# jon

Popular questions and responses by jon
1. ## Physics

A child throws a snowball at a tree and it sticks to the tree. Does this motion defy the Law of Conservation of Momentum? Explain. I'm thinking yes. Given that p(momentum)= mass x velocity, even though the tree is stationary, it would have a much greater

2. ## Physics

A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. a) What is the momentum of the

3. ## physics

A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? I don't understand the following explained by Quittich (sp)? "Since there is no vertical component, the time to

4. ## math

In a company there are 7 executives: 4 women and 3 men. 3 are selected to attend a management seminar. Find these probabilities. A) All 3 selected are men B) all 3 selected are women C) 2 men and 1 woman will be selected. D) 1 man and 2 woman will be

5. ## Physics

Two identical +9.0 µC point charges are initially spaced 5.2 cm from each other. If they are released at the same instant from rest, how fast will they be moving when they are very far away from each other? Assume they have identical masses of 1.0 mg.

6. ## Physics

A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden

7. ## Chemistry

Baking powder is stoichiometrically matched between baking soda and tartaric acid, and 1/3 of the mass of baking powder is baking soda -- this is because the molecular weight of cream of tartar is roughly twice that of baking soda. If the density of baking

8. ## USC

which of the following is true of quotation marks?

9. ## Science

If the specific heat of a marshmallow is 2 J/g, how much heat is given off when it cools from room temp (25C) to its liquid nitrogen bath. Weight of the marshmallow 7.4g

10. ## Trig(3 all with work)

1)Find the exact value of cos 105 by using a half-angle formula. A)sqrt 2 - sqrt 3 /2 B)-sqrt 2 - sqrt 3 /2 C)-sqrt 2 + sqrt 3 /2 D)sqrt 2 + sqrt 3 /2 cos 105 cos 105 = cos 210/2 sqrt 1 + 210/2 sqrt 1 + sqrt 3/2 /2 sqrt 2 + sqrt 3/2 which is D 2)Find the

A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.00 mm. What is the tensile modulus for this rod? 7.50 × 1011 N/m2 8.70 × 1011 N/m2 9.78 × 1011 N/m2 10.2 × 1011 N/m2 10.8 × 1011 N/m2

12. ## Physics

A cheetah can maintain its maximum speed of 120 km/hr for 38 seconds. What minimum distance must a gazelle running 74 km/hr be ahead of the cheetah to escape? A) 417.2 m B) 3778 m C) 624.3 m D) 485.6 m E) 1748 m

13. ## math

Robert spins the spinner and rolls a standard number cube. Find the probability that the spinner will stop on purple and the cube will show a six. The spinner has six equal slices, 1 purple, 3 green, 1 yellow, 1 red.

14. ## college math

A jet leaves a runway whose bearing is N26E from the control tower. After flying 4 miles, the jet turns 99 degrees and flies on a bearing of s55e for 6 miles. At that time what is the bearing from the jet from the control tower. I have no idea how to solve

15. ## chemistry

The specific heat of ice is 0.5 calories/gram. 60 grams of ice will require _____ calories to raise the temperature 1°C. so i just do 0.5/60 ??

16. ## physics repost

A player kicks a football with an initial velocity of 3.00 m/s at an angle of 60.0 above the horizontal. What is the horizontal distance traveled by the football? 2(3.00)(cos60)/9.80 (3.00)(cos60)(.530219635) 0.795m ___________________________________ "The

17. ## Language

What does the word keen mean in australian?

18. ## Physics

1)Which of the following statements is true about electric forces? A)electric forces cause objects to only attract each other. B)electric forces cause objects to only repel each other C)electric forces cause objects to repel or attract each other

19. ## Calc

A rotating beacon is located 1 kilometer off a straight shoreline. If the beacon rotates at a rate of 3 revolutions per minute, how fast (in kilometers per hour) does the beam of light appear to be moving to a viewer who is 1/2 kilometer down the

20. ## Math

A man goes 7m east and then 24m to south. Find his distance from the starting point

21. ## Gen Chem

At elevated temperatures, solid silicon reacts with chlorine gas to form gaseous SiCl4. At some temperature, the equilibrium constant for this reaction is 0.30. If the reaction is started with 0.10 mol of SiCl4 in a one-liter flask, how much Cl2 will be

22. ## chem

if a fractional distillation failed to separate two components efficiently, what alternatives would one consider to effect clean separation by distillation?

23. ## chemistry

Silver chloride can be prepared by the reaction of 100mL of 0.20M silver nitrate with 100mL of 0.15M calcium chloride. after the reaction goes to completion, what concentration of which ion remains in solution?

24. ## Physics

A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden

25. ## physics

A student lifts a 1.2 kg bag from her desk, which is 0.59 m high, to a locker that is 2.9 m high. What is the gravitational potential energy of the bag relative to the desk? PE=mgh 1.2(9.80)(2.9) = 34.1

26. ## math

1)Find the sixth term of the geometric sequence for which a1=5 and r=3 A)1215 B)3645 C)9375 D)23 I chose A 2)Write an equation for the nth term of the geometric sequence -12,4,-4/3... A)aN=-12(1/3)n-1 B)aN=12(-1/3)n-1 C)aN=-12(-1/3)-n+1 D)aN=-12(-1/3)n-1 I

27. ## Maths

Two identical jars are filled with mixtures of water and vinegar in the ratios of 2 to 1 and 3 to 1 respectively. If both jars are emptied into another container then the ratio of water to vinegar in the resulting mixture is.

28. ## math

80% of the American population likes pizza. If 8 Americans are chosen at random, find the probability that 6 of them like pizza.

29. ## science

The current classification system used by biologists is: A)Complex and unchanging. b)universally accepted by all biologists c)based on four generalized types of living organism: the bacteria, archaea, eukarya and protista d) updated and revised whenever

30. ## CHEMISTRY HELP!

Consider the following reactions and their equilibrium constants. (NO(g) + 0.5Br2(g) NOBr(g) Kp = 5.3 2NO(g) N2(g) + O2(g) Kp = 2.1 x 1030 Use these equations and their equilibrium constants to determine the equilibrium constant for the following reaction:

31. ## SMART Goals

Rewrite the following goal to make it S.M.A.R.T I want to do well in school this year. -I want to get As and Bs in all my subjects during my 10 month school year and be on the Role of Distinction. I will spend 2 hours everyday after school from 3-5

32. ## Chemistry

Sulfur trioxide dissolves in water, producing H2SO4. How much sulfuric acid can be produced from 12.1 mL of water (d=1.00g/mL) and 22.1 g of SO3?

33. ## Chemistry

Toy ovens made for children often use incandescent light bulbs as a heat source. Incandescent light bulbs are relatively inefficient at generating light. Approximately 95% of the energy they use is emitted as heat instead of light: that's bad for the

34. ## Trig

find the equation for the cosine function that has an amplitude of 3/5, a period of 3pi/2 and a y-intercept of 5.

35. ## Physics

You have a circuit with a 4 uF capacitor connected in series to 2 capacitors connected in parallel (2 uF and 1.5 uF). The battery is 12 V. The first question asked what the circuit's equivalence capacitance was. I calculated it to be 1.9 uF, which is

36. ## Physics

If 200g of water at 20˚ C is combined with 100g of water at 80˚ C, what is the final temperature of the 200g of water? How do you do this??? steps by steps??

37. ## IPC

Suppose all of the apples have a mass of 0.10 kg. If apple (A) is sitting on the ground, what is its potential energy? A) 0.10 J B) 9.8 J C) 0.0 J D) 1.0 J Would it be A?

38. ## Algebra 2

1)Find the exact solutions of the system of equations x^2 + 2y^2 = 18 and x = 2y. x=2y x^2+2y^2=18 (2y)^2+2y^2=18 4y^2+2y^2=18 6y^2=18 y^2=3 y=+-ã3 x=2(+-ã3) x=+-2ã3 (+-2sqrt3,+-sqrt3) 2)Simplify, (d/(d^2-9)) + (5/(2d+6)) [d / (d^2 - 9)] + [5 /

39. ## Physics

1)Four resistors of 10.0 each are connected in parallel. A combination of four resistors of 10.0 each is connected in series along with the parallel arrangement. What is the equivalent resistance of the circuit? A)80.0 B)40.4 C)40.0 D)42.5 I got C 2)A 2.00

40. ## physics

A missile launched at a velocity of 30.0 m/s at an angle of 30.0 to the normal. What is the maximum height the missile attains? sin 60 = 0.866025404 0.866025404 x 30 = 25.98076211 25.98076211 x 25.98076211 / 2 / 9.8 = 34.4 m

41. ## Algebra 2

an ice cream store has 31 flavors of ice cream and 10 toppings. A regular sundae has one flavor of ice cream, one topping, and comes with or without whipped cream. How many different ice cream sundaes can be ordered? I'm thinking 310 but how do i figure it

42. ## Accounting

The GoodTaste Club collected recipes from members and published a cookbook entitled Eat 'Em Up. The book will sell for \$18 per copy. The chairwoman of the cookbook development committee estimated that the club needed to sell 14,600 books to break even on

43. ## algebra

An airplane encountered a head wind during a flight between Rontown and Sawburgh which took 4 hours and 24 minutes. The return flight took 4 hours. If the distance from Rontown to Sawburgh is 1700 miles, find the airspeed of the plane (the speed of the

44. ## Science

A spherical rock rests at the top of a steep hill. the rock has A)Potential Energy B) Chemical energy C)Kinetic energy or D) no energy i think it's A or B but I'm not sure. thanks

45. ## Physics

A block with mass M rests on a frictionless surface and is connected to a horizontal spring of force constant k, the other end of which is attached to a wall. A second block with mass m rests on top of the first block. The coefficient of static friction

46. ## Chemistry 2

How many orbitals in an atom can have each of the following designations? (a) 3p (b) n=1

47. ## Physics

A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. a) What is the momentum of the

48. ## Physics

1)When the currents in two parallel metal conductors are in the same direction, the conductors ___ each other. A)attract B)repel C)do not exert any force D)exert forces that are perpendicular to I got A. I couldn't find where it talks about directions of

49. ## Math

Find the first five terms of the sequence for which a1=5,and an+1=3an+1. an+1=3an+1 a1+1=3a1+1 a2=3(5)+1 a2=16 a2+1=3a2+1 a3=3(16)+1 a3=49 a3+1=3a3+1 a4=3(49)+1 a4=148 a4+1=3a4+1 a5=3(148)+1 a5=445 so the first five terms are: 5,16,49,148,445

50. ## math

1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 A)15 B)15/2 C)-15 D)1/15 I chose A 5)Find the fifth term of the sequence in which a1=-3,and aN+1=3aN-n A)-301 B)-99 C)-193 D)-341 I don't know

51. ## Therrell

When measuring distance 12 beads are Approxmately equal to 6 erasers. How many erasers are equal to 18 beads? How many beads equal to 42 erasers?

52. ## physics

If a small planet were discovered whose orbital period was twice that of Earth, how many times farther from the Sun would this planet be?

53. ## FINANCE

Below is a list of account balances for Currie Hospital as of December 31, 2013. Prepare a balance sheet as of December 31, 2013, in proper form. (Hint: You will need to compute the net assets account. Assume that all net assets at the beginning of the

54. ## Algebra

Joan Arlington has twice as much money invested at 5% simple annual interest as she does at 4%. If her yearly income from the two investments is \$378, how much does she have at each rate?

55. ## Algebra

Mrs. Boyd has a desk full of quarters and nickels. If she has a total of 31 coins with a total face value of \$4.55, how many of the coins are nickels?

56. ## chem

The bottom of a box has a surface area of 31.4 cm2. The mass of the box is 47.1 kilograms. Acceleration due to gravity at sea level is 9.80 m/s2. What pressure is exerted by the box where it rests? how do i solve this?

57. ## to divide Monomials

Please help me with my paper algebra with Pizzazz! Page 76, objective 3-a. Name of paper is Why are babies like hinges?

58. ## Physics check

1)What can you say about the motion of a body if: a. its displacement-time graph is a straight line inclined with the time axis b. its velocity-time graph is a straight line inclined with the same axis. c. its velocity- time graph is a parabola A)The

59. ## physics

The melting point of a solid is 90.0 d/C. What is the heat required to change 2.5 kg of this solid at 40.0 d/C to a liquid? The specific heat of the solid is 390 J/kg-K and its heat of fusion is 4000 J/kg. I got 2 different answers 2 different ways:

60. ## physics repost

Venus has radius 6.05 x 10^6 m and mass 4.87 x 10^24 kg. Calculate the value of acceleration due to gravity on Venus's surface. don't know this one

61. ## Algebra II

Find: p(-3) if p(x)= x^5 + 3x^2. -3^5 + 3(-3)^2 -243 + 27 -216 (answer)

62. ## Math

1)The sum of a number and 17 more than twice the same number is 101. Find the number. 17+2n=101 17-17 101-17 2n=84 n=42(answer) 2)Evaluate: 5-/a+5b/ if a=-12 and b=2. 5-/-12+5(2)/ 5-/-12+10/ 5-/-2/ 5-2 3(answer)

63. ## Probabilty/Statistics

1)A coin is tossed 5 times. Find P(at most 4 tails.) A)3/16 B)13/16 C)1/32 D)31/32 I chose D 2)How many different arrangements of the letters of the word doodle are possible? A)180 B)720 C)15 D)90 I chose B For #3-5, use the following tepereatures from

64. ## marketing

Suppose I have developed a system for removing carbon dioxide, from the emissions of combustion process. But this process is expensive so that it would not be instantly adopted by all countries. I have to choose a country to start up this business. can you

65. ## chemistry check

A) Write a balanced chemical equation for the reaction between sulfuric acid and potassium hydroxide. I got H2SO4 + KOH ---> H2OH + KSO4 B) Write the ionic equation for the reaction. H2 + S2O4-2 + K + OH- ---> H2 + OH + K2SO4-2 C) Write the net ionic

66. ## chemistry-net ionic equations

Whats the net ionic equation for the decomposition of hydrogen peroxide (H202)? I know that it decomposes into water and O2 but is H202->H20+O2 the net ionic or does the H2 and O2 split up to be H2 + O2 -> H20+O2 and if so is the net ionic then just

67. ## Calculus

A science project studying catapults sent a projectile into the air with an initial velocity of 24.5 m/s. The formula for distance (s) in meters with respect to time in seconds is s = -4.9t2 + 24.5t. Find the time that this projectile would appear to have

68. ## physics

An object is released from rest at an unknown height h above the ground. One second later a second object is released from rest at the same height. When the first object strikes the ground, the second is 20 m above the ground. What is the initial height h?

69. ## Chemistry

As a purity check for industrial diamonds, a 22 - carat diamond (1 carat = 0.2g) is heated to 63 degrees C and immersed in 26g of water in a constant pressure calorimeter. The initial temperature of the water is 23 degrees C. Calculate the ΔT of the water

70. ## Chemistry

2C2H2(g) + 3O2(g) 4CO(g) + 2H2O(g) What is delta G° for this reaction in J/mol? (T = 298.17 K)

72. ## grammar

I am looking for the adverb clause in this sentence: It is difficult to travel through the huge expanse of parched sands in the Sahara Desert, where oases are plentiful but distance from each other.

73. ## Math

Write an inequality for the expression fourteen more than a number is at least 9. a. f+14†9 b. 14f†9 c. f+9†14 d. f-14†9

74. ## calculus

Find the equation of the tangent line to the curve y=sqrt(x) at x = c. Put the answer in slope intercept form y=mx+b. Use the definition of the slope of the tangent with no short cuts.

75. ## Chemistry

How many grams of NaCl should be added to 1 L of water to make an isotonic solution? (molecular weight of NaCl= 58.5) Can someone please explain to me why the answer is 9 grams.

76. ## science-VERY URGENT

I think it's A or C, but I need to know because it's due in an hour. Please help thank you, it's my last question on the homework. A flower is red, has a long tube formed by fusion of petals, has nectar at the bottom of the tube, has no landing platform,

77. ## science

In the reaction X+Y (R) Z, Z is the A)Substrate B)Product C)Enzyme D)Carbon Molecule

78. ## Science

Hi i have 3 questions I need help with please. Electrons are found A) in the nucleus of an atom. B) only in complex molecules. C) in a shell that surrounds the atom’s nucleus. D) in both the nucleus and inner shell of an atom. I think it's D. Individual

79. ## Science

Hi, I have two questions about biology I need help with. 1) Some questions fall outside the realm of science, which of the following questions could not be answered using the scientific method? A)What is the function of the appendix in human beings? B) Why

80. ## CHEMISTRY

Which of the following solutions contain the greatest total ion concentration? a) one mole of potassium chloride dissolved in 1.0L of solution b)one mole of sodium phosphate dissolved in 1.0L of solution c)one mole of ammonium carbonate dissolved in 1.0L

81. ## Biology

A cell that is entering the M phase of the cell cycle is: A. always diploid, either with duplicated or unduplicated chromosomes B. always haploid, always with duplicated chromosomes C. either haploid or diploid, always with duplicated chromosomes D. either

82. ## Music

European countries used different styles of colonial rule in the Caribbean. How did differences in colonial rule affect musical development in the Caribbean? Please help me with this question, I am getting really frustrated and don't know how to answer it.

83. ## Math

please go step by step to better understand if 2f(x)+f(1-x)=x^2 for all real numbers, the f(x)=?

84. ## Chemistry 3

For each of the following sublevels, give the n and l values and the number of orbitals. (a) 3s (b) 5f (c) 5g

85. ## organic chemistry

What is the newman projection of meso-2,3-dichlorobutane?

86. ## Physics repost

1)An ____ lens is used to produce a real image. A)convex B)concave C)plane D)diverging The link you gave me confused me b/c the closest thing I could find was convex. and you said concave mirrors produce virtual images. but the question doesnt ask for

87. ## Physics(Thank you)

1)Which of the following objects can set fire to a piece of paper in the presence of sunlight? A)doulble concave lens B)convex lens C)convex mirror D)concave lens B, convex lens 2)What happens to a path of a light ray parallel to the principle axis, after

88. ## Physics

True/False 1)Specular reflection obeys the laws of reflection while diffuse reflection does not. False. drwls said its true but I disagree can you please explain. 2)A convex lens is used to obtain an enlarged virtual image. True.

89. ## physics

1)For incomplete cancellation to occur, opposite pulses must have. A)equal amplitudes B)different energies C)equal pulses D)equal displacements I think there is a typo on A because my book reads: if the opposite pulses have unequal amplitudes, cancellation

90. ## physics

16)You are pushing a 55N lawnmower across the yard. Its handle makes a 55 degree angle with the ground. What force are you exerting on the handle? A)1 N B)67.1 N C)95.89 N D)3025 N I got C 17)Two men pull a 31 kg box with forces 9.7 N and 7.6 N in both

91. ## Trig

Find the exact value of: sin405. reference angle=225 sin225= -.707106781 = -.71

92. ## Trig

Rewrite 9pi/5 radians in degree measure. 9pi/5 =9pi/5(180/pi radians) =1620/5 =324 degrees

93. ## Algebra

Two cards are drawn from a standard deck of cards. Find the probability that a king or a red card is drawn?(4/52)*(26/52) 104/2704 answer 0.038

94. ## Math

Find the sum of a geometric series for which a1=1,r=2,and n=6. Sn=a1(1-r^n)/1-r S6=1(1-2^6)/1-2 S6=1(1-64)/1-2 S6=63/1 63 (answer)

95. ## Math

Triangle DEF with vertices D(2,5),E(1,-6), and F(-5,3) is translated 3 units right and 2 units down. Find the coordinates of D'E'F'. I added the x coordinates by 3 and added the y coordinates by -2 and got: D(5,3),E(4,-8),F(-2,1)

96. ## Math

Describe the system 6x-2y=10 and 9x-3y=8 as consistent and independent, consistent and dependent, or inconsistent. Explain. Answer: When you multiply the second equation by 2/3, both equations become equal. Therefore there are many solutions. The system is

97. ## Math

1)Find the standard deviation of the data set to the nearest tenth. (21,13,18,16,13,35,12,8,15) A)16.8 B)7.8 C)7.3 D)5.7 I chose C mean = 21+13+18+16+13+35+12+8+15/9 16.8 variance = (21-16.8)^2 = 17.64...did that with the rest and added them to get sqrt

98. ## Trig

Find the exact value of sin2(theta) if cos(theta) = -sqrt 5/3 and 180 < theta < 270. A)-1/9 B)-4 sqrt 5/9 C)1/9 D)4 sqrt 5/9 B? sin^2(theta) + cos^2(theta) = 1 sin^2(theta) = 1 - cos^2(theta) sin^2(theta) = 1 - (sqrt 5/3)^2 sin^2(theta) = 1 - (sqrt 25/9)