# Joseph

Popular questions and responses by Joseph
1. ## science

NH2-, NH3, and NH4+ have H-N-H bond angles of 105, 107 and 109. Explain this variation in bond angles.

2. ## Mathematics

Perfume is sold in two different sizes of bottle The 80ml bottle is priced at £55 The 50ml bottle is usually priced at £45, but is on special offer If you buy one 50ml bottle of perfume, you get a second for half price By calculating the price per ml

3. ## Physics

A man using a 70 kg garden roller on a level surface exerts a force 20 kgf at 45 degrees to the ground . Find the vertical force of the roller on the ground if he ; a) pulls the roller. b) pushes the roller.

4. ## mathematics

Also, use tables and not calculators. Finally, do not forget your units. 1. A ladder 20 METRES long rests against a vertical wall. The distance between the foot of the ladder and the wall is 9 METERS a. Find, correct to the nearest degree, the angle that

5. ## Physics

A bullet of mass 50g is fired with a velocity of (500,0)m/s in to a sack of sand of mass 20kg which is swinging from rope. At the moment the bullet hits, the sack has a velocity of (0,3)m/s. Workout the velocity of bullet and sack just after the bullet

6. ## Computers

What is one important feature of an AUP? A. a list of all available courses B. a clear outline of the consequences of violating the policy C. a permissive approach to internet usage D. a calendar for the academic year

7. ## Health

Identify two factors that affect your health that as a teenager you can control.

8. ## Math (Combinatorics)

In how many ways can I place 5 different beads on a bracelet if flipping or rotating the bracelet does not change the order of the beads?

9. ## math

The length of a rectangle is 5cm longer than the its breadth. Find the length and breadth if the perimeter is 26 cm

10. ## Geometry

Please help me!!! 1. Read the following paragraph from "From Behind the Veil." When she reached her room Siham could barely stop herself from laughing out loud. She picked up her veil and danced with glee, then stopped in the middle of the room and began

11. ## math

a ship drops its anchor into the water and creates a circular ripple. the radius of this ripple increases at a rate of 50m/s a) find an equation for the circle 10 seconds after the anchor is dropped i got x^2+y^2=500? is that correct

12. ## pre-al

If you roll a standard number cube 42 times, how many times do you expect the cube to show a six or an eight?

13. ## Physics

A spaceship of mass 2.1×10^6 kg is cruising at a speed of 5.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.8×10^5 kg , is blown straight backward with a speed of 2.3×10^6 m/s . A second

14. ## math

what number gives the same result when multiplied by 6 as it does when 6 is added to it?

15. ## Science

Concentrated phosphoric acid is 90% by mass and the remaining mass is water.The molarity of phosphoric acid in 90% is 12.2M at rtp. a)What is the density of the solution at rtp ? b)What volume (in mL)of this solution is needed to make a 1.00L solution of a

16. ## Math

An arithmetic progression has 11 as its first term and fourth term is 32.find the sum of the first nine terms.

17. ## science

Which statement is not true of simple machines? A.They can change the amount of work done on an object. B.They can change the distance over which you apply a force. C.They can change the direction in which you apply a force. D.They can change the amount of

18. ## physics

the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal

19. ## organic chemistry

Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with D2O

20. ## math

Trent earned \$28,500 last year. He paid \$8,265 for rent. What percent of his earnings did Trent pay for rent

21. ## physics

A 5.0 kg block of some unknown material is suspended from a spring scale and submerged in water.? The spring scale reads 39.3 N. What is the specific gravity of the block? I get 5051.5 kg/m^3 but its incorrect.

22. ## math

convert 101101two to a number in base ten.

23. ## Physics

Yo-Yo man releases a yo-yo from rest and allows it to drop, as he keeps the top end of the string stationary. The mass of the yo-yo is 0.056 kg, its moment of inertia is 2.9 X 10^-5 kg X m^2 and the radius r of the axle the string wraps around is 0.0064 m.

24. ## math

the 5 term of a gp is 4375 and the 2 term is 35 find (a)the 3 (b)the 6 (c)the sum of the first five terms

25. ## Math

A transversal intersects two lines. Which conditions would always make the two lines parallel? A) Vertical Angles are Congruent B) Alternate interior angles are congruent C) Corresponding angles are supplementary D) Same-side interior angles are

26. ## maths

solve the equation using cramer's rule. 3x+2y=12 and 2x+3y=7

27. ## Algebra

Write an equation for a function that has a graph with the given characteristics. The shape of y=^3 squareroot x is shifted 7.3 units to the left. This graph is then vertically stretched by a factor of 9. ​Finally, the graph is reflected across the

28. ## math

the volume of a rectangular prism is 2,058 cm3. The length of the prism is three times the width. The height is 14 centimeters. Find the other dimensions

29. ## chemistry

An optically active compound A, C6H10O2, when dissolved in NaOH solution, consumed one equivalent of base. On acidification, compound A was slowly regenerated. Treatment of A with LiAlH4 in ether followed by protonolysis gave an optically inactive compound

30. ## Chemistry

How many resonance structures do these following acids have? H2CO3-carbonic acid H3PO4-phosphoric acid H2SO4-sulfuric acid HNO3-nitric acid CH3COOH- acetic acid CH2ClCOOH- chloroacetic acid CHCl2COOH- dichloroacetic acid CCl3COOH- trichloroacetic acid

31. ## Physics

Steam of mass 11.0 g at 100°C is added to 114.8 g of ice at 0.00°C. Find the final temperature of the system.

32. ## chemistry

Sterling silver, an alloy of silver and copper, contains 7.5 percent copper by mass and has a density of 10.3 g/cm3. How many copper atoms are in a sterling silver sphere whose radius is 2.0 in?

33. ## chem

The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?

34. ## Math- Truth Tables

Construct a Truth Table for the given statement: 1. p implies ~(pVq) 2. ~(p AND q)Vp I thought this is how to do it, but my teacher marked it incorrect: 1. p q ~(pVq) p implies ~(pVq) T T F T implies T= T T F F T implies F= F F T F F implies F= T F F T F

35. ## Art

Van Gogh's Starry Night....how would you describe his use of lines, colors, shapes and textures I love that piece. How would you describe it? I will be happy to offer critisms and critique of your observations, however, I am not going to do your

36. ## Math

Make the subject of the formula U=1-3v over ut-w

37. ## physics

a stainless steel orthodontic wire is applied to a tooth.the wire has an upstretched length of 3.1cm and a radius of 0.11mm.if the wire is stretched 0.10mm,find the magnitude and direction of the force on the tooth.disregard the width of the tooth assume

38. ## math

if 1/2,1/x,1/3 are successive terms of an arithmetic progression. Show that 2-x /x-3 = 2/3.

39. ## language

Barbra Jordan believes that we must put our faith in children because?

40. ## Math

Five years ago, a father was 3 times as old as his son. Now, their combined ages amount to 110 years. Thus, the present age of the father is?

41. ## Math

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

42. ## Chem.

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius?? Okay...I don't really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 *

43. ## Chem.

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??

44. ## Physics

A 40-kg block is dragged along a horizonatl surface by an applied force as shown. The coefficient of kinetic friction is µk = 0.4 and the block moves at constant velocity. What is the magnitude of F ?

45. ## Chemistry

The initial concentration of NH3 in the zero order reaction NH3→3H2+N2 is 0.0312 M. After 30.0 seconds, the concentration of NH3 is 0.0302 M. What is the rate constant k for the reaction?

46. ## english

what is the meaning of the Root bell

47. ## stats

The controller for a garage door opener has nine binary switches that can be set to either on or off. How many different total settings can be set on this controller?

48. ## chemistry

Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)

49. ## Inorganic Chemistry

Which of the following species contain an inversion center? Choose all that apply. SeF6 [IF4]- SnF4 InH3

50. ## Inorganic Chemistry

Which of the following species contain a C4 axis and a σh plane? Choose all that apply. [ICl4]- SiCl4 XeF4 GeH4 [PO4]3

51. ## physics

A uniform horizontal bar of length L = 5 m and weight 243 N is pinned to a vertical wall and supported by a thin wire that makes an angle of theta = 39o with the horizontal. A mass M, with a weight of 300 N, can be moved anywhere along the bar. The wire

52. ## spanish/another question

Choose the best word Sernoritas, ustedes (vino, vinieron) answer vinieron is it right?

53. ## Science

The cirucumference of a ballon is 75 inches and the diameter is 12 inches what is the volume? Science - Ms. Sue, Saturday, February 18, 2012 at 9:54pm Thank you. volume = 4/3 ð r3 V = (4/3) * 3.14 * 6^3 V = (4/3) * 3.14 * 216 V = (4/3) * 678.24 V = ? I am

54. ## Calculus

Find the point on the line 2x+7y-6=0 which is closest to the point (-5,5.

55. ## physics

A child pedals a tricycle, giving the driving wheel an angular speed of 0.373 rev/s. If the radius of the wheel is 0.260 , what is the child's linear speed?

56. ## Math

The length of a rectangle is twice its width if the area of the rectangle is 200 m squared, find its perimeter.

57. ## Statistics

A student studies for a statistics exam where all questions are true or false. A reputable source indicates that with studying the student has a 90% chance of answering each question correctly. There are only three questions on the test. What is the

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.030 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.055 kg and is initially at rest. The

starting with an initial speed of 5.00 m/s at a height of 0.265 m, a 1.75 kg ball swings downward and strikes a 4.45 kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.75 kg

60. ## Science

which of the following are predicted by the molecular orbital model to be stable diatomic species N22-, O22-, F22-

61. ## chemistry

write the net ionic equation for the following : 2CuCl(aq)-> CuCl2(aq)+ Cu(s) 4NaCl(aq)+2H2SO4(aq)+MnO2(s)-> 2Na2SO4(aq)+2H2O(l)+Cl2(g) 3KOH(aq)+Fe(NO3)3(aq)->Fe(OH)3(s)+ 3KNO3(aq)

62. ## Chemistry

A gaseous mixture of O2, H2, and N2 has a total pressure of 1.50 atm and contains 8.20 g of each gas. Find the partial pressure of each gas in the mixture They don't give you Volume and Temperature. Please explain it to me, thank you!

63. ## chemistry

For the reactions that occurred spontaneously in the individual tables, balance these reactions assuming they are in an acidic solution. Reaction 1: Cu I^- Ag Br^- Reaction 2: Zn Pb Cu Ag Reaction 3: Cl2 Br2 I2 Reaction 1 I 2(aq) Cu2 + (aq) Ag + (aq) Br2

64. ## chemistry

Reaction 1: I2(aq)Cu^+2(aq) Ag^+(aq)Br2(aq) Column 1---Column 2---Column 3---Column 4---Column 5 I-(aq)---X---X---T---T Cu(s)---T---X---T---T Ag(s)---X---X---X---T Br-(aq)---X---X---X---X Reaction of metals and solution of ions Reaction 2:

65. ## legal and ethical environment of business

For the past ten years, DWI has wanted to develop the lucrative Iraqi oil reserves for its exploration, drilling, refining, and transport division; DWI's Oil Division has been limited to Siberia and the South China Sea up to this date, and was precluded

66. ## physics

A ball thrown with a speed of 100m/s attains a height of 150m calculate the angle of projection

67. ## algebra

how do you simplify |4x + 8 - 10| ≥ 6 ? because i got x ≤ 2 and x ≥ -6 as the answer. But, someone else got x ≤ 2 and x ≥ -1.. (because they simplified by subtracting 8 to 10) (it is absolute value) so, i thought that you would add 10 to 6 to

68. ## Algebra 1

A 10 meter rope is cut into two pieces so that one piece is equal to 5 meters longer than 4 times the shorter piece find the lengths to both sides

69. ## 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

70. ## Functions

Milk is leaking from a carton at a rate of 3mL/min. There is 1.2 L of milk in the carton at 11:00 a.m. How much will be left in the carton at 1:00 p.m.? f(x)=1200-3x

71. ## Physics

A wet bar of soap slides freely down a ramp 17.0 m long, inclined at 38.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)

72. ## math algebra

Sum the following term of progression to the last term, logx, logx^2 logx^3.... logx^120

73. ## Physics

A 15 ft plank of mass 50 kg is laid across two ladders. The ladders are 5 ft apart, and the plank is laid such that 5 ft of it hang off at each end. You have a mass of 90 kg. (a) How far out past the ladder can you walk before it gets dangerous? I tried

74. ## Math

Convert to an exponential equation. log Subscript w Q=13 Thanks

75. ## math

a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point.

76. ## Physics

An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?

77. ## Math

11 + 2z= 14.78 Find the variable

78. ## Math

14 + y/8 = 10 What is the variable?

79. ## Math

13+d=44 What does the variable represent

80. ## Math

5/6 (2g+1)-g Simplify the expression

81. ## Math

Two even integers are represented by 2n and 2n+2. Explain how you can find the value of those integers if their sum is 14. Name the integers.

82. ## MATH

You are asked to calculate the weight that a hotel elevator can safely carry. You should expect your answer to be

83. ## Math

If the value of a car decreased by 10 percent and is now worth \$ 21,000. What was the original cost of the car?

84. ## Math

If a car decreased by 10 percent and is now worth \$14,000. What was the original price of the car

85. ## Physics

Michael Jordan has the record for the highest vertical jump at 48 inches (1.22m). While on the ground, he speeds up over a distance of 0.6 m to achieve the necessary launch speed. What acceleration does his legs provide in order to achieve his height?

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87. ## Regent University

A point charge of 0.5 is brought to a point a in free space. How much work is required to do this?

88. ## Chemistry

How energy is needed to vaporize 100 g of ethanol from its boiling point?

89. ## math

A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads

90. ## statistics

A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads

91. ## mathematic

a bag contains 3rdmarbles, 2white and 3green a boy takes at one marble at random. what is the prob that it is either red or white?

92. ## physic

In a serious accident, a nuclear power plant's reactor vessel cracks, and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat

93. ## physics

A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? c_metal =____ J*kg*C?

Muscular dysgenesis or dysgeny is a lethal, recessive, genetic disease of mice that is caused by a mutation in the mdg gene. Skeletal muscles from dysgenic mice are paralyzed and the animals die shortly after birth. You are a research scientist interested

95. ## science

A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 15 kg cart is moving at 3.0 m/s afterward. How fast is the 10.0 kg cart moving?

96. ## math

jewelry marked 14 karat gold is 14/24 pure gold. what is the percent

97. ## Physics

A 2.2m of steel wire hangs vertically down from a support. A 1.5m length of brass wire of the same diameter is attached to the lower end of the steel wire.when a 10 kg mass is attached to the lower end of the brass wire a total extension of 0.05 m is

98. ## chemistry

What volume of oxygen at s.t.p is required for the complete combustion of methane according to the following equation. CH4 2O2= CO2 2H2O

99. ## Physics

A toy train is moving on a track from right to left. You are told that work is the dot product of force and displacement. In what direction would you apply a force so that you do the most negative work on the train? a)You would apply a force that is in the