# Science

1. physical science
. The maximum allowable resistance for an underwater cable is one hundredth of an ohm per metre. If the resistivity of cooper is 1.54 × 〖10〗^(-8) Ω m, find the least diameter of a copper cable that could be used (show work)
2. physical science
What length of German silver wire, diameter 0.050 cm, is needed to make a 28 Ωresistor, if the resistivity of German silver is 2.2 × 〖10〗^(-7) Ω m (show work)
3. physical science
The resistance of the ohm is very approximately that of a column of mercury 1.06 m long and of uniform cross-section of one hundred of a cm^2. Find the resistivity of mercury.(show work)
4. physical science
Taking the resistivity of platinoid as 3.3 × 〖10〗^(-7) Ω m, find the resistance of 7.0 of platinoid wire of average diameter 0.14 cm.
5. physical science
The heating elements of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is 220 cm long and ...
6. pyhsical science
A wire of uniform cross-section has a resistance of R Ω. What would be the resistance of a similar wire, made of the same material, but twice as long and of twice the diameter?
7. Science
A silver picture frame has a volume of 5.97 cubic centimeters and a mass of 59.7 grams
8. LIFE SCIENCE
WHY IS A SPOROPHYTE CALLED A SEMI-PARASITE
9. science
compute the average velocity in the following two cases: you walk 73.2m at a speed of 1.22m/s and then run 73.2m at a speed of 2.80m/s
10. Political Science
Should the same impeachment process and standards be used for judges, justices, and presidents? Are the same process and standards used?
11. Science
During what phase of the moon can a lunar eclipse Occur
12. Science
which one occurs more often lunar eclipse or solar eclipse? this is just a question i'v been thinking of
13. Science
The words to use are: crust, moving, lithosphere, asthenosphere, upper mantle, volcanoes, semisolid The ___1___, which includes the ___2___ and part of the ___3___, is divided into plates that carry all of Earth's lands and oceans. These plates float on a ___4___ layer of rock...
14. SCIENCE (Connexus)
how could tree rings from Bristlecone Pines support the theory that some areas have had periods of drought and flooding for hundreds of years?
15. science
It is new and old at the same time
16. SCIENCE HELP
a bristlecone pine in the white house usually adds a new ring when which of the following occurs? a. earths daily rotation is complete b. the full moon causes a monthly high tide c. the new moon is visible from earths surface d. earths northern hemisphere is titled toward the ...
17. Science
What does the Hertzsprung-Russell Diagram NOT plot? A. temperature and mass B. spectral class and absolute magnitude C. absolute magnitude and luminosity D. spectral class and temperature Is it B?
18. Science and Hurry!
The Gulf Stream current shown here makes the waters of the North Atlantic A) warmer. B) cooler. C) more dense. D) less nutrient rich.
19. Earth Science
Slide 1 This is a cumulus cloud. Can you find four things on the word list that you can use to describe this cloud. Cumulus clouds consists of puffy tops, no rain expected, 3,000 ft. high, and flat bottoms. Slide 2 This is an example of towering cumulus clouds. Write down as ...
20. Science and Hurry!
How do ocean currents influence the climate of a place? A) They transport heat over large distances, affecting the wind that blows over the land. B) They bring cold water from the poles, reducing the temperatures along the coasts. C) They draw out moisture from the wind, ...
21. Science and Hurry!
What causes land breeze and sea breeze? A) The differential heating of land and sea by the Sun results in the movement of air. B) Hot air from the sea blows over the land because there is a high pressure area over the sea. C) Cold air blows from the land over the sea because ...
22. science
What can people do to reduce global warming?
23. science
10. Which of the following is an effect of global warming? A) increased drought B) falling sea levels C) decreased coastal flooding D) glacier spreading
24. science
what causes clouds to form?
25. science
weather maps use isobar lines to show weather conditions. what is indicated by this?
26. SCIENCE
CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?
27. physical science
A 15kg piece of mass suspended from a hook in the ceiling is pulled aside by a horizontal string until the supporting string makes an angle of 30 with the vertical .draw a vector diagram showing all the force acting on the piece of mass
1. How does sea-floor spreading occur? a.New materials are being added to the atmosphere. b. Earthquakes break apart the ocean floor. c. Sediments accumulate at the area of spreading. d. Molten material beneath Earth's crust rises to the surface. 2. Which feature form the ...
29. Science
Heat and pressure deep beneath the Earths surface can change any rock into A) chemical rock B) gemstone C) metamorphic rock D) sedimentary rock
30. Science, Health
Are calories the only difference between eating 100g of chips and skittles vs. eating 100 g of fresh fruit? What are some other things that you think should be considered?
31. Social studies
Why the scientific method is better than Aristotelian science and divine Biblical knowledge..? about Galileo on Trial
32. science
what is the humidity level of the dew point?
33. science
what happens to air temperature as altitude increases?
34. science
What the lines making a circle around the high-pressure area indicate. please sombody help
35. science
if there is a low pressure area developing over warm water, what type of storm is most likely to form?
36. science
Compare lunar and solar eclipses and answer the following questions: How does a solar eclipse happen? How does a lunar eclipse happen? Which one occurs more often?
37. Science
When the North Pole is tilted toward the Sun, which hemisphere will have the summer season? Northern Hemisphere - June
38. science
Which of the following is a reason to use parallel sentence structures in a literary analysis essay?
39. Science
Lead(ll) Iodide can be produced from the reaction of Lead(ll) nitrate and potassium Iodide.What mass of lead(ll) iodide is produced when 50.0 mL of each solution is combined,forming a 0.750 M Solution of potassium nitrate? Please help me to solve this problem thank you
40. Science
An insect of mass 20g crawls from the centre to the outside edge of a rotating disc of mass 200g & radius 20cm. The disc was initially rotating at 22.0 rad/s. What will be it's final angular velocity? What is the kinetic energy in the system?
41. Science
A truck of mass 2000kg moving on a highway experiences an average frictional force of 800N. If it's speed increases from 25m/s to 35m/s over a distance of 500m what is the force generated by the truck .
42. Science
A bullet of mass 20g, travelling at a speed of 350m/s, strikes a steel plate at an angle of 30° with the plane of the plate. It ricochet off at the same angle at a speed of 320m/s. What is the magnitude of the impulse that the steel plate given to the projectile? If the ...
43. Science
A box of mass 50kg is placed on an inclined plane. When the angle of the plane is increased to 30°, the box begins to slide downward. Calculate the coefficient of statics friction b/w the plane and box . Draw the free body diagram .
44. Science(chemistry)
Some students believe that teachers are full of hot air. If I inhale 2.2 litres of gas at a temperature of 18 degree Celsius and it heats to a temperature of 38 degree Celsius in my lungs,what is the new volume of the gas?
45. science
determine the number of grams of NH4CL that will dissolve in 100 grams of water at 25 Celcius.
46. Science
What is a cation?
47. Science
what are the similarities between thermal energy and electrical energy
48. Physical Science
A delivery man pushes the button to ring the doorbell. Which of the following forms of energy is not involved in this process? electrical sound mechanical gravitational my answer is gravitational
49. Science
describe what happens, at the molecular level, during melting.
50. science
calculate the maximum height?calculate how long ? land on the ground?
51. Science 6
Renny noticed that after oiling his skateboard wheels, it was easier to reach the speeds he needed to perform tricks. How did the oil help? A:The oil reduced friction between the moving parts of the skateboard. B:the oil increased the friction between the moving parts of the ...
52. Science
A 60-kg cheetah reaches a speed of 30m\s as it chases its prey. What is the kenetic energy of the cheetah?
53. Physical Science
An elephant drags a tree trunk along a rough horizontal surface by means of an attached rope which makes an angle of 30° with the horizontal. The force in the rope is 4 000N. CALCULATE the horizontal component of the force exerted by the rope on the tree trunk
54. Science
How many grams of ammonium nitrate nedd to be added to 500g of water so that the freezing point becomes -8.3 °C?
55. Physical Science
Like water, hydrogen fluoride, HF, and ammonia, NH3, have relatively high boiling points. Explain. A.The polar molecules of each of these materials have relatively strong attractions for themselves, which translates to relatively high boiling points. B. Since these molecules ...
56. Physical Science
If an element has a +1 positive charge and the following chemical symbol, how many electrons does it have? 17 on top, 6 on bottom, Oxygen (O) A. 7 B. 17 C. 5 D. 18
57. Physical Science
Why is metal shiny? A. The electrons absorb each light wave. B. The loose electrons reflect most wavelengths of light. C. The electrons emit light due to electronic excitation. D. The electrons transmit most wavelengths of light. (I think the answer is B, but I am not positive)
58. Science
Plants use nutrients that_______ adds to soil. 1.bedrock 2.sand 3.loom 4.humus I think it's humus.
59. Science!
What changes would a cold front bring to a warm, dry area? A)extended period of rain B)several gray skies C)dry and asunny skies D)rain or thunderstorms I think it is either a or d but I am leaning more to a, so please help!
60. science
a body moving with an inertia velocity of 30m/s accelerate uniformly at a rate of 10m/s until it attends a velocity of 50m/s.what is the distance covered during this period?
61. Science/Weather
Satellite images help meteorologists in all the following ways except: a) monitoring changes in the strength of storms b) locating areas of high and low pressure systems. c) predicting rainfall amounts d) recording daily high and low temperatures. I think the answer is c or d...
62. science
What is the percent mass of calcium in a calcium supplement if 1.28-g of calcium carbonate is extracted from a 2.72-g pill?
63. science
A body starts from rest, the ratio of distances travelled by the body during 3rd and 4th seconds is -
64. Science
A pool ball leaves a 0.6 m high table with an initial horizontal velocity of 2.4 m.s.calculate horizontal and vertical velocity and time taken for the pool ball to fall to the ground
65. Science
To what temperature must a given mass of Nitrogen at zero degree celsius be heated to double its volume and pressure?
66. science
Jane can still pump air in the party balloon even through it is already inflated.What explains this phenomenon?
67. Science
1) How does the pH of a solution affect its solubility and structure of weak organic acids and bases, such as proteins and nucleic acids? 2) Why would a zipper or a Velcro strip be a good analogy to weak interactions between biological molecules? Thank you!
68. science
why did scientists think that proteins were the genetic material and not nucleic acids?
69. Science
What is the molar concentration of water in a solution of 10mM glucose? What types of ions are formed when water dissociates at room temp? Thank you!
70. Political Science
What are some pros and cons to privatizing the U.S Postal Service?
71. Science
How does a non metal behave chemically? Gimme an example
72. Math
Suppose 3 student change their vote from math to science describe how the frequency gable would change
73. math (Ms. Sue plz help)
Plz help my dad dose have time for me my mom die when i was a little girl plz do help me and i am not lieing a 4x4 grid with 5 blocks shaded (1 point) one over five, 25% *** five sixteenths, 31.25% one over four, 20% one over four, 25% 2. Model 32% on a 5 × 5 grid. (1 point) ...
74. Science
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. A.)True B.)False** 2. Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure ...
75. Honors Physical science
Lesson 13 force and motion unit test. I need 1-62
76. Science
How much work is done in moving a 25lb. load a distance of 7 feet?
77. Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe's weight on the moon is 124 N. What will Joe's mass on Earth be?
78. Science
A box weighing 20lb. is being pushed up an incline. If the angle of incline was 90° to the ground, what effort would be needed to push the mass? I don't get how to get the effort if an angle was in the problem.
79. Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe weighs 7633 N on earth. What will Joe's mass on the moon be?
80. Science
although electromagnetic waves differ in the wavelengths they all travel at the speed of light which is A.300,00km/s B.6000km/h c.100km/s d.10,00km/s A rocket is a motor that can urn fuel without requiring A.water B.air c.electricity d.fire
81. Science
Teachers need a better way to give feedback to students. Writing on everyone's paper takes a lot of time,even though it is effective. Students and teachers need a better way.
82. Science
Five criteria for decision making matrix "teachers need a better way to give feedback to students."
83. Science
When sodiun is placed in water,it reacts violent to produce hydrogen gas and form sodium hydroxide solution. write a balanced chemical equation for this reaction
84. Science
Why the bulb glows when the electric current passes through it?
85. science
does condensation or evaporation occur on a cold can of juice is put on the table on a hot day
86. Science
Which of the following forces causes a feather to fall slower then a bowling ball? A.gravity B.rolling friction C.sliding friction D.air resistance
Must new substances be formed when you observe a chemical property? My answer is no because you are just observing. There is no reaction taking place. I don't know if my answer is correct.
88. Science
Must new substances be formed when you observe a chemical property?Explain.
89. Science
What effect does observing a substance's physical properties have on the substance?
90. Science
Why do automobiles rust more easily in wet climates than dry climates?
91. Science
If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain.
92. Science
If one sound registers one decibel more than another, then it is ____ times as intense? Round your answer to three decimal places.
93. science
The Sun is unusual because it does not belong to a ____ ? A) solar system B) universe C) galaxy D) binary star system I think the answer is D but I'm not 100% positive.
94. Social Studies nhf
Thank you! BTW, nhf stands for need help fast :) thank you again in advance!! All right! So, I have a few essay questions I want to make sure are right! This is really important to me and I am not that good in science. Please help me!! Here goes everything! (6 points) 1. ...
95. Science
The African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. How will this area change in 100 million years? In your answer, consider how continents will change and how the Mediterranean Sea will change. I was trying to click on your link but ...
96. Science
The African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. How will this area change in 100 million years? In your answer, consider how continents will change and how the Mediterranean Sea will change.
97. Science
A geologists working in a national park finds a mineral he is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe how the geologists can use these items to determine some of the minerals characteristics.
98. Science
Which of earth's spheres contains mountains,valley's, and other landscapes?
99. science
Tom is marking the locations of active volcanoes on a world map. Explain how the locations of the volcanoes are related to Earths plates. can you please explain this to me, I don't understand....thx
100. SCIENCE asap :P
Twice a year on Earth, the number of hours of darkness is equal to the number of hours of sunlight. These events, where both day and night are 12 hours, are the spring and autumn equinoxes.Which of these describes the orientation of the sun and Earth on these two days? A.Earth...