# anonymus

Popular questions and responses by anonymus
1. ## Calculus

A 5,000 m² rectangular area of a field is to be enclosed by a fence, with a moveable inner fence built across the narrow part of the field, as shown.The perimeter fence costs \$10/m and the inner fence costs \$4/m. Determine the dimensions of the field to

2. ## physics

A student places her 500 g physics book on a frictionless table. She pushes the book against a spring, compressing the spring by 4.0 cm, then releases the book. What is the book’s speed as it slides away? The spring constant is 1250 N/m. 1

3. ## Calculus

Prove that it is an identity: cos (4x)=8cos^4(x)-8cos^2(x)+1

4. ## chemistry

The radioactive decay of carbon-14 is first-order and the half-life is 5800 years. While a plant or animal is living, it has a constant proportion of carbon-14 (relative to carbon-12) in its composition. When the organism dies, the proportion of carbon-14

5. ## Calculus

Why is the answer to the exact value of arctan(tan(3pi/4))= -pi/4

6. ## English

1. Salt Lake City, Utah's capital and largest city, was founded in 1847. 2. Janice and Carla spent the day at the mall. 3. Standard time was adopted in the United States in 1884. 4. The geographic center of the United States is in Kansas. 5. The first

7. ## Algebra

1. 10a – 8b (-) 4a + 5b 2. 5b + 3c (-) 4b + 3c 3. 6d + 6e (-) 9d – 8e 4. 8x – 3y (-) -4x + 8y 5. 6rs – 7bc (-) 9rs – 7bc 6. 5xy – 9cs (-)-3xy + cs 7. x2 – 6x + 5 (-) 3x2– 2x – 2 8. 3y2 – 2y – 1 (-) -5y2– 2y + 6 9. (7a + 6b – 9c)

8. ## Math

A pipe has an outside diameter of 1.25 inches and an inside diameter of 0.75 inches. If Kelly hacksaws the pipe in two, what fraction of the pipe cross sectional area is sawn when the blade breaks through to the inside?

9. ## Calculus

If cosx=3√/2 and −π/2≤x≤0, then the exact value of x, in radians

10. ## Social Studies

Which physical feature would have the GREATEST impact on Sub-Saharan Africa? A) Sahara Desert B) Kalahari Desert C) Atlas Mountains D) Mount Kilimanjaro

11. ## physics

4. A 1500 kg car starts from rest and drives around a flat 50 m diameter circular track. The forward force provided by the car’s wheels is a constant 1000 N. a. What are the magnitudes and direction of the car’s acceleration at t = 10 s? b. If the car

12. ## physics

On a winter day with the temperature hovering near freezing, the coefficent of static friction between the tires and an icy road is 0.27. What is the maximum incline that a four-wheel drive vehicle can climb with zero acceleration?

13. ## physics

A rocket engine uses fuel and oxidizer in a reaction that produces gas particles having a velocity of 1380 ms-1. The desired thrust is to be 195000 N. 1-What must be the fuel/oxidizer consumption rate (in kg s-1)? 2-f the initial weight of the rocket is

14. ## English

Part A Infinitives An infinitive is the base form of the verb, commonly preceded by to . An infinitive may be used as a noun, adverb, or adjective. Examples: -To know him is to like him. (noun) -She came here to study. (adverb) -That is the movie to see.

15. ## math

Find the equation of the line containing the point ( 1, -2 ) and perpendicular to the line containing the points ( 1, 5 ) and ( 3, 2 )

16. ## Math

A pitcher throws a 142 g baseball, which accelerates at a speed of 9 m/s^2. How much force does the pitcher apply to the ball?

17. ## math

The sales team at an electronics store sold 48 computers last month. The manager at the store wants to encourage the sales team to sell more computers and is going to give all the sales team members a bonus if the number of computers sold increases by 30%

18. ## math

You have a large container of olive oil. You have used 22 1/2 quarts of oil. Twenty-five percent of the olive oil remains. How many quarts of olive oil remain?

19. ## Physics

What is the difference in pressure of an object floating VS being pushed down in water VS being held by a string in water?

20. ## Calculus

How to find all solutions of the equation sec(theta)cos(theta)=1

21. ## physics

The Figure shows two blocks, block 1 and block 2, held in equilibrium by a massless, unstretchable string. The mass of block 1 is 14.2 kg, the mass of block 2 is 6.2 kg, and the angle theta is 26o The system begins to slip if any additional mass is added

22. ## physics

Two masses of 2.25 kg each, connected by a string, slide down a ramp making an angle of 34o with the horizontal. The coefficient of kinetic friction between M1 and the ramp is 0.33. The coefficient of kinetic friction between M2 and the ramp is 0.12. Find

23. ## physics

At the entrance channel of a harbor, the tidal current has a velocity of 4.22 km/hr in a direction 17.4o south of east. Suppose a ship caught in this current has a speed of 17.5 km/hr relative to the water. If the helmsman keeps the bow of the ship aimed

24. ## Art

based on their attire, playing music during leisure time is most likely a pursuit of which greek class citizen? lower class musical class upper class middle class i believe it is upper class

25. ## History

1830s-1840s A. Evaluate the presidency of Andrew Jackson. Do you think that his actions were considered normal during his time? B. Analyze racism towards Native Americans during this period. C. Identify and describe at least two (2) positive events during

26. ## Social Studies

Geographically, people in western Russia have tended to identify with Europe more than Asia because A) the soil is so similar. B) their languages are quite similar. C) the Mediterranean Sea connects them. D) the Ural Mountains seal them off from the rest

27. ## math

In a private school the ratio of boys to girls is 5:3 if there are 50 more boys than girls. How many students are there in total?

28. ## Math

Some number multiplied by -6 is 36. Multiply this number by 8. Divide the answer by 2. What is the final number?

29. ## math

Explain how you can be sure that all rates you have written on a double number line are correct.

30. ## math

-15 - (3-7) + 6 * (-2) + (-8) - 9

31. ## math

2(3)cubed - (-9 + 5)squared =?

32. ## math

What is the 40th digit in the pattern 0.142857?

33. ## Science

What energy change occurs during condensation?

34. ## math

Reward, one week only, receive a 10 dollar gift card for every 50 dollars spent. 1) If your reward is \$10, what do you know about the amount of your purchase? 2) Give three possible amounts if your reward is \$20. 3) What should you do if your total

35. ## science

Describe the context of your community in terms of its environmental resources, social relations, culture, and economic activities and explain how you could make a biofuel technology or water harvesting technology fit appropriately in such context

36. ## Physics

A 17 kg girl slides down a playground slide that is 2.7 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s. What is the coefficient of friction? Use energy theorem

37. ## Physics

How do you find the wavelength of the fourth harmonic of a closed pipe with length 2m?

38. ## Physics

What is tension of a string that is holding up an object in water equal to?

39. ## Physics

A fetus has a mass of 648 grams and a volume of 605m3. what should be the density of the amniotic fluid for the baby to feel comfortable?

40. ## Physics

A fundamental standing wave is produced in a pipe that is opened at both ends. The pipe is 0.50m long. If the speed of sound is 343 m/s, what is the frequency of that wave?

41. ## Physics

A block with a relative density of 0.7 is held under water. The buoyant force acting on the block is: a)greater than Fg b)equal Fg c) less than Fg d)equal to the force needed to hold it underwater.

42. ## Calculus

What are the solutions for 3cos2x=-3 if 0≤ x ≤ 2pi

43. ## Physics

A rocket is launched vertically with an acceleration of 20m/s^2. After two minutes its engines fail. Calculate the max height reached by the rocket and its total time in the air

44. ## Calculus

What is the difference between Cos(1/2)= and arcCos(1/2)=, why are they both equal to pi/3

45. ## Physics

When an object falls down why is acceleration of gravity not positive if both acceleration and velocity are both pointing in the same direction toward the earth and speeding up?

46. ## Calculus

What are two solutions of cosx=2/3 between 0 ad 2pi?

47. ## Calculus

For what values of x does the graph of the function y=4x^3+14x^2-2x-3 lie above the function y=2x^2-x?

48. ## Calculus

If the domain of a function y=g(x) is D=[-2,6] and the range is R=[-8,10], find the domain and range of the function y=I g(2x) I +1.

49. ## Physics

A box which has a mass of 32.8 kg is placed on a plane which is inclined at 40.0°above the horizontal. The sliding friction force acting between the box and the plane is 36.4 N. What is the acceleration of the box as it slides down the plane? (Ans:

50. ## Chemistry

Which has more molecules: 1.0 g of H2O or 1.0 g of H2O2? Why

51. ## Chemistry

How do you find the mass of a sample of air containing 78 mol of N2, 21 mol of O2, and 1 mol of Ar

52. ## Chemistry

How do you find the charge of the metal neodymium (Nd) in the following compound: NdCO3F

53. ## Physics

What is the direction and sign of acceleration in each case. A) stone was dropped from the top of a cliff. Neglect air drag. b) tennis player hits a ball with a racket. c) boy kicks in a soccer ball

54. ## Physics

When lifting an object vertically, would either Fn or Fg be longer on a free body diagram? Explain.

55. ## Physics

Using the position equation X=X0+Vot would a ball thrown upwards have a positive or negative gravity (m/s^2)?

56. ## Physics

On an inclined plane is Gravitation Force of x component (Fgx) always equal to static friction (fs)?

57. ## Chemistry

Using the significant figures rule, why is the answer to 8.000/532=0.0150 and not 0.015

58. ## Physics

On an inclined plane what is one example where Normal Force is larger than Gravitational and one example where it Fn=Fg?

59. ## Chemistry

Is drain cleaner dissolving a hair clog in the bathtub a chemical or physical change?

60. ## Physics

Three blocks have the same volume. Block #1 floats 50% submerged. It has a weight of 1 N . The two others sink, so they are suspended by cables. Block #2 experiences a 1-N tension force and block #3 a 2-N tension force. Calculate the weight of block #2 and

61. ## Physics

A ball is thrown up from a 10 -m-high cliff with an initial speed of 2.00 m/s. What is the speed of the ball just before it hits the ground? (The ground is defined as the bottom of the cliff.) Neglect air resistance

62. ## physics

A car tows a trailer which has a mass of 182kg. The car starts from rest on a horizontal road with an acceleration of 2.40m/s^2. As soon as the trailer starts to move a friction force of 64.0N acts on the trailer. Calculate the magnitude of the force which

63. ## physics

A rock is released from rest on a 700 m building and time is 11.95 what is the speed and velocity of the ball just before it hits the ground? I know you have to use the Vf=Vo+at formula but I was wondering why can I not use this formula as well:

64. ## Calculus

x= arccos(-√2/2) - cos(arcsin√5/3)

65. ## Calculus

Explain how to solve: cos(arcsin√5/3)

66. ## Calculus

Solve: log(2 cos(2x)+11)=1 where x e(0, 2pi)

67. ## math

MODELING REAL LIFE A diver is diving from a platform 10 meters above the water. The diver reaches a depth of 4 meters. What is the change in elevation of the diver?

68. ## Vectors

A vector of length 5 perpendicular to both u = (3, -1, 5) and v =(2, 1, 0) has what coordinates?

69. ## calculus

A particle moves along a linear path (left/right) and its position, relative to its starting location is given by the function s(t)=13t^3−2t^2+3t , t≥0. a) Determine the particle's velocity and acceleration at any time t. b) When does the particle

70. ## calculus

A Calculus student bought 20 m of flexible garden edging (shown in green). He plans to put two gardens in the back corners of his parents' property: one square and one in the shape of a quarter circle. He will use the edging on the interior edges (shown in

71. ## College Algebra

Use the function f(x) = 3 – x 2 to find a. f(-2) b. f( 2/3 ) c. f(a + 2)

72. ## science

which of these is responsible for ridding the body waste?

73. ## Language Arts

Identify a sentence that contains an action verb 1)She walked to the store with her best friend. 2) I am sometimes grumpy when I'm hungry. 3) They are heavier than they were before. 4) He is a major league baseball player.

74. ## Social Studies

Which statement BEST describes the cause of the Zulu War of 1879? A) The Zulu were threatened by Egyptian forces. B) The Boers fought against Zulu invasion at Blood River. C) The Zulu attempted to resist submitting to British rule. D) The British attempted

75. ## Math

What is -5g-6 for g=-2

76. ## physics

A thin stick of mass M = 2.0 kg and length L = 2.6 m is hinged at the top. A piece of clay, mass m = 1.0 kg and velocity V = 0.9 m/!@#\$%^&s the stick a distance x = 1.90 m from the hinge and sticks to itWhat is the ratio of the final mechanical energy to

77. ## physics

The rectangle shown has a mass, m. The sides are made of uniform thin wire. The short side is of length a, and the long side is of length b. If m = 10.50 g, a = 35.00 cm and b = 71.4 cm, what is the moment of rotational inertia about the axis indicated?

78. ## physics

A non-uniform bar of weight W = 20.0 N is suspended at rest in a horizontal position by two massless cords. The angle phi between cord 2 and the vertical is equal to 32.5o. The bar has a length L = 6.5 m and the distance of its center of gravity from the

79. ## physics

The system in the Figure is in equilibrium. A mass M1 = 221.0 kg hangs from the end of a uniform strut which is held at an angle theta = 42.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 31.0o with respect to the

80. ## physics

The system in the Figure is in equilibrium. A mass M1 = 221.0 kg hangs from the end of a uniform strut which is held at an angle theta = 42.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 31.0o with respect to the

81. ## physics

A particle moves in the xy-plane, starting from the origin at t = 0 with an initial velocity v0 = (20ˆi – 15ˆj) m/s and a constant acceleration of a = 4.0ˆi m/s2. Determine the particle’s speed and direction at t = 5.0 s.

82. ## physics

A car with a weight of 15 000 N is being towed up a 20o slope at constant velocity. Friction is negligible. The tow rope is rated at 6 000 N maximum tension. a. Draw the free body diagram, by cleverly choosing the coordinate system. (5 marks) b. Calculate

83. ## physics

(15 Marks) An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away. The coefficient of static friction between the person and the wall

84. ## physics

A moving 1.6 kg block collides with a horizontal spring whose spring constant is 267 N/m (see figure). The block compresses the spring a maximum distance of 7.0 cm from its rest position. The coefficient of kinetic friction between the block and the

85. ## physics

A 1500 kg block of granite is pulled up an incline that has an angle of inclination of 23 o with a constant speed of 2.03 m/s by a steam winch (see Figure). The coefficient of kinetic friction between the block and the incline is 0.29. How much power must

86. ## physics

A 485-kg crate hangs from the end of a 11.7 m long rope. You pull horizontally with a varying force to move it a distance d = 5.8 m to the right. What is the magnitude of the applied force F when the crate is at rest in its final position?

87. ## physics

With brakes fully applied, a 1340 kg car deccelerates from a speed of 96.0 km/hr. What is the change in the kinetic energy of the car?

88. ## physics

With brakes fully applied, a 1340 kg car deccelerates from a speed of 96.0 km/hr. What is the work done by the braking force in bringing the car to a stop?

89. ## physics

An aircraft uses a rocket-assisted takeoff unit (RATO) that is capable of discharging 49.0 kg of gas in 15.0 s with an exhaust velocity of 1300 m/s. The 3000 kg aircraft, on an ordinary takeoff without RATO, requires a distance of 440 m to reach a lift-off

90. ## physics

A bullet of mass m = 0.025 kg is fired with a speed of vi = 94.00 m/s and hits a block of mass M = 2.10 kg supported by two massless strings. The bullet emerges from the right side of the block with a speed of vf = 47.00 m/s. Find the height to which the

91. ## physics

A 22.0-kg body is moving in the direction of the positive x axis with a speed of 359 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 6.5 kg, moves away from the point of explosion with a speed of 387 m/s along

92. ## physics

wo blocks with masses m1 = 1.4 kg and m2 = 3.6 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 60.0 cm and has negligible mass. When both blocks are released simultaneously and the

93. ## physics

wo blocks with masses m1 = 1.4 kg and m2 = 3.6 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 60.0 cm and has negligible mass. When both blocks are released simultaneously and the

94. ## physics

Two 21.0 kg ice sleds are placed a short distance apart, one directly behind the other, as shown in the figure. A 3.42 kg cat, initially standing on sled 1, jumps across to sled 2 and then jumps back to sled 1. Both jumps are made at a horizontal speed of

95. ## physics

A 44-kg girl stands on a 7-kg wagon holding two 15.0-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 9.5 m/s relative to herself. Assuming that the wagon was at rest initially, what is the speed of the girl after she

96. ## physics

A radioactive nucleus of uranium-235 (mU = 235 u) decays spontaneously to thorium-231 by emitting an alpha particle (nucleus of a helium atom, symbolised α). The α particle (mα = 4.00 u) has kinetic energy 4.60 MeV. What is the kinetic energy of the

97. ## physics

Two blocks with masses m1 = 1.4 kg and m2 = 3.6 kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by 60.0 cm and has negligible mass. When both blocks are released simultaneously and the

98. ## physics

n aircraft uses a rocket-assisted takeoff unit (RATO) that is capable of discharging 49.0 kg of gas in 15.0 s with an exhaust velocity of 1300 m/s. The 3000 kg aircraft, on an ordinary takeoff without RATO, requires a distance of 440 m to reach a lift-off

99. ## physics

) A man holds a pail of water by the handle and whirls it around a vertical circle of radius 0.86 m at constant speed. What is the minimum speed that the pail must have at the top of its circular motion if the water is not to spill out of the upside-down