# Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.

100,421 results, page 61
1. ## physics 1

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational

asked by Anonymous on February 13, 2014
2. ## Physics

The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational

asked by Randy on February 13, 2013
3. ## physics

You are explaining to a friend why the crew of the International Space Station feels weightless while orbiting the Earth. Your friend responds that he thought gravity was just a lot weaker up there. Show that it isn’t so by calculating the acceleration

asked by paige on October 23, 2012

I don't want someone to do this for me-I'm just totally lost and don't even know where to start-I'm totally lost on this one- the earth is surrounded by an electric field with a strenth of 100 N/C at the surface. Its electric properties are the same as a

asked by Rafaela on April 7, 2011
5. ## math

A person leaves her home and walks 330 feet due north, then she walks 640 feet east, then she walks 900 feet north and 370 feet east. How far, to the nearest tenth of a foot, is she from her starting point?

asked by Anonymous on June 9, 2015
6. ## Chemistry

I have a homework question that says: "Three resonance structures of the following anion are possible. One is given below, but it is incomplete. Complete the given structure by adding non-bonding electrons and formal charges. Draw the two remaining

asked by Anne on September 8, 2016
7. ## Chemistry

A gas in a discharge tube consists entirely of ions of the same element, of the same charge. Each ion has only one remaining electron. The voltage between the electrodes of the gas discharge tube is increased from zero. Electrons are accelerated across the

asked by Sam Chem on March 22, 2013
8. ## Physics

An aircraft has a cruising speed of 100 m/s On a particular day, a wind is blowing from the west at 75.0 m/s If the plane is pointed due north, what would be the magnitude and direction of the velocity relative to the ground? If the pilot wishes to have a

asked by Niki on October 16, 2013
9. ## physics

a projectile is ejected from a 25 m high tower with a velocity of 40 m/s at an angle of 30 degrees to the horizontal first on Earth and then on Mars. What is the ratio of the time taken to hit the ground on Mars compared to Earth? (Assume gravity on mars =

asked by kjean on January 27, 2014
10. ## Physics

A proton is released from rest inside a region of constant, uniform electric field E1 pointing due North. 14.8 seconds after it is released, the electric field instantaneously changes to a constant, uniform electric field E2 pointing due South. 8.07

asked by Joe on January 23, 2016
11. ## Chemistry

I am still not understanding how to calculate n in Ecell=Enaughtcell-(.0592/n)logQ. Example: Au/Au^3+ and Cu/Cu^2+ If I am correct it should look like this Au->Au^3+ + 3e- (Enaughtcell = 1.50V) and Cu->Cu^2+ + 2e- (Enaughtcell = 0.34V). The Cu/Cu2+ is the

asked by amy on April 20, 2007
12. ## fortis

north island federal credit union pay 4% annual interest, compounded daily on time savings deposits. find the value after 1 year of 750 deposited in this account

asked by lisa on September 27, 2012
13. ## history

please give me links from which i can find the answer to this question the North Atlantic Treaty Organization (NATO) was based on the principle of a. free trade b. collective security c. appeasement d. isolationism thanks:D

asked by history on March 31, 2009
14. ## essay

Hi i can't find any websites except wikipedia to help me with this question Analyze the impact of the Atlantic trade routes established in the mid 1600's on economic development in the British North American Colonies

asked by nick on July 23, 2008
15. ## Physics

The planet Krypton has a mass of 6.8 × 1023 kg and radius of 2.8 × 106 m. What is the acceleration of an object in free fall near the surface of Krypton? The gravitational constant is 6.6726 × 10−11 N · m2 /kg2 . Answer in units of m/s 2 . A

asked by Purplegirl06 on December 3, 2018
16. ## Physics

Given that the Sun has a mass 333,000 times larger than Earth’s mass and Earth has an average distance of 1.49 x 1011 m from the Sun, at what distance from the Sun is the center of mass of the Earth-Sun system? a. 1.00 m b. 4.47 x 105 m c. zero d.

asked by Tiffany on October 31, 2012
17. ## Physics

A chartered airplane flies 100 km east, then 350 km northwest, and then 150 km at 30° west of south. After an additional displacement, the plane is back where it started. Find the magnitude and the direction of the last leg of the journey.

asked by Spike on January 21, 2013
18. ## physics

a woman who weighs 150 lb. on earth would weigh 340 lb. on another planet, what is her mass on earth, what is her mass on the other planet, what is the magnitude of the gravitational field on the other planet

19. ## English Writing

Please help me... People believe in God because... And there is life on earth because... And people who believe in God think that God has put human beings on this earth because... I have to write continue of these sentences... Could you guys help me

asked by CC on September 4, 2016
20. ## help

In “who knows if the moon’s,” the speaker imagines traveling somewhere. Where does he imagine traveling? to Earth from the moon to a nearby garden to the moon from Earth to a city in the sky thx

asked by alicia on February 21, 2018

All of the following statements concerning crystal field theory are true EXCEPT a. in low-spin complexes, electrons are concentrated in the dxy, dyz, and dxz orbitals. b. in an isolated atom or ion, the five d orbitals have identical energy. c. low-spin

asked by Anonymous on May 6, 2014
22. ## Math - Working with Logs!!

On September 26 2001, an earthquake in North Bay measured 5.0 on the Ritcher scale. What is the magnitude of an earthquake 3 times as intense as North Bay's earthquake? I would post my answer, but in text, it's just confusing and I can't post picture links

asked by Anonymous on December 11, 2007
23. ## Physics

A light plane attains an airspeed of 491 km/h. The pilot sets out for a destination 785 km due north but discovers that the plane must be headed 20.5° east of due north to fly there directly. The plane arrives in 2.25 h. What was the magnitude of the wind

asked by Nicole on January 26, 2013
24. ## Physics

A person walks 24.0° north of east for 2.80 km. How far would another person walk due north and due east to arrive at the same location?

asked by Kate on March 9, 2010
25. ## math

a bird flies due north 2 miles then east 3 miles then north 4 miles then east 5 miles how far is the nest from the ocean

asked by mary on October 4, 2011
26. ## Math (Calculus)

At 2:00 pm boat K is 25 km north of boat L. If boat K is sailing 5 km/h west and boat L is sailing north at 20 km/h, what is the rate at which the distance between the two boats in changing at 2:30?

asked by Steven on November 4, 2012
27. ## physics

A person walks 41° north of east for 3.77 km. How far would another person walk due north and due east to arrive at the same location?

asked by John on September 22, 2011
28. ## physics

A person walks 25.0° north of east for 4.00 km. How far would the person walk due north and due east to arrive at the same location?

asked by asher on September 20, 2009
29. ## Physics-Momentum

A Toyota of mass 1500 kg is driving at 15 m/s North when it rear-ends a Cadillac of mass 2500 kg also moving North at 9 m/s. (The driver of the Toyota was probably texting) After the collision, the Toyota bounces back at 2 m/s. What is the speed of the

asked by Mike Smith on January 26, 2017
30. ## Physical Science

My homework is to do some exercises on the Foucault Pendulum. I'm stuck on several of the problems. One is to find the approximate angle of rotation of the earth in one day at our latititue, which is 39.9. I found the equation n = 360 sin of latitude, but

asked by Beth on September 23, 2007
31. ## Physical Science

When U238 decays into Pb206 via alpha and beta decay, what are the byproducts of the decay? A. 8 alpha particles and 6 beta rays. B. 8 alpha particles, 6 electrons, 6 neutrinos, and energy C. 16 alpha particles, 16 beta rays, and energy D. 16 deuterons and

asked by Anonymous on October 27, 2011
32. ## Math

If an object which weighs 100 lbs on the Earth's surface were placed on a planet with 2 times the radius of the Earth and with 7 times the Earth's mass, how much would that object weigh? Enter answer to nearest 0.1 lbs. The term "void ratio" means the

asked by james bond on January 28, 2017
33. ## mechanics and heat

At the same instant that a 0.5 kg ball is dropped from 25 m above earth , a second ball , with a mass of 0.25 kg , is thrown straight upward from earth’s surface with an initial speed of 15 m/s . They move along nearby lines and pass without colliding.

asked by awash on January 7, 2015
34. ## socialstdies

What did the Union Army gain as a result of the Battle of Vicksburg? (1 point) The Union Army captured thousands of prisoners of war. The Union Army used Southern slaves as fresh recruits. The Union Army gained control of the Mississippi River. The Union

asked by XenaGonzalez on January 24, 2015
35. ## chemistry

how many electrons does se-2 have 32 34 36 2

asked by kaiya on October 11, 2010
36. ## chemistry

how many electrons can n=4 l=1 have?

asked by Alex on April 8, 2015
37. ## calculus

Find the resultant vector. 1) A force of 35 grams and 45 grams applied at right angles. 57.009 g at 52° with respect to the 35 kg force 2) Velocities of 400 mph due north and 500 mph due east. 640.31 mph at 51° with respect to the 400 mph force 3)

asked by sasha on October 5, 2015
38. ## HISTORY

What led North Korea to become a Communist country? It was the Korean Revolution’s overthrow of the Republic of Korea. It was the invasion and occupation of North Korea by the Soviet Union during World War II. It was the puppet government of Puyi

asked by Anonymous on August 16, 2018
39. ## Physics

You take a trip in your car. Starting from rest, you accelerate at 1.00 m/s2 for 10.0 s, heading north. You then stop accelerating and immediately head west at a constant speed for an additional 20.0 s, at which point, you crash into a building coming to

asked by sarah on April 10, 2016
40. ## economic

Write an essay based on this topi -The south african government is not providing enough welfare or subsidies to the poor and underprivileged bassed on the following topic 1.what are welfare and consumer subsidies 2. What is the south african government

asked by muano on May 12, 2016
41. ## physics

(a) What is the direction of the force on a wire carrying a current due east in a location where the Earth’s field is due north? Both are parallel to the ground. Answer: Direction of force is Vertically up from ground (b) Calculate the force per meter if

asked by anonymous on October 2, 2014
42. ## science/astronomy

4. Which of the following is a common feature among the four inner planets? (1 point) atmosphere composition distance from the sun rocky surfaces**** temperature range 5. Which of the following is the smallest terrestrial planet? (1 point) Mars Mercury**

asked by reb on October 31, 2018
43. ## chem

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to

asked by marie on January 24, 2011
44. ## Language

Does anyone know the answer too, Lesson 7: Third Read: I am A Native of North America Quiz, I would like to check my answer, I would also like help on question three; In "I am A Native Of North America," Chief George expresses his view of community. In a

45. ## Physics

An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 4.9 km, but when the snow clears, he discovers that he

asked by Patricia on January 29, 2013
46. ## Physics

A woman using a compass and a map walks 132 degrees east of north for 6 km. Find the components of the woman's displacement. A. Ax = 4.46 km, Ay = 4.01 km B. Ax = 0.74 km, Ay = -0.67 C. Ax = 4.46 km, Ay = -4.01 km D. Ax = 0.74 km, Ay = 0.67 km (I'm new to

asked by Sasha B. on September 30, 2018
47. ## science

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

48. ## physics

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

49. ## trigonometry

A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.

asked by John on January 5, 2013
50. ## Physics

A body which has three forces acting on it is in equilibrium. One force is 3N to the North, and another is 4N to the west. Find the magnitude and the direction of the third force. Show the vector diagram.

asked by Moyamé on July 20, 2014
51. ## trigonometry

A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.

asked by John on January 5, 2013
52. ## trigonometry

A ship at A is to sail to C, 56km north and 258km east of A. After sailing N25°10’E for 120mi to P, the ship is headed toward C. Find the distance of P from C and the required course to mean C.

asked by anonymous on January 10, 2013
53. ## Physics

Use scale drawing method: If a man travels 7km 30degree east of north,then 1okm east,find the resultant displacement

asked by Johnson on September 23, 2018
54. ## physics

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

55. ## Another astronomy (algebra-based physics) question

I’d prefer thorough solutions, but if you can only provide formulas that would solve each part of the problem, that’d be helpful too :-) Thanks! Spinning too fast The rate of rotation of astrophysical objects that are held together by gravity (e.g.,

asked by Mark on March 4, 2009
56. ## physic

A jetliner travels with a constant speed of 597.4 km/h relative to the air to a city 780.1 km due south. (a) What is the time interval required to complete the trip if the jetliner is experiencing a headwind of 41.1 km/h toward the north? h (b) What is the

asked by joy on January 31, 2018
57. ## CHEM Periodic Trends

Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false. Within a family, elements with higher atomic numbers have higher

asked by Stacey on November 1, 2012
58. ## math

This is the problem given: The side of a hill faces due south and is inclined to the horizontal at an angle alpha. A straight railway upon it is inclined at an angle beta to the horizontal. If the bearing of the railway is gamma east of north, show that

asked by Jessica on July 5, 2011
59. ## Science

Which of these statements are true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on the Earth than there was millions of years ago.(MY ANSWER) C. There is no way to tell how much water there was on Earth

asked by Millicent on January 19, 2017
60. ## Science

Which of the following statements is true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on Earth now than there was millions of years ago. C. There is no way to tell how much water was on Earth millions

asked by Katy on April 19, 2015
61. ## science

A person is travelling in the east direction with a speed of 2 km/hr with respect to the ground. he finds that the wind seems to blow from north. When he doubles his speed, the wind appears to come from north-east direction. determine the velocity of wind.

asked by natasha on September 27, 2016
62. ## Maths Exponents

(1) 11×10^-5 .Express it in scientific notation. (2)The distance between sun☉ and earth🌎 is (1.496×10^11)m and the distance between earth 🌎 and moon 🌙 is (3.84×10^8)m.During solar eclipse moon comes in between earth and sun.At that time what

asked by Vivek on September 17, 2016
63. ## Social Studies

Which statement best describes how slavery was presented in Uncle Tom's Cabin? a. slavery was presented as a political problem for Congress to solve b. slavery was presented as an economical requirement for the South c. slavery was presented as a moral

asked by Kato on January 13, 2017
64. ## History

Explain how attacks by abolitionists strengthened sectionalism in the south. Provide Support. All I need is the main idea. If you could just provide a sentence or two about this, or just help me find what I'm looking for by linking an article or something,

asked by ? on February 9, 2016
65. ## English 12

how could i make these two sentences better. In the south pacific mountaintops there is vast number of forests. Hunters from this mountaintop civilization find it extremely difficult to hunt with the burden of the forests.

asked by Pria on February 8, 2012
66. ## US History

ALL of the following statements are correct about the slave trade EXCEPT: a. It began with the Portuguese exploration of West Africa from Senegal to Angola in the fifteenth century b. It increased when the Portuguese built several fortified outposts along

asked by Anonymous on November 17, 2016
67. ## math chem

Global warming refers to the rise in average global temperature due to the increased concentration of certain gases, called greenhouse gases, in our atmosphere. Earth¡¯s oceans, because of their high heat capacity, can absorb heat and therefore act to

asked by Anonymous on January 24, 2011

A 40m deep well with radius 3.5m is dug & the earth taken out is evenly spead to from a platform of dimension 28m by 22m.find the heght of the platfoem?

asked by fira on May 22, 2016
69. ## earth science

If the tilt of Earth’s axis were 10◦ , where would we find the Arctic and Antarctic Circles (what latitudes)? Would this cause a change in the dates of the solstices, equinoxes, and perihelion and aphelion?

asked by frank Minimi on April 14, 2009
70. ## chem

1. The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking the Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles. How much of Earth’s

asked by tra on May 14, 2013
71. ## history

Which most accurately reflects the development of agriculture in early African civilizations?  the walls of the jabrin castle were erected in oman to protect valuable crops the kingdom of Ghana exchanged surplus crops and gold for textiles and salt

asked by Kira on September 29, 2017
72. ## Calculus

1.At noon of a certain day,ship A is ^0 km due north of ship B. If A sails east at 12 km/hr and B sails north 9 km/hr,determine how rapidly the distance between them is changing 2 hrs later. Is it increasing or decreasing? 2.At a given instant the legs of

asked by 123 on August 31, 2014
73. ## Physics Problem 6.20

The center of a 1.40 km diameter spherical pocket of oil is 1.50 km beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of g for a uniform Earth? Assume the density of oil is

asked by Michael Moskvich on April 4, 2010

The Moon has a diameter of about 3480 km and an orbital radius of about 384 400 km from the centre of Earth. Suppose that the Moon is directly overhead. What is the measure of the angle subtended by the diameter to the Moon as measured by an astronomer on

asked by Anonymous on October 26, 2009
75. ## physics

About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5x10^7 kg meteor fell and struck Earth, leaving a 180 m hole now known as Barrington crater. If the meteor was traveling 20000 m/s upon impact, with what average force did the

asked by Eric on March 3, 2011
76. ## Astronomy - help!

The earliest fossil records indicate that life appeared on Earth about a billion years after the formation of the solar system. What is the most mass that a star could have in order that its life-time on the main-sequence is long enough to permit life to

asked by anonymous on October 29, 2008
77. ## Physics

Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

asked by Fiona on September 14, 2012
78. ## Physics

Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

asked by Fiona on September 14, 2012
79. ## physics

Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm.

asked by Anonymous on November 27, 2013
80. ## Science

How sediments,fossil, and ice core record Earth's geologic history? It record Earth's geologic history by giving scientist an idea of when certain climates or events happen.(Is this a good answer?) Thanks

81. ## physic

Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm.

asked by mert on July 11, 2013
82. ## Earth Science

Why is it generally warmer in a rural area than in an urban area? I have a question: How does the earth's surface heat up or cool down? My answer: the sun heats up the earth darker surfaces are warmer than cooler surfaces. Please help.

asked by Lori on December 19, 2007
83. ## physics

If you weigh 650 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 15.0 km ? Take the mass of the sun to be ms = 1.99×10^30 kg, the gravitational constant to be G =

asked by Kristina on March 29, 2012
84. ## Physics

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 64 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer

asked by Sally H on July 2, 2014
85. ## Physics

the temperature at the surface of the sun is approximatly at 5700K and the temperature at the surface of the earth is approxiamtly 290 K. what entropy change occurs when 1100 J of energy is transfered by radiation from the sun to the earth?

asked by jenn on February 2, 2010
86. ## earth

The quantity of radiation received by earth from the sun is 1.4 kW / m2. Assuming that sun is an ideal radiator, calculate the surface temperature of the sun. The ratio of the radius of earth's orbit to the radius of the sun is 216.

asked by kamal on June 27, 2012
87. ## PHYSICS

This is the exact problem from the paper and I got an answer of 4.2 * 10^7 and I was wondering if this was the right answer. What is the height above the earth's surface at which all synchronous satellites (regardless of mass) must be placed in orbit? The

asked by NIQUEFROMDALLAS on October 26, 2008
88. ## Physics

The acceleration due to gravity on the moon is about one sixth its value on earth. If a baseball reaches a height of 62 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer

asked by Joe on September 17, 2011
89. ## Physics

The surface of the Sun is approximately 5,650 K, and the temperature of the Earth's surface is approximately 295 K. What entropy change occurs when 6,000 J of energy is transferred by heat from the Sun to the Earth? ______J/K

asked by Sally on November 26, 2012
90. ## physics

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 78 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer

asked by isaiah on September 20, 2014
91. ## physics

A. how long will it take for a 55.0 kg steel brick to fall 75 meters on earth. A. how far from the base will a 55.o kg steel brick to land,(horizontally) if it dropped a vertical distance of 75 meters on earth, and what is its velocity just before it hits

asked by grace on December 15, 2016
92. ## Physics

A 8.6-kg rock and a 5.9 × 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth. (b) Calculate the magnitude of the acceleration of each object when released. For b),

asked by A.S on February 6, 2018
93. ## Physics

The location of a car at times t1 and t2 is given by the position vectors r1= 15km due east + 20km due north (time t1) and r2= 13km due west + 25km due north (time t2) The units of distance are kilometers a. What is the magnitude l^rl of the displacement?

asked by Johana on October 3, 2011
94. ## As Physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge Two copper wires of diameter 1 mm and 2

asked by cylinder on January 4, 2018
95. ## physics

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density

asked by Joe on July 6, 2016
96. ## astronomy

1. The radius of the Sun is 7 X 10^5 kilometers. Use powers of ten to show that the Sun's radius is about 100 times the Earth's radius. 2. Given that an astronomical unit is 1.5 X 10^8 kilometers and a light-year is about 10^13 kilometers, how many AU are

asked by John on April 3, 2007
97. ## physics

A 470-kg satellite experiences a gravitational force of 850 N. Use M_{Earth} = 5.972 x 10^{24} kilograms and r_{Earth} = 6370 kilometers What is the radius of the satellite�s orbit? r_{orbit} = _____________kilometers What is its altitude? altitude =

asked by Melissa on March 3, 2014
98. ## SCIENCE

Suppose an astronomer oberserves a huge solar flare. Predict its effect on Earth in the next day or so. I put it would break satellites and powercuts would happen. But would a huge solar flare kill all people on Earth? Im not sure

asked by Mika on November 21, 2011
99. ## physics

A 4.92E+2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.81E+4 J of work on the balloon in the process. At what height above the surface of the earth does the

asked by Fallon on May 9, 2010
100. ## phys sci

the space shuttle orbits at an altitude of approximately 200 km above the surface of the earth. If the radius of the earth itself is 6380km, what is the acceleration due to gravity at the altitude ofthe space shuttle?

asked by king on July 19, 2011