# Science

1. Science
How much effort force would you have to use to lift a 800 newton load using a pulley system with a mechanical advantage of 4?
2. science
A 1600kg car starts at rest and reaches 40 m/s in 6 seconds. I need to find: a) the change in kinetic energy b) work c) distance d) applied force of the engine
3. Science
A ball is dropped from a height of 20 meter and rebounded with a velocity which is 3/4 of the velocity with which it hits the ground. What is time interval between the first and second bounces?
4. science
What is the molarity of 7.30g HCl
5. Science
The u.s. constitution provides that each of the three branches of the federal government has certain powers that can limit the powers of the other branches. These limitations are known as the system of checks and balances. Which of the following actions is a check by the ...
6. science
In the hydraulic lift in the illustration, the car on the one side of the lift can be lifted by applying an effort force to the opposite side of the lift. If the effort force applied (F1) was 900 N on the 1 m2 area (A1), what is the load force of the car (F2) if the area (A2) ...
7. Science Pls Help
How is an areas topography determined? A. by using an ares long. and lat. B.by using an areas scale c. by using an areas elevation relief, and land forms*** d. by using an areas elevation, long. and lat.
8. science (physics)
A body travels 10m in 5th second and 30m in 10th second. Find its initial velocity and acceleration.
9. Science
What quantity of Caco3 must be heated to give sufficient amount of Co2 to convert 10.6 gms of Na2Co3 completely into NaHCo3 ?
10. Science
And ice cube Wayne 1 g is placed in our closed insulated container with 9 g of water at 20°C 68°F after 24 hours elapse the container will hold what (1) ten grams of water (2) one gram of ice and nine grams of water (3) five grams of ice and five grams of water (4) nine ...
11. Science
Which of the following substances would be most effective in relieving pain caused by a man- of- war (1) tap water (2) club soda (3) lipstick (4) perfume (5) lemon juice
12. Science
If all of the nematocysts on a mature man-of-war were filled with poison, what is the total amount of poison ( in milligrams) they would contain? It takes 24,000 nematocysts to release a single milligram of poison. (1) less than one milligram (2) two milligrams (3) five ...
13. Science
which of the following is true about kinetic energy select all that apply A as an objects speed increases kinetic energy decreases B only moving objects have kinetic energy ••• C kinetic energy increases as an objects height increases D kinetic energy depends on an ...
14. science
How would you separate a mixture of small beads, sand, iron filings, salt, and water, using a magnet, filter funnel, filter paper, bunsen burner and a tripod with a bunsen burner? I thought of Filtration, Evaporation, Distillation, Magnetism, and even Sieving but only 4 of ...
15. Science
A family is planning to build a raised planting area using a blend of peat moss, mulch , and a rich organic soil in which to grow the plants. They have been told first to place on the ground a layer of material that will allow for a proper drainage each time the plants are ...
16. Science
Does nano3 turns phenolpthalein indicator pink?
17. Science
It is winter where Jenna lives. It’s been snowing all day, but now the snow has changed to sleet and then to freezing rain. What is happening at Jenna's house then- temperature-wise?
18. Science
Which of the following solutions would have the highest boiling point? (1) 5 liters of water (2) 5 grams of salt dissolved in 4 liters of water (3) 10 grams of salt dissolved in 3 liters of water (4) 15 grams of salt dissolved in 2 liters water (5) 20 grams of salt dissolved ...
19. Biology
what are goals of science? Choose all that apply. A) to investigate the natural world B) to establish unchanging facts C) to explain natural phenomena D) to make useful predictions based on evidence
20. science
Ricardo finds an online site about the gas laws. The site shows the equation below for Charles’s law. What change would correct the error on the site?
21. Science
Why the ball of ventrical is thicker than the ball of atrium
22. Science
Clasify this reaction Zn(s) + 2HCl(aq)-ZnCl2(aq)+H2(g)
23. Science
Water condenses on the grass in the early morning help
24. science
describe briefly how you would prepare a 0.2M solution of KOH in 250cm flask
25. Science
A kitchen ceiling light has five lightbulbs on it. When one of the lights goes out, the other four will stay lit. This is an example of a series circuit. True or False I think FALSE because a series circuit would make them all go out.
26. Science
How are fossil fuels formed? A:They are formed from the metamorphosis of rocks deep underneath the ground. B:They are formed from the remains of organisms that were buried and altered over millions of years. C:They are formed from hydrocarbons that react with oxygen.**** D:...
27. Science
1g mixture of Cu2O and CuO on heating gives 0.88g of copper. Calculate % of CuO in mixture
28. science
why are cherry blossoms called cherry blossoms
29. science
A mixture of benzenoic acid aniline and phenol is dissolved in chroloform and the solution was treated with sodium hydroxide.hydrochloric acid and sodium bicarbonate.show the separation chart,identify the composition of each phase and explain the chemistry of the separatiob ...
30. Science
A car travel along a straight line for first half time with speed 40km/hrs & second half time with speed 60km/hrs. Find average speed.
31. science
a person moves 30 m north , then 20 m east and finally 30 root 2 south west what is his displacement from the original position
32. science
a boy is going from one place to another he goes 100m north and then 70 m east find the displacement of the boy from his starting point
33. Science
Explain why would the debris fan (mound of deposition) be greener than the surrounding areas? Think of the slide mass versus the surrounding in‐place bedrock in terms of porosity and permeability; how would these parameters differ?).
34. science
Can someone please explain how does the troposphere differ from the stratosphere
35. science
A lab technician adds 0.035 mol of KCl to 1.00 L of 0.0050 M Pb(NO3)2. Ksp = 1.7 × 10–5 for PbCl2. Which of the following statements is correct? a) Lead chloride precipitates until the solution is saturated. b) The solution is unsaturated and no precipitate forms. c) The ...
36. physical science
it takes 100n to pull an object up an inclined plane. the gravitational force on object is 600n whats load force whats effort force
37. Science
What occurs when atoms link together in a new ways to create a substance different from original substances
38. Science
39. Science
Electric charges that are different? 1)attract each other 2)repel each other 3)exist in pairs 4)do not interact I think #1 Thanks
40. science
Which statement most accurately compares Earth’s crust and Earth’s mantle?
41. Environmental Science
When do government agencies have to file and Environmental Impact Statement (EIS)? A) Any time a federal agency proposes a project that will use taxpayer money*** B) Any time a federal agency proposes a project that will cost more than \$1 billion C) Any time a federal agency ...
42. Science
Acceleration due to gravity on planet mercury 3.7m/s.what would the mass of a person weighing 637 n on mercury
43. Science
Which of the following is true about the electric charges on the objects below The ball on the right has a positive charge and the ball on the left has a negative charge The ball on the left has a positive charge and the ball on the right has a negative charge The balls do not...
44. science
The ozone layer is located
45. Science
A cyclist speed up at a constant rate from rest to 8m/s to 6s. Find the acceleration of the cyclist
46. health, science
How can I explain Lung cancer to children? I don't know how to explain in easy words. "Lung cancer is the uncontrolled growth of abnormal cells in the tissues of the lungs. If not treated, lung cancer may spread to the surrounding tissues and other parts of the body."
47. CHECK my answers Physical science
1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of matter has a definite ...
48. Science
In what fields would a lab technician need to separate & identify organic items? I looked it up and it said organic chemistry, forensics.. . I'm not which one because couldn't it range?
49. science
Juggle and bangles are clowns.juggles stands on one end of a teeter-Ritter at rest on the ground.bangles jumps off a platform 2.5m above the ground and lands on the other end of the teeter-totter,launching juggles into the air.juggles rises to a height of 3.3m above the ground...
50. Science
Four equal point charge each of 16microcoulomb are placed on the four corners of a square of side 0.2m.calculate the force on any one of the charge
51. physical science
can mechanical waves travel through any type of medium?
52. Math and science young children
What is the shorthand method for adding quantities with the same amount called?
53. science
mohan travels at 20m/s from home to market and returns at 25m/s find his average velocity for the entire journey
54. science
What is the pH of a 0.05 M solution of potassium hydroxide??
55. science
The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?
56. science
2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...
57. Engineering science
A boat start sailing on Monday 10:00 at harbour A and sails 600km due north. Later it turns east for a further 420km to reach harbour B on Tuesday at 12:00.a)find total displacement from A-B average. b)speed of the trip.c)average velocity
58. Science
Hey! so, I was just wondering if someone could check a few of my answers. 1. during what phase of the moon can a lunar eclipse occur? A. New moon B. First Quarter C. Waxing gibbous D. Full moon* 2. Which of the following is the smallest possible amount of time that can pass ...
59. science
how do layers b and d compare in age? if rock layers between b and d have eroded away,what is the boundary between b and d called
60. Physical Science
What will be the total resistance and current in a parallel circuit with a 15-volt battery and 3 10-ohm resistors?
61. Science
What is global warming? What can people do to reduce global warming?
62. science
2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...
63. Science
How do calculate specific heat and thermal energy?Science is hard in the 8th grade .
64. Language arts
1. One would expect people living in a utopian society to be A. wealthy B. difficult C. idealistic D. impossible 2. Which statement best describes a utopian community? A. People band together to share resources and duties equally. B. Resources are distributes in accordance ...
65. science
Where will the African Plate be in 100 million years?
66. science sound and light!!!
which of the following involves the diffraction of light waves? A.a glass of water acts like a prism, splitting sunlight from a window into a rainbow on the far wall. B.a stained glass window only allows some of the light from the sun into a room. C.light from a hallway ...
67. science
Calculate the energy released when 1 gram of uranium undergoes fission reaction
68. science
the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ...
69. Science - physics
the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ...
70. Science
If I live in Louisiana, what is an ecosystem near me?
1. What is an example of a stable system?
72. SCIENCE CHEMISTRY
Use the atomic weight of carbon and chlorine to determine the theoretical value of the molecular weight of CH3OH Or methanol.( atomic weights (c=12, cl=35.5).
73. SCIENCE CHEMISTRY
Use the atomic weight of carbon and chlorine to determine the theoretical value of the molecular weight of CH3OH Or methanol.( atomic weights (c=12, cl=35.5).
74. Science
AN experiment discovered that a particular material was a poor conductor of electricity. This material would most likely be used as a(n) A. Conductor B. Insulator** C. Switch D. Resistor
75. science
Atoms from area A are most likely to form ionic bonds with atoms from area? A. area a B. area d C.area c D. area b
76. Language Arts
1. One would expect people living in utopian society to be A. wealthy B. difficult C. idealistic D. impossible*** 2. Which statement best describes a utopian community? A. People band together to share resources and duties equally.*** B. Resources are distributed in accordance...
77. Science
An engineer discovered that a TV set was receiving too much voltage to work properly. Which of the following circuit parts should the engineer add to make the TV set work properly? A:switch B:insulater C:resistor D:conductor I think C is the right answer. Thank you
78. Physical science
What type of intermolecular forces exist in each liquid
79. science
which is an example of covalent bond? a.chlorine accepts an electron from calcium b. lons in a bar of pure iron are surrounded by a large number of valence electrons c.sodium gives an electron to chlorine to form a stable bond d.there are less than 16 valence electrons in two ...
80. science
A cannon on wheels (mass = 300 kg) shoots Bo Bo the clown (mass = 60 kg) over the big top. If Bo Bo's speed out of the cannon is 22 m/s, with what speed will the cannon recoil?
81. integrated science
what is soil profile?
82. science
If all of the prairie dogs were removed, how do you think the prairie ecosystem would be affected?
83. science chemical reactions
which option shows a coefficient on the product side in this chemical equation? 3Fe +4H20 -->Fe30 +4H2 A. the 3 in Fe and 4 in H2O B.the 2 in H2O the 3 and 4 in Fe3o4 and the 2 in H2 C.the 4 in H2 D.the 3 in Fe and 4 in H2O and 4 in H2
84. science
what type of reaction is this 2h2o2 (l) -> 2h2o(l)+ o2 (g) a.single replacement reaction. b.decomposition reaction. c.acid-base neutralization reaction. d.no reaction.
85. Science
How many unit cells can be made out of an 18 carat pure 197 g sample of gold ?( FCC structure A = 197 u)?
86. physical science
Which description does the phrase "mechanical advantage" most closely relate to? A. The same amount of work using less force. B. The same amount of power using less work. C. The same amount of work using less power. D. The same amount of power using less pulleys.
87. Science
How many grams of Sodium chloride are in 53.2 g of solution that is 0.50% by mass sodium chloride?
88. Environmental Science
The ash produced when solid waste is incinerated is____________ than the original solid waste. A) less toxic*** B) more toxic C) as toxic D) more recyclable Since the toxins could have been burned away, leaving behind the ash.
89. science
Recall from previous activities in this lesson which era is sometimes referred to as the Age of Mammals. Locate and click on this section of the geologic time scale, and list the other possible names that could have been used to describe this era, and why?
90. Science
Can someone explain the idea of "structure affects function" please? And can you please give me an example?
91. Physical Science
What is the relationship between the temperature of a star and the spectrum of the star?
92. Environmental Science
Which type of solid waste is mostly paper, yard waste, food waste and plastics? municipal*** industrial biodegradable recyclable
93. science
Hi! Please help as soon as possible! This is my science connections academy test that I took but it restarted. I really don't want to do it again! THANK YOU! 1. Box A is hotter than Box B. After the heat is transferred, they become the same temperature. Which of the following ...
94. science
Hi! Please help as soon as possible! This is my science connections academy test that I took but it restarted. I really don't want to do it again! THANK YOU! 1. Box A is hotter than Box B. After the heat is transferred, they become the same temperature. Which of the following ...
95. Science
which of the following building materials come from renewable resources? Clay Glass*** Metal Plastic
96. Science
Carbon dioxide, ethanol, and energy are the products when anaerobic respiration occurs in oxygen*** in the presence of nitrogen in yeast cells in an animal cell
97. Science
It is possible that a raindrop that splashes you may be water from a lake you swam in the week before. True*** False
98. Science
One light bulb in a string of lights goes out. This causes all the other lights in the string to also go out. This is an example of a?? 1) resistor 2)parallel circuit 3)closed circuit 4)series circuit I think #4. Thanks in advance for your help.
99. Science
When the anthers are burst open, they shed a number of . . .
100. Science
What is similarity between meiosis and mitosis.