# Spencer

Most popular questions and responses by Spencer
1. ## Chemistry

Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH

2. ## physics EM

You have a 0.600-m-long copper wire. You want to make an N-turn current loop that generates a 1.30 mT magnetic field at the center when the current is 0.600 A. You must use the entire wire. What will be the diameter of your coil? this doesnt seem that hard

3. ## chemistry

0.10 M methylamine (CH3NH2) kb= 4.38e-4 calc the percent ionization so i did the ICE table to find that x=6.26e-3 and then i divided by .1 and then multiplied by 100. but i got the wrong answer whats did i do wrong?

4. ## physics

use the phythagorean theroem to answer this question. becca paddles a boat from the south bank of a stream to the north bank. She paddles at a rate of 8 mph. The stream is flowing west at a rate of 6 mph. what is beccá actual velocity. I need to

5. ## Physics E&M

A Geiger counter detects radiation such as alpha particles by using the fact that the radiation ionizes the air along its path. A thin wire lies on the axis of a hollow metal cylinder and is insulated from it. View Figure A large potential difference is

6. ## Physics E&M

Three electrons form an equilateral triangle 1.00 nm on each side. A proton is at the center of the triangle.What is the potential energy of this group of charges?

7. ## U.S. Government

"No person who may hereafter fight a duel, assist in the same as second, or send, accept, or knowingly carry a challenge therefor, shall hold any office in the State, for a period of ten years...." -Arkansas state constitution, Article 19, Section 2 Why

8. ## Physics EM

An ammeter is connected in series to a battery of voltage V_b and a resistor of unknown resistance R_u The ammeter reads a current I_0. Next, a resistor of unknown resistance R_r is connected in series to the ammeter, and the ammeter's reading drops to

9. ## Physics E&M

A proton and an alpha particle ( q= + 2e, m=4u ) are fired directly toward each other from far away, each with an initial speed of 0.01 c.What is their distance of closest approach, as measured between their centers?

10. ## Math

A fireman used a ladder with 56 rungs. The rungs are 14 inches apart and 1.5 inches thick. What is the distance from the bottom of the lowest rung to the top of the highest rung? Check if I solved correctly please. I multiplied 55*14 because there would be

11. ## science (6th)

please use the following terms in the same sentence- invertebrate, vertebrate and placenta. Thank you

12. ## Chemistry

Calculate the percent ionization of benzoic acid at the following concentrations: 0.00014 M i got 68% but it says its wrong

13. ## Anasazi

1) How where the Anasazi able to grow crops in their dry land?

14. ## physics EM

Shrinking Loop. A circular loop of flexible iron wire has an initial circumference of 167 cm, but its circumference is decreasing at a constant rate of 10.0 cm/s due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of

15. ## trig

(cotxsec2x - cotx)/ (sinxtanx + cosx) = sinx prove. i keep getting (if i start from the left side) = cosx instead of sinx please help!

16. ## Chemistry

The distribution coefficient between ether and water for aspirin at room temperature is 3.5. What weight of aspirin would be extracted by a single extraction with 60 ml of water from a solution of 10 grams of aspirin in 100 ml of ether? Calculate the

17. ## another EM

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.50-mm-diameter superconducting wire. What size current is needed? Thanks in advance

18. ## math

Basic unit of volume in the metric system; equal to 1.057 quarts. Is it A.centi- B.dec- C.gram D.liter E.meter F.milli-

19. ## Chemistry

As an eager scientist on a hot summer day you wish to determine how much ice to buy to add to your cooler which is filled with 4.0 × 101 cans of soda which are warm at 82.9°F. Each can has a mass of 378 g and ideally you want the temperature of the

20. ## Physics

An apple is placed 17.0 cm in front of a diverging lens with a focal length of magnitude 23.2 cm. What is the image distance i of the image of the apple through this lens? What is the magnification of the image of the apple? Wwhich of the following

21. ## physics EM repost

Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.50-mm-diameter superconducting wire. What size current is needed? Thanks in advance

22. ## math

Dr. Pepper left Oakville at 9:00 AM and drove to Central City at 60 km/h. H. Salt left Oakville at 11:00 AM and traveled the same route to Central City. If both men arrived at Central City by 4:00 PM at what rate did H Salt travel. We have to set the

A bomber flying horizontally at 250 m/s releases a bomb 1500m above the ground. At the point of impact, what were the horizontal speed and vertical speed?

24. ## Anasazi

Also, how did the Anasazi create homes that were adapted to their environment?

25. ## Physics

A driver brings a car traveling at 22m/s to a full stop in 2 seconds. How fast does the car uniformly decelerate?

26. ## PHYSICS!

A horizontal force of 10 N is applied to the outer edge of a door at an angle of 32° to the door, as shown in a view from the top looking down. The width of the door is 0.80 m. The magnitude of the torque of this force on the door with respect to the

27. ## PHYSICS

A driver of a 7400 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time? Neglect the weight of the driver, and assume

28. ## Chemistry

NEWW- 0.10 M methylamine (CH3NH2) kb= 4.38e-4 calc the percent ionization so i did the ICE table to find that x=6.62e-3 (that was a typo the first time) and then i divided by .1 and then multiplied by 100. but i got the wrong answer whats did i do wrong?

29. ## long physics E&M

A Geiger counter detects radiation such as alpha particles by using the fact that the radiation ionizes the air along its path. A thin wire lies on the axis of a hollow metal cylinder and is insulated from it. View Figure A large potential difference is

30. ## Physics

A bug is 12 cm from the center of a turntable that is rotating with a frequency of 45 rev/min. What minimum coefficient of friction is required so that the bug stays on the turntable?

31. ## math

I have a question on my math homework. The question is "half the perimeter of a garden is 18 feet. The garden is 8 feet longer than it is wide. How wide is the garden." How do i figure this put. urgent

32. ## Chemistry

What is the maximum mass of H2O that can be produced by combining 84.4 g of each reactant? 4NH3 (g) + 5O2 (g) -----> 4NO (g) + 6H2O (g) ___________ g H2O ?

33. ## Calculus

A spotlight on the ground is shining on a wall 24\text{m} away. If a woman 2\text{m} tall walks from the spotlight toward the building at a speed of 0.6\text{m/s}, how fast is the length of her shadow on the building decreasing when she is 2\text{m} from

34. ## Physics EM

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures.

35. ## Math

At a school with 100 students, 35 take French, 32 take German, and 30 take Spanish. Twenty students take only French, 20 take only German, and 14 take only Spanish. In addition, 7 students are taking both French and German, some of whom also take Spanish.

36. ## physics college level

A 2.0-kg block is projected up a frictionless inclined plane with a speed of 10 m/s. The angle of inclination is 30o . The block goes a distance of _____ up the plane before stopping. Assume g = 10 m/s2

37. ## Physics

In an Atwood machine, one block has a mass of M1 = 520 g and the other has a mass of M2 = 320 g. The frictionless pulley has a radius of 4.6 cm. When released from rest, the heavier block moves down 51 cm in 1.00 s (no slippage). What is the tension T1?

38. ## Chemistry Acid/bases

The concentration of H2SO4 in a solution is 3.20 10-6 M. Assume the acid dissociates completely in solution. What is the [H3O+] in the solution? What is the [OH-] in the solution? What is the pH of the solution? What is the pOH of the solution? OK SO I

39. ## Geometry

I've been working forever to figure out this problem! If two flagpoles are 10m and 70m tall and are 100m apart, find the height of the point where a line from the top of the first to the bottom of the second intersects a line from the bottom of the first

40. ## Social Studies

someone already posted something similar to mine but i think they're in my class and we have way different problems to work on... name if the following involve, seperation in powers, checks and balances, judicial review, federalism, or some combination of

41. ## physics EM

Which of the following choices of path allow you to use Ampère’s law to find B(r). 1. The path must pass through the point r_vec. 2. The path must have enough symmetry so that B(r)x dl is constant along large parts of it. 3. The path must be a circle.

42. ## Chemistry

Examine the redox reaction. As2O3(s) + Cl2(g) + H2O(l) → H3AsO4(aq) + HCl(aq) How many electrons are lost by each As atom during the reaction? A)4 B)3 C)2 D)1

43. ## Physics

golf club with a mass of 250 g travels at 50 meters per second hits a 40 g golf ball and continues traveling at 35 m/s. What is the speed of the golf ball after impact?

44. ## Pre-Cal.

Determine between which consecutive integers one or more real zeros of f(x)=3x^4+x^3-2x^2+4 are located? A. no real zeros B. 0 and 1 C. -2 and -3 D. -1 and 0 I was thinking it's either A or C? I need lots of help.

45. ## physics EM

Ive tried multiple answers but cant get it right. Which of the following changes would induce an electromotive force (emf) in the loop? When you consider each option, assume that no other changes occur. a. The magnitude of B_vec increases. b. The magnitude

46. ## Algebra

which factors would you multiply first to find the product of 2x5x3? Explain your reasoning.

47. ## Thermodynamics

A rigid insulated closed tank consists of two compartments of equal volume separated by a valve. Initially one contains air at 145 psia and temperature of 130 F, while second is completely empty(vaccum). the valve is opened and remains so until both are in

48. ## Physics E&M

A 68.0 g hollow copper cylinder is 90.0 cm long and has an inner diameter of 1.0 cm. The current density along the length of the cylinder is 1.60×10^5(A/m^2). What is the current in the cylinder? Ive tried many ways but am not getting the correct answer.

49. ## physics

hi can somebody help me with this?? a solenoid of length L and radius R carries a current I in its N turns. what is the total energy stored in the magnetic field within the solenoid? Compute the inductance L using the solenoid formula. You should be able

50. ## Math

105 students were asked if they liked soccer, rugby, or football. 4 liked only rugby, 40 liked rugby, 12 liked only rugby and football, 63 did not like football, 21 didn't like any, 16 liked only soccer and football, 60 liked soccer. How many liked only

51. ## Algebra 2

Standard form for both equation with steps 16x^2-96x+144+25y^2=400 16x^2+192x+576+25y^2=1600

52. ## physics

A car is moving at 37 m/s. It slams on its brakes and comes to a stop in 22 m. What was the acceleration from the brakes?

53. ## Trigonometry

Point P is located at the intersection of the unit circle and the terminal side of angle theta in standard position. Find the coordinates of P to the nearest thousandth.

54. ## physics EM

A 59.0 -turn, 4.10-cm-diameter coil with R = 0.530 {\Omega} surrounds a 1.70-cm-diameter solenoid. The solenoid is 21.0 cm long and has 170 turns. The 60 Hz current through the solenoid is I_sol = (.470A)*sin(2*pi*f*t). I guess f is the frequency. Find the

55. ## Physics E&M

A slab of metal of volume V is made into a rod of length L. The rod carries current I when the electric field inside is E.Find the resistivity of the metal?

56. ## Physics (Attempt 3 for help)

A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this

57. ## Math

105 students were asked if they liked soccer, rugby, or football. 4 liked only rugby, 40 liked rugby, 12 liked only rugby and football, 63 did not like football, 21 didn't like any, 16 liked only soccer and football, 60 liked soccer. How many liked only

58. ## Physics

Ann, Sam and you take a trip to the orbiting International Space Station, bringing along a hula hoop that is 1.02 m in diameter (= 2R) and has a mass Mh = 2.0 kg. You are watching from a viewport while Sam and Ann go outside for a (space) walk. You see

59. ## physics

Hi I need to know how much ground water presuure would be required to lift a 1.200m diameter plastic tank weighing 650kg out of the ground please, Please supply the answer in Kpa or psi Cheers

liam is planting 30 bean plants and 45 pea plants in his garden. If he puts the same number of plants in each row and if each row has only one type of plant, what is the greatest number of plants he put in one row?

61. ## SPANISH

I Need to write a letter to a girl in spanish for my spanish class. how do i start? how do i say, hi i really like you?

62. ## US history

was the bank war basically just the opposition of jackson towards the bank or was there mor to it? i already checked google.

63. ## naming chemical compounds

what is the dihydrogen phosphate ion? and the answer is not H2PO4-, H2PO4, HPO4... =(

64. ## physics

Zak, helping his mother rearrange the furni- ture in their living room, moves a 59 kg sofa 2 . 6 m with a constant force of 36 N. What is the work done by Zak on the sofa?

65. ## Physics

If a tank is standing up i.e 1.200 dia x 1.100 high with 650 kg inside, How much water pressure to lift it Cheers

66. ## MATH

HOW DO I FIND THE LEAST COMMON DENOMINATOR

67. ## algebra II

Convert to decimal notation 8.88 * x10^7

68. ## physics EM

using the Amperes Law The circle on the integral means that B(r) must be integrated A. over a circle or a sphere. B. along any closed line that you choose. C. along the path of a closed physical conductor. D.over the surface bounded by the current-carrying

69. ## repost physics E&M please

A battery with EMF 90.0 V has internal resistance R_b = 8.68 Omega. What is the reading V_v of a voltmeter having total resistance R_v = 485 \Omega when it is placed across the terminals of the battery? Express your answer with three significant figures.

70. ## math

If 7y-2x-5,then x=?

71. ## math

how long will it take to earn $787.50 on$5000 at 5 1/4%(percent) what is the rate it is compounded? annually, semi-annually, monthly, what? dat information is not given aren't you supposed to be using the interest rate formula? if so, then u have two

72. ## Chemistry

A solubility graph showing the solubility in grams of substance X in 100.0 g of alcohol. At 20 degrees Celsius, 24.0 grams of substance X will dissolve. At 50 degrees, 60.0 grams will dissolve. A saturated solution of X (s) in alcohol is cooled down from

73. ## physics

A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this

74. ## Fractions

would you eat more if you ate 1/3 of a small pizza or 1/3 of a medium pizza

75. ## history

How were the Pueblo people like the Anasazi???

76. ## Physics

On a sunny day, a 1.20 m long vertical stick in air casts a shadow 1.20 m long. If the same stick is held vertically and touching the flat bottom of a pool of salt water (n=1.71) half the height of the stick, how long is the shadow on the floor of the

77. ## Physics

Hi, I need to know how much ground water presuure would be required to lift a 1.200m diameter plastic tank weighing 650kg out of the ground please, Please supply the answer in Kpa or psi Cheers

78. ## Science

Compare and contrast the particle arrangement (density) of a solid, liquid and gas?

80. ## help interpreting a DBQ question- Us History

I have to write about the: constitutional, political and practical concerns of the Indian Removal act. i get the constitutional point but i don't understand what a political concern is or what a practical concern is is practical like they were afraid that

81. ## english

I need a summary on ch.13,14,15 on "Death on the Ice." by Cassie Brown I would really appreciate your help.

82. ## History

What article in the constitution does it state Who has the power to settle disputes involving the United States?

83. ## Chemistry

Why are smaller alcohols fully miscible with water while larger alcohols have lower solubility in water? A)In larger alcohols, the polar hydrocarbon chain cannot interact with non-polar water molecules and limits alcohol's ability to interact with water.

84. ## Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

85. ## Probability/Statistics

The teacher of a mathematics class has written up the final exam, but wants the questions to be random for each student. There are 28 students in the class, and the test has 100 questions. Each question has four possible answers. a. After reading carefully

96. ## earth space science

how are each of the air masses related and/or different from each other? Are you talking about the various layers of the atmosphere?

97. ## Chemistry

If a 300g sample of a substance has a half-life of 5 days, how much of the substance will decay after 22 days? A)293.4 g B)290.6 g C)285.8 g D)299.9 g

98. ## precalc

sine curve in the form of y = a sin(pi/2x) that passes through the point (2.5,-9.546)

99. ## boring history

why was the aztec civilization considered warlike???