting a force of 245 on the bottom of a shallow lake. The pole lies in the vertical plane containing the boat's keel. At one moment, the pole

asked by molly on March 2, 2015
55. ## fizk

3 - A box of mass 2 Kg lies on a rough horizontal floor with the coefficient of friction between the floor and the box being 0.5 (Figure 3). A light string is attached to the box in order to pull the box across the floor. If the tension in the string is

asked by Anonymous on April 30, 2014
56. ## physics

Q. A 200 kg load is suspended by a cable from a crane . Two ropes are attached to the load , acting at 90 deg to each other. One rope exerts a pull of 220 N , at 10 deg below horizontal, the other rope exerts a force of 360 N at 15 deg below horizontal.

asked by john on February 7, 2014
57. ## caculus

A 10-ft ladder rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 1 ft/sec, how fast, in ft/sec, is the top of the ladder sliding down the wall, at the instant when the bottom of the ladder is 6 ft from the

asked by Anonymous on December 17, 2014
58. ## physics

An owl is carrying a mouse to the chicks in its nest. Its position at that time is 4.00 m west and 12.0 m above the center of the 30.0 cm diameter nest. The owl is flying east at 3.50 m/s at an angle 30.0º below the horizontal when it accidentally drops

asked by kaval on January 29, 2015
59. ## statistics

AB ia a uniform rod of length 120 cm and weight 18kg.wt it rotates about a hinge at its end A. its end B is pulled by a light string whose other end is tied to point C over A. the rod is in equilibrium when it inclines to the horizontal at 30degree if the

asked by Anonymous on September 29, 2011
60. ## college physics

A 0.580-kg bucket rests on a scale. Into this bucket you pour sand at the constant rate of 85.0 g/s. A)If the sand lands in the bucket with a speed of 4.30 m/s, what is the reading of the scale when there is 0.770 kg of sand in the bucket? B)What is the

asked by Kyle on March 18, 2010
61. ## physics

A horizontal spring with spring constant 73.2 N/m is compressed 16.7 cm and used to launch a 2.42 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of kinetic friction of the

asked by amy on October 31, 2009
62. ## Physics

You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if

asked by Marcus on March 21, 2014
63. ## Physics

An object of mass 1.25 kg on a flat surface has two forces acting on it, F1 and F2 in the horizantal direction. F1 acts in the positive direction, F2 acts in the negative direction. The magnitude of F1 is 26.75 N. The object moves strictly along the

asked by Lisa on October 26, 2010
64. ## physics

trying to raise a barrel using sections of pipe.The three objects are horizontal cylinders resting on level ground. The barrel has a mass of 100 kg and its diameter is 2.0m. Each pipe has a diameter of 0.50 m. What minimum horizontal force must his feet

asked by John on October 19, 2011
65. ## physics

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 16.0 m/s. The cliff is h = 25.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the

asked by joanna on February 4, 2016
66. ## pysics

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 16.0 m/s. The cliff is h = 25.0 m above a flat horizontal beach, as shown in the figure below. How long after being released does the stone strike the

asked by lisa on February 5, 2016
67. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 745 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.020 m below the center. What is the horizontal distance between the

asked by Anonymous on October 20, 2010
68. ## Science

Physics A scientific instrument weighing 98 pounds on the Earth is transported to another planet whose mass is 1.7 Earth masses and whose radius is 0.7 Earth radii. What does this instrument weigh on this planet? To be graded correctly, enter the new

asked by Erika on February 6, 2017
69. ## physics

I have a question based off of the response to the question I posted below. A dragster and driver together have mass 918.8 kg. The dragster,starting from rest,attains a speed of 25.8 m/s in .53s . Find the average acceleration of the dragsters during this

asked by alexa on July 4, 2011
70. ## math

ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements. A missile is fired from a jet flying horizontally at Mach 2 (2200 ft/s). The missile has a horizontal acceleration of 1000 ft/s2. Calculate its

71. ## Physics - check this work for horizontal displacem

A 1.5kg melon is placed on top of the post. A girl lying on the ground fires a 500g arrow at ground level with velocity of 20m/s, 60deg above the horizontal, and hits the melon when the arrow is at its highest point. The melon, with the arrow embedded,

asked by Farah on December 5, 2010
72. ## Physics

A dart gun is fired while being held horizontally at a height of 0.90 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 4.00 m. A college student holds the same gun in a horizontal

73. ## Physics

A small steel ball bearing with a mass of 24 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.23 m. Calculate the horizontal distance the ball will travel if the same spring is

asked by Lindsay on November 4, 2007
74. ## physics

A dart gun is fired while being held horizontally at a height of 0.90 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 4.00 m. A college student holds the same gun in a horizontal

75. ## physics

A dart gun is fired while being held horizontally at a height of 1.00 m above ground level and while it is at rest relative to the ground. The dart from the gun travels a horizontal distance of 5.00 m. A college student holds the same gun in a horizontal

asked by ben on October 3, 2010
76. ## Physics

A freight car with a mass of 29,000 kg rolls down an inclined track through a vertical distance of 2.8 m. At the bottom of the incline, on a level track, the car collides and couples with an identical freight car that was at rest. What percentage of the

asked by Yuki on November 16, 2011
77. ## HELP!

How many times do I have to tell you the answer is d. Goodness. http://www.jiskha.com/display.cgi?id=1168934037 all you had to do was add two numbers given, and double it, and put the neg sign in front. I have no idea what the answer to this problem is,

asked by bobpursley on January 16, 2007
78. ## Phyics

two blocks are moving down a ramp that is inclined at 30.0. Box 1(of mass 1.55kg) is above box 2(of 3.1kg) and they are connected by a massless rod. Find the tension of the rod if the coefficient of kinetic friction for box 1 is .226 and box 2 is .113 my

asked by Jess on November 26, 2015
79. ## physics

A circular loop of area 0.8 m2 is inclined at an angle 60° in a uniform magnetic field of 0.4 Tesla. What is the magnetic flux associated with the loop? Choose one answer. a. 0.32 Weber b. 0.16 Weber c. 0.28 Weber d. 0.14 Weber

80. ## PHYSICS

1)A picture of width 40 cm weighing 40N hangs from a nail by means of flexible wire attached to the sides of the picture frame. The midpoint of the wire passes over the nail which is 3 cm higher than the points where the wire is attached to the frame. Find

asked by Ann on November 29, 2010
81. ## Math

A ladder 20 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does

asked by Jennifer on April 28, 2010
82. ## math

A ladder 14 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does

asked by peter on May 3, 2010
83. ## calculus

A ladder 14 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does

asked by peter on May 3, 2010
84. ## Math

A ladder 20 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does

asked by Jennifer on April 28, 2010

A ladder 20 ft long rests against a vertical wall. Let \theta be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does

asked by Jennifer on April 28, 2010
86. ## Math

Use each of the numbers 7, 8, 9, 10, and 11 once and only once to fill in the circles so that the sum of the numbers in the three horizontal circles equals the sum of the numbers in the three vertical circles. OOO O 0 Of the three possible solutions, which

asked by Kelly on October 19, 2009
87. ## Physics

A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.63 V and a current of 2.7 A are induced in the coil. The wire is then re-formed into a single-turn square coil, which

asked by M on May 14, 2012
88. ## English

Posted by rfvv on Monday, September 1, 2014 at 8:28am. Q: What can you do for the school? 1. I can clean the floor of my classroom. 2. I can clean the floor of the hallway of my classroom. 3. I can clean the stairs with a mop. 4. I can pick up trash on the

asked by rfvv on September 2, 2014
89. ## physics

An air puck of mass 0.33 kg is tied to a string and allowed to revolve in a circle of radius 1.12 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 1.1 kg is tied to it. The

asked by tanya on December 10, 2011
90. ## physics

Two flat surfaces are exposed to a uniform, horizontal magnetic field of magnitude 0.50 T. When viewed edge-on, the first surface is tilted at an angle of 11° from the horizontal, and a net magnetic flux of 8.20 10-3 Wb passes through it. The same net

asked by Anonymous on February 9, 2012
91. ## physics

A golfer hits a ball from the origin with an initial speed of 30.0 m/s at an angle of 50 degrees above the horizontal. The ball lands on a green that is 5.00 m above the level where the ball was struck. (a) How long was the ball in the air? (b) How far has

asked by Joseph on October 26, 2018
92. ## physics

A golfer hits a ball from the origin with an initial speed of 30.0 m/s at an angle of 50 degrees above the horizontal. The ball lands on a green that is 5.00 m above the level where the ball was struck. (a) How long was the ball in the air? (b) How far has

asked by goober on November 1, 2018
93. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 660 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.027 m below the center. What is the horizontal distance between the end

asked by Hannah on October 4, 2015
94. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end

95. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 745 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.020 m below the center. What is the horizontal distance between the

asked by Katsu on October 19, 2010
96. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end

asked by Shelby on September 12, 2016
97. ## Physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 720 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.031 m below the center. What is the horizontal distance between the

asked by Winona on October 17, 2014
98. ## physics

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 795 m/s. The barrel is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.042 m below the center. What is the horizontal distance between the