1. Physics

A 4-kg sled sliding freely on an icy surface experiences a 2 _ N frictional force exerted by the ice and an air-resistive force of 0.5 N. a. What is the net force acting on the sled? b. What is the acceleration of the sled?

2. physics

A student pulls a 60.-newton sled with a force having a magnitude of 20. newtons. What is the magnitude of the force that the sled exerts on the student

3. Physics- Angular Momentum

A long thin rod of mass M=2.00 kg and length L=75.0 cm is free to rotate about its center. Two identical masses (each of mass m = .45kg) slide without friction along the rod. The two masses begin at the rod's point of rotation when the rod is rotating at

4. Physics

Take two Styrofoam cups, partially fill them with equal amounts of cold water, and drop equal amounts of ice into each cup to obtain a mixture of ice and water. a. Stir the water and ice mixture in one of the cups vigorously with a nonmetallic stirrer

5. chemistry

Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2766 kJ/mol) and H2

6. Chemistry

If the reaction of 2.5 g of Al with 2.5 g of O2 produced 3.5 g of Al2O3, what is the percent yield of Al2)3? Be sure to write and balance equation. 4Al + 302 ---> 2Al2O3 2.5 g Al x (1 mol Al / 108 g) x (2 mol Al2O3 / 4 mol Al) = .0115 mol Al2O3 .0115 mol

7. Physics

A 0.12-kg ball traveling with a speed of 40 m/s is brought to rest in a catcher's mitt. What is the size of the impulse exerted by the mitt on the ball?

8. Physics

A bowling ball has a mass of 6 kg and a speed of 1.5m/s. A baseball has a mass of 0.12 kg and a speed of 40 m/s. Which ball has the larger momentum?

9. chemistry

A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until its volume is 0.59 L. Calculate the work done (in joules) by the the gas if it expands (b) pressure of 0.20 atm. (C) If gas in

10. Chemistry

A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until its volume is 0.59 L. Calculate the work done (in joules) by the the gas if it expands (b) pressure of 0.20 atm. (C) If gas in

11. calculus

A cylindrical can is to be made to hold 100cm cubic.The material for its top and bottom cost twice as much per cm square as that for its side. The objective of this problem is to find the radius and the height of this cylinder such that its cost is

12. chemistry

On complete oxidation, one mole of an organic compound produced four moles of water. Which one of the following substances could it be? CH4 C2H6 C3H7OH C4H10 So I added O2 to each of these compounds, but I must be doing something wrong because I can't get

13. Diversity

Which onw of the following statements is NOT valid about the presence of a "mismatch between home and school?" a.There are differencein language & social communication patterns b.Children's early developmental foundations might be at risk. c.Literacy &

14. physics

Three charges are arranged in a line. From left to right, the charges are: Q1= -8mC, Q2 = +3mC and Q3 = -4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3.

15. biology can someone check

Decide if each of the following statements is true.If it is not rewrite the parentheses part to make it true. 1) Scientific methods include observation,(forming a hypothesis, and experiment). ans: false ;answer questions; solve problems 2)A statement that

16. English

11. How does Moishe the Beadle’s experience in the Galician forest change him? Your response should be at least one paragraph long. (2 points) 12. What is the irony of Elie’s and his neighbors' joy in leaving the hot ghetto? Your response should be at

17. trig

find the exact values of THE SIX TRIGONOMETRIC FUNCTIONS OF THE ANGLE THETA WHICH HAS A POINT ON THE TERMINAL SIDE OF (-1,4)

18. Physics

Consider an electron entering a region between two charged metal plates where, aside from the electric field E, there is also a constant magnetic field B directed into the paper. V is the velocity of the electron (from left to right direction). a)Write an

19. EnglishCOM

Write five sentences about the role of education in successful financial planning in the spaces on the following page. Correctly use a different verb tense in each sentence. Highlight each verb in yellow and identify the tense in parentheses. Education is

20. chemistry

32.5% ethylene cabonate is how much in milli litters

21. algebra

At a school store, 6 pencils sell for \$.99. At this rate, what is the cost of 16?

22. geometry

Find the approximate perimeter of triangle abc with vertices a(0,8 b(6,-2 c(-4,4

23. Math

5,590 Financed with finance charge of \$1693.77 with 36 payments. What is approximate annual per centage rate

24. biology can someone check

Identify each of the parentheses items as an independent or dependent variable. 1)The (number of red blood cells )independent in a mouse's blood at(different levels of iron) dependent in its diet. 20)The (amount of starch formed)dependent in a plant leaf

25. English

need help on the book night. 11. How does Moishe the Beadle’s experience in the Galician forest change him? Your response should be at least one paragraph long. (2 points) 12. What is the irony of Elie’s and his neighbors' joy in leaving the hot

26. chem100-1

Can eletrolysis be used to separate salt in the sea int o elemental sodium and clorine gas -- somthing like 2NaCl --> 2Na + Cl2 ?

27. calcus/ math

Nick has enough wire to construct a 100m of fence. he wish to use it to form three sides of a rectangular garden,one side is along his building. 1)What dimensions should be choose in order to enclose the largest possible area? 2)Verify the result thus

28. Calculus

Find dy/dx y = (x+y)/(x√2) I know that you can simplify the problem by arranging it to: y = (x)/(x√2) + (y)/(x√2) but I don't know where to go from here

29. environmental science

The earth's differentiation and size were significant factors for life on Earth because Earth's composition and gravitational attraction

30. us history

what are the similarties and differences of philosophies in the Articals of confederation and the constitution

financing furniture that costs \$4200.00 with a two year installment loan. The loan requires a 12% down payment and 24 equal monthly payments of \$195.00. According to this information, what would be the finance charge on the loan?

32. Physics

Consider a version of the atwood machine in which the masses are frictionless incline. The mass sliding on incline 1, m1, is 1.5 kg, and the angle of this incline is 62 deg. If the mass on the second incline, m2, is 2.5 kg, what is the angle 2 so that the

33. math

if you have a bill of 1.346 pesos how can you equal each person in 5 family per head? example.family of Joseph-3 family of Ben -2 family of Greg -4?

34. Physics

Which of these types of motors or engines are heat engines? a. an automobile engine b. an electric motor c. a steam turbine

35. science

calculate the momentum of a 2000-kg truck travelling 19m/s?

36. Drafting

In architectural drafting, you would indicate a brick surface on an elevation view using what?

37. english

some one help me to define phonetic symbol?

38. english

i need ideas about a reflective journal the subject is : the english class

\$5.50

40. Physics

A 0.4-kg ball has a velocity of 20 m/s. a. What is the kinetic energy of the ball? b. How much work was required to lift the box to this position?

41. English

Can you please check these sentences for me, please? Number 4 contains a run-on sentence I need to simplify. Thank you very much. 1) Victor created the monster with body parts selected from corpses chosen for their beauty. (??) 2) Victor created the

42. music

can u help me found a song that's online that has the music so i can play the song on my clarient it called bruno mars grenade can any1 help me found the music for that song on a clarient.... please

43. Soc312

What roles did Hamilton High serve at various points in its history? What factors caused those roles to change? How could Hamilton High have been more culturally responsive to diverse student groups?

44. Diversity

caregiver behaviors such as ignoring children'ssound babbling back to baby or repositioning the child on one 's lap are indicative of variable levels of a imitative play b. pattern training c. responsivity d.social awareness I CHOSE "c" AS MY ANSWER.

45. English

I forgot to include these sentences. I really hope you can have a look at them, too. 1)Frankenstein is composed of parts of dead bodies (of parts selected from corpses) 2)You forgot to introduce the element of fear when presenting the gothic fatures of

46. Sci

I am writing a peom on the element flourine and it should explain and the structure of the atoms that make up that element, explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally,

47. math

input output 1 5 2 8 4 14 8 ?

48. science

calculate the momentum of a 2000-kg truck travelling 19m/s?

49. Math

f you have a bill of 1.439 pesos how can you equal each person in 3 family in per head? example.family of Joseph-3 family of Daniel-2 family of charles-5?

50. physics

a convex lens of focal length 30cm is cut half perpendicular to its principal axes what is its new focal length

51. Physics

A hammer is used to pound a piece of sot metal into a new shape. If the metal is thermally insulated from its surroundings, will its temperature change due to the pounding?

52. Physics

Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine?

53. English

Thank you very much for your corrections. Here are some more sentences I'm unsure of. 1)The monster is an outcast, a rebel uncorrupted by society. He is different from anyone (else?) because of his ugly (revolting?) aspect. He becomes a murderer who kills

54. English

How do I diagram this sentence? "They were made more cruel by the exposure of their position aloft on high seats." I don't know what to do with "aloft on high seats."