n

Most popular questions and responses by n
1. physics

A 0.10 kilogram ball dropped vertically from a height of 1.0 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is aprox. a. 0.080 J b. 0.20 J c. 0.30 J d. 0.78 J

2. Chemistry

A sample of nitrogen occupies a volume of 300ml under a pressure of 380 torr at -177C. What would be the volume at STP? I know the answer is 430mL but I don't know which equations to use to formulate the calculation.

3. physics

a block of mass 3 kg rests on a smooth table and connected to another block of mass 2 kg, after passing over and ideal pulley, the block of mass 2 kg is released. how long does it take the block to travel 80 cm

4. Math

The 112th Congress of the United States of America has 535 members, of which 87 are women. An alien lands near the US Capital and treats members of Congress as a random sample of the human race. He reports to his superiors the 95% confidence interval for

5. math need help ASAP

use benchmark to estimate the sum 3/5 + 3/17

6. Physics

A charge q1 of -5.00*10^-9C and a charge q2 of -2.00*10^-9C are separated by a distance of 40.0cm. Find the equilibrium position for a third charge of 15.0*10^-9C

7. Chemistry

The molten lead obtained from the blast furnace contains 0.1% of silver dissolved as an impurity. The silver is removed by: -adding zinc to the mixture of molten lead and silver at 350'C and removing the mixture of molten zinc and silver that forms on top

8. Physics

A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and incline is 0.10. Find the force

9. physics

An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval? a.5.3 m/s2, upward b.2.0

10. Science

A boy moves on a skateboard at a constant velocity of 3m.s . The combined mass of the boy and the skateboard is 40kg. He catches a bag of flour of mass 5kg that is thrown to him horizontally at 6m.s . Determine the velocity of the boy after catching the

11. math

Elizabeth has 1 7/10 as many plants as rosalie has in her garden. If Elizabeth has has 51 plants, how many plants does rosalie have in her garden?

12. physics

Before starting this problem, review Conceptual Example 7. The force vector A has a magnitude of 97.0 newtons (N) and points due east. The force vector B has a magnitude of 107 N and points 71.4 ° north of east. Find the (a) magnitude and (b) direction of

13. Chemistry

A 35.00 mL sample of water at 30.0°C is placed in an open container with an external pressure of 1.00 atm. 30.0 kJ of heat is added to the water sample. The density of water is 1 g/mL. (a) How many grams of liquid water remain at the end of the process?

14. Chemistry

The Haber process is used to synthesize ammonia (NH3) from N2 and H2. The change in standard Gibbs free energy is ΔG°rxn = -16 kJ/mol A. Calculate the equilibrium constant for this reaction B. Calculate the ΔGrxn when you have 2 atm of NH3 (g), 2 atm of

15. physics

A stone is dropped from rest at the top of a mine shaft. It takes 58 s for a stone to fall to the bottom of a mine shaft. How deep is the shaft? The acceleration of gravity is 9.8 m/s2 .

16. math

The mean age of the 43 presidents of the United States (as of 2011) on the day of inauguration is 54.6 years, with a standard deviation of 6.3 years. A researcher constructed a 95% confidence interval for the mean age of presidents on inauguration day. He

17. chem 161

What volume of 0.114 M NaOH are needed to neutralize 25.0 mL of 0.250 M H3PO4?

18. Physics

An 80.0 kg rollerblader is at rest at the top of a 100 m hill at a 7o incline. The coefficient of friction on the hill is 0.110. What is the roller blader's kinetic energy at the bottom of the hill?

19. math

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

20. Social Studies

what was the first of two important changes that marked emperor Constantine's rule

21. Chemistry

Elements A and B combine to form two different compounds. The first compound contains 15.0 grams of substance A, and 8.60 grams of substance B. It can be represented by the formula A2B (subscript 2). The second compound contains 5.0 grams of substance A,

22. math

what is the process for solving the following question? John is 72 inches tall and casts a 40 inch shadow. A monument casts a 24 foot shadow. How tall is the monument?

23. stat

three boxes contains 12 electric bulbs in each one box(1) contains 4 defective bulbs box (2) contains 3 defectives bulbs Box (3) contains 5 defectives bulbs a box is selected randomly and one bulb is drawn 10 what is the probability that the selected bulb

24. chem 161

What mass of precipitate will be formed when 25 mL of 0.532 M silver nitrate is mixed with 25 mL of 0.333 M NaCl?

25. Langston Hughes Dream Deferred

Hello! My assignment: Analyze the poetic techniques that allow the poet to communicate his tone. Use the terms from this unit as effectively as you can. Here is my analysis. Does it sound alright? In the poem “Dream Deferred”, Langston Hughes uses a

26. chemistry

The breakdown of p-nitrophenylphosphate at pH 2.6 is a first order hydrolysis process.. a) 12.5mmol of NPP were dissolved in 200mL of water at 77degrees celcius after 50mins the amount of NPP dropped to 10mmol. Calculate the average rate of this reaction

27. math

complete the pattern starts at 0.22 _ _ _ ends at 0.84 fill in the blanks

28. Rate and Sped Algebra

It takes Sisyphus two days to carry a pile of rocks up a hill. When I helped out, it took us only 1.2 days to carry all of the rocks. How long would it take me to carry the rocks by myself?

29. Physics

A force of 35.0N is exerted onto a 12.0kg block and the block moves 42.0m. How much work is done?

30. english

What are three central assumptions of the american dream

31. Chemistry

A flexible balloon containing 1.5 mol of... ideal gas at constant pressure of 1.5 at... 100 °C. Calculate the change in intern...‡ (ΔE) of the gas.

32. math

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

33. chemistry

When hydrazine (N2H4) is burned in a 259-g brick container, the temperature of the brick increases by 5.13 C. Calculate the quantity of heat released in this reaction. The specific heat of the brick is .840 J/(g C)

34. math

factor 6x^2+17xy+12y^2

35. Pottery

how do the poetic elements increase my interesting in the poem of "How I Learned English"

36. Discrete Math

So, the question I got was: ∀x,(x =/= 0) → (∃!y, xy = 1) I'm really confused about what the "∃!y" means in this context, because the way I'm interpreting the question is: "For all x (when x is not equal to 0), there does not exist a y such that x*y

37. science

if you have two samples of the same volume. the mass of sample A is higher than that of sample B. which sample has the greatest density?

38. Math

The m angle is 30 times more than twice angle B. If angle A and angle B form a linear pair find the measurement of both angles.

39. math

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 2A (amperes), the resistance is 115ohms. What is the resistance when the current is 5A ?

40. math word problem

The city council has decided to add a 0.3% tax on motel and hotel rooms. If a traveler spends the night in a motel room that costs \$55 before taxes, how much will the city receive in taxes from him?

41. Trig

(tan/cot)- (sec/ cos) Also I need help with tan sin +cos = sec

42. Trig

(Cos/1-sin)- tan

43. Trig

Tan^2= csc^2 tan^2 -1

44. Trig

(Tan/cot)- (sec/cos)

45. Trig

(Cos/1-sin)- tan

46. english

what photographe is famous for images of Dust Bowl victims

47. english

what two things happened in the prohibition period that had to do with oceans

48. science

Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

49. science

Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

50. science

what type of crime scene is most likely to contain toolmarks

51. Science

Please help!!! You mix 100 millimeters of 10 degrees Celsius water and 100 millimeters of 90 degrees Celsius water. What is the final temperature?

52. Math

What is this written in postfix notation: !(!((5-10)*(4-(9/2)) > 60)-(((5*7)/(4/(5+3)))=15))

53. physics

A box has a mass of 0.345 kg. It is on a very smooth (frictionless) horizontal surface and is acted upon by a force of 3.76 N at an angle of θ = 57.1° with the horizontal. The magnitude of the acceleration of the box is m/s2?

54. Grammar

What kind of paragraph is this? Descriptive, Narrative, or Expository? The place I would like to visit most is heaven. Having the opportunity to be in a place with no sickness, suffering, or misery would be paradise. To eat dinner with Jesus Christ would

55. MATH

2BOYS:7GIRLS=5BOYS:?GIRLS OPTIONS ARE 24,25,124,15 PLEASE CALCULATE IT.

57. English

I'm working on a complements assignment, and I understand what they are, but I'm a little thrown off by something: Take the sentence, "At first this Saturday had been a warm, sunny day." Saturday is the subject, had been is the verb phrase, and the

58. Calculus

How would you go about finding the derivative of y=1/(3x^2)-5/(2x)?

59. Organic Chemistry

Design a procedure to separate a mixture of alcohols containing methanol, ethanol, 1-pentanol. Explain, with references to intermolecular forces, why this separation method is effective in this situation.

60. math

A reciepe for tomato and pasta salad calls for 32 ounces of tomatoes and 4 cups of pasta.the recipe makes 8 Servings.If you only wnat to make enough for 2 servings, how much of each ingredient should you use/

61. college

Q. A soccer ball is kicked from the ground. When it reaches a height of 5.74 m, the velocity is v=5.86i+7.50j m/s. a) Determine the maximum height that the ball reaches. b) Determine the total horizontal distance travelled by the ball. c) What is the speed

62. AP US Government

What features of the Constitution make it difficult for government to do or achieve anything? Why were they included? *That is the question, but I am completely lost on how to answer it.

63. science

a 50kg crate is lifted to a height of 10 meters how much potential energy does the crate have after being lifted?

64. math

If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for the to pain the house together?

65. Chemistry

What is the diameter of a potassium atom?

1. chemistry

n

posted on April 10, 2019
2. Math

m

posted on April 2, 2019
3. ELA

Im not sure about these answers but I put 1.personfictaon 2.The air was filled with the intense scent of many flowers 3.lines 1 and 2 4. The flower patch is round and compact 5.smell 6.delighted 7. The sun shined on the orchises and their spears 8. four

posted on March 28, 2019
4. ELA

Mines is Lesson 19: Rhythm and Rhyme Unit Test and its Unit 2

posted on March 28, 2019
5. Language Arts

):

posted on March 27, 2019
6. ELA

Can someone finish the test and give the real answer and hurry because I'm failing In ELA.

posted on March 27, 2019
7. Math

1.C 2.D 3.B 4.C 5.A 6.D 7.C 8.C 9.B 10.A, B, D

posted on March 26, 2019
8. algebra

Where does the 102400 come from

posted on March 12, 2019
9. Expected Value?

b

posted on February 11, 2019

7 is what?

posted on January 26, 2019
11. Math

dfghjkl;

posted on January 19, 2019
12. calculas

Use left and right endpoints and the given number of rectangles to find two approximations of the area of the region between the graph of the function and the x-axis over the given interval. (Round your answers to four decimal places.) g(x) = 4 sin x, [0,

posted on November 27, 2018
13. Social Studies

thx lun

posted on November 7, 2018
14. physics

m

posted on November 6, 2018
15. physics

n

posted on October 30, 2018
16. English - The Red Badge of Courage

y’all are so dumb 50% of these are wrong

posted on October 26, 2018
17. Math

The alien's report: The population of Earth is adequately large, we assume this is an SRS, and with p-hat being approximately .16, n*p-hat and n*(1 - p-hat) are both greater than 10. Therefore we can use the normal curve. We will use the confidence

posted on October 9, 2018
18. Math-Statistics

Normal percentiles for common confidence levels Confidence level 80% 90% 95% 98% 99% z∗ 1.282 1.645 1.960 2.326 2.576 .195 ± 1.645(.009) .195 ± .014805 0.180195 to 0.209805

posted on October 3, 2018
19. maths

posted on June 3, 2018
20. Chemistry

n n

posted on May 21, 2018
21. Health

What answer is it? A B C or D?

posted on May 7, 2018
22. P.E/Health

smile more is right

posted on May 2, 2018
23. Social studies

correct

posted on April 30, 2018
24. Social Studies

C A b

posted on April 30, 2018
25. Science

C B B D is correct

posted on April 29, 2018
26. Science--HELP!!

C B C A A

posted on April 29, 2018
27. Science

Correct @yolo.

posted on April 29, 2018
28. math functions

unit 5 is correct for connexus

posted on April 27, 2018
29. Math "Need Help Asap"!

sierra correct

posted on April 27, 2018
30. math

dONT LISTEN IT DOESNT WORK I SWEAR TO GOD

posted on April 27, 2018
31. PHYSICS

41

posted on April 25, 2018
32. Physics

jj

posted on April 5, 2018
33. math

.40

posted on April 2, 2018
34. Physics

50 m/s is faster than 140km/h

posted on March 27, 2018
35. Chemistry

-277

posted on February 10, 2018