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July 29, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics help
A car travels in a circle whose radius is 31 m, with a speed of 19 m/s. (1) What is the magnitude of the car's acceleration? _____ m/s2 (2) What is the nature (origin) of the horizontal force on the car? (What is exerting the force?) The force causing the car to turn is: ...
Sunday, October 28, 2012 at 10:57pm

Physics
The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
Sunday, October 28, 2012 at 1:12pm

Science
Fill in the blanks: 1. Minerals are classified in many ways, including hardness, streak, and _______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; ...
Saturday, October 27, 2012 at 5:35pm

Physics
What would the weight of an object that is 4N on the earth be on the moon (acceleration due to gravity on the moon is 1.62m/s2?
Thursday, October 25, 2012 at 9:23pm

Physics
If the moon were twice as massive, would the attractive force of Earth on the moon be twice as large? Yes No What about the attractive force of the moon on Earth? Yes No
Thursday, October 25, 2012 at 5:13pm

Physics
In what way does gravity change with distance from Earth?
Thursday, October 25, 2012 at 5:12pm

Physics
Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 75 kg, who is 0.5 m from the baby. N Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from ...
Thursday, October 25, 2012 at 5:12pm

Physics
A pendulum consists of a 2.6 kg stone swinging on a 4.5 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 53 ¢ª to the vertical? (b) What is the greatest angle with the vertical ...
Thursday, October 25, 2012 at 3:15pm

Math
Let d(t) be the shortest distance between Earth and the nearest other planet as a function of time t (where t is in years and t = 0 is noon on January 1, 1000 A.D., say). Is d continuous? Why or why not?
Wednesday, October 24, 2012 at 11:27pm

Science
Fill in the blanks 1. Minerals are classified in many ways, including hardness, streak, and ______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; the...
Wednesday, October 24, 2012 at 10:41pm

scientist
how could measuring the orbit of a comet help scientists understand when it will next be visible on Earth?
Wednesday, October 24, 2012 at 7:11pm

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:34am

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:17am

Math
ilorin is at 8.5 degree to the north,4.6 degree to the east and free town at 8.5degree to the north,13.3degree to the west calculate(a)their distance apart,measured along the parallel of latitude(b)their distance from the equqtor(c)their speed in km/h due to the rotation of ...
Wednesday, October 24, 2012 at 1:12am

Math
the speed of a point A due to the rotation of the earth is twice that point of B.if A is on latitud 22 degree to the north calculate the latitude of B
Wednesday, October 24, 2012 at 12:59am

Physics
How do I find the instantaneous acceleration of the earth orbiting the sun? Everything I am trying is incorrect. I am using 1 second as my time and get 1.99E-7 rads/second. First I tried: acceleration = theta x t / radius Where: theta = 1.99E-7 rads radius = 6.371E6 Then I ...
Tuesday, October 23, 2012 at 11:35pm

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 due to gravity 350 ...
Tuesday, October 23, 2012 at 10:45pm

Physics
An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?
Tuesday, October 23, 2012 at 6:15pm

Physics
Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 m. The moon takes 12 Earth days to ...
Tuesday, October 23, 2012 at 6:14pm

Physics
The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 10 Earth years. a) What is the asteroid's orbital radius? b)What is the asteroid's orbital speed?
Tuesday, October 23, 2012 at 6:12pm

Math
Earth has a new surface of 1.97x10^8 square miles. A new planet has a surface area 13 times the surface area of Earth. What is the surface area of the new planet? Do I multiply 1.97x13 or do I multiply 13x10^8? that's what i'm confused about.
Tuesday, October 23, 2012 at 5:56pm

science
These are the 3 questions that will help me study for my test. i need help understanding each of these thankyou :) Distinguish between microevolution and macroevolution. Explain how forest organisms (producers and consumers) separated by a highway could evolve into different ...
Monday, October 22, 2012 at 9:28pm

Physics help PLZ!!
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North ...
Monday, October 22, 2012 at 5:50pm

Physics
Compute the angular momentum of the earth arising from the following motions. (a) Earth's orbital motion around the sun. (b) Earth's rotation on its axis.
Monday, October 22, 2012 at 4:03pm

geography
1. What is the name of the third largest ocean in the world? The Indian Ocean 2. What is the capital of the People's Democratic Republic of Yemen? Aden 3. What is the equator? The imaginary line that stretches around the Earth separating the Northern and Southern ...
Sunday, October 21, 2012 at 10:41pm

Physics
A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s and accidentally drops a bomb (fortunately not armed) at an elevation of 350 m. You can ignore air resistance. Find the horizontal and vertical components of its velocity just before it ...
Sunday, October 21, 2012 at 9:20pm

Geometry
Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000 square miles. Assume ...
Sunday, October 21, 2012 at 6:48pm

Math
Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
Sunday, October 21, 2012 at 5:22pm

Math
Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
Sunday, October 21, 2012 at 4:52pm

Physics
The gravitational field strenght on the moon is 1.63N/kg. If a rock on the moon weights 2000N, how much does the same rock weigh on the earth?
Sunday, October 21, 2012 at 1:19pm

Physics
On earth, two parts of a space probe weigh 18300 N and 4440 N. These parts are separated by a center-to-center distance of 5.11 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far...
Friday, October 19, 2012 at 5:00pm

reading
According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Friday, October 19, 2012 at 7:17am

Physics
Calculate a space shuttle territory 250 km above Earth's surface. Earth's mass is 6.0 * 10^24kg and its radius is 6.38 * 10^6 m (6380km)
Thursday, October 18, 2012 at 12:57pm

math
John has traveled from a distant planet to spend one earth year visiting with us. However, one year on earth is not the same as one year on john's planet. on john's planet: 10 seconds = 1 minute 10 minutes = 1 hour 10 hours = 1 day 10 days = 1 week 10 weeks = 1 month ...
Thursday, October 18, 2012 at 11:23am

Mathbio in 12th science
2)a stone of mass 1kg tied to one end of a string of length 1m whirld in a horizontal circle with a costant speed 2 radian/second tension of the string is. A)0.5n b)1n c)2n d)4n 3)the orbital velocity of a satelight close to the earth is v then the orbital velocity at a height...
Thursday, October 18, 2012 at 12:51am

7th grade science
1. Venus's surface temperature is ____ than Earth's surface temperature. cooler much cooler hotter none of these isn't the answer hotter because Venus has a denser atmosphere, so the temperature would be higher?
Wednesday, October 17, 2012 at 11:28pm

7th grade science help the solar system Ms. Sue
1. Most likely, ____ were formed when lava from the moon's interior flooded bowl-like regions on the moon's surface. (1 point) maria highlands craters basins 2. Depressions on the moon formed by large meteorites are called ____. (1 point) maria mountains craters ...
Wednesday, October 17, 2012 at 10:49pm

Science
humans,other mammals,birds can maintain a constant body temperature. why is this a useful adaptation? how does this explain the spread of these animals around earth?
Wednesday, October 17, 2012 at 10:43pm

science
where does the earth loose energy to ??
Wednesday, October 17, 2012 at 10:28pm

PHYSICS
A long-straight wire carries a current and is aligned with the North-South direction. You place a compass 4 cm directly above the wire and above the North/East/South/West plane. The compass needle, which initially pointed North (far away from the wire) is now deflected by 20o ...
Wednesday, October 17, 2012 at 3:36pm

Science
19. Which of the following base unit definitions was changed from being based on an arc of the earth to a time interval of light? second kilogram meter candela
Wednesday, October 17, 2012 at 7:43am

physics
a teniss ball thrown vertically upward reaches a maximun height of 33 meters above the surface of earth. at its maximun height the speed of he tennis ball is
Tuesday, October 16, 2012 at 7:00pm

Physics
An asteroid with mass m = 1.85*10^9 kg comes from deep space, effectively from infinity, and falls toward Earth. How much work would have to be done on the asteroid by friction to slow it to 550 m/s by the time it reached a distance of 1.50*10^8 m from Earth?
Tuesday, October 16, 2012 at 6:34pm

Physics
If an artificial earth satellite is in an orbit around the earth’s equator with a period of exactly 1 day, how does its motion look to an observer on the rotating earth if it orbits in the same direction as the earth turns? (Such an orbit is said to be geosynchronous; ...
Tuesday, October 16, 2012 at 2:36pm

algebra
Write a formula that relates temperature t in degrees Fahrenheit at altitude h (in thousands of feet) and a ground temperature of 65ºF. State any restrictions on h. b. Find the temperature at 11,000 ft above Earth’s surface.
Tuesday, October 16, 2012 at 11:52am

Physics HELP!!
What is the acceleration due to gravity at 7220km above the Earth's surface? Take the radius of the Earth to be 6.37e6m and the mass of the Earth to be 5.972e24kg.
Tuesday, October 16, 2012 at 11:22am

physics
3. A satellite of mass 500 kg orbits the Earth with a period of 6000 s. The Earth has a mass of 5.98 x 1024 kg. (a) Calculate the magnitude of the Earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the Earth's surface.
Monday, October 15, 2012 at 8:46pm

physics
what is a satellite's altitude above the surface of the earth if earth's mass is 5.98*10^24 kg and its radius is 6380 km?
Monday, October 15, 2012 at 8:14pm

earth
The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]
Monday, October 15, 2012 at 3:09pm

Science
If Sam weigs 114kg on earth what is his mass on the moon
Monday, October 15, 2012 at 6:42am

Science
If Sam weights 114kg on earth what is his mass on the moon
Monday, October 15, 2012 at 6:32am

College Chem
The density of the Earth is about 3.5g/cubic centimeters. If the Earth has a radius of 1.126 by 10 (to the seventh power) meters, what is its mass? (hint: volume= 4(pie)r(to the third power)/3; 1 meter=100 centimeters
Sunday, October 14, 2012 at 10:32pm

AP Physics B
A 1010 kg geosynchronous satellite orbits a planet similar to Earth at a radius 1.97 × 105 km from the planet’s center. Its angular speed at this radius is the same as the rotational speed of the Earth, and so they appear stationary in the sky. That is, the period ...
Sunday, October 14, 2012 at 7:30pm

physics
At the surface of a certain planet, the gravitational acceleration has a magnitude of 15.0 . A 28.0- brass ball is transported to this planetWhat is the mass of the brass ball on the Earth and on the planet
Sunday, October 14, 2012 at 11:05am

Physics
When a spacecraft travels from the Earth to the Moon, both the Earth and the Moon exert a gravitational force on the spacecraft. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's gravity. How far from the Earth&#...
Saturday, October 13, 2012 at 4:00pm

physics
A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two ...
Friday, October 12, 2012 at 3:48pm

physics
what device could use th earth's magnetic felds to produce energy and how it would work?
Friday, October 12, 2012 at 3:07pm

physics
why one cannot find the north pole of the earth using only a simple compass
Friday, October 12, 2012 at 3:04pm

Physics
Which direction (Eastwards or Westwards) in the sky would the Sun appear to move as seen by a stationary observer on the surface of the hypothetical planet that has a sidereal rotation (on its axis) period of 120 days, and a revolution (around the Sun) period of 40 days, where...
Friday, October 12, 2012 at 12:41pm

physics
The satellite is in a circular orbit 400 km above the Earth's surface, where the free-fall acceleration is 8.71 m/s2. The radius of the Earth is 6400 km. Determine the speed of the satellite.
Friday, October 12, 2012 at 12:29pm

science
Why does the sun and moon appear to be the same size when viewed from earth.My answer is because the sun is bigger than the moon. Am I correct
Thursday, October 11, 2012 at 10:02pm

physics
Prove that for an earth satellite,the ratio of its velocity at apogee to its velocity at perigee is the inverse ratio of its distances from apogee and perigee.
Thursday, October 11, 2012 at 12:31pm

physcis
A 100.0 kg base runner begins his slide into second base when he is moving at a speed of 4.70 m/s. The coefficient of friction between his clothes and Earth is 0.550. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to...
Wednesday, October 10, 2012 at 8:40pm

P
Calculate the magnitude of the gravitational force exerted on a 1,405-kg satellite that is a distance of two earth radii from the center of the earth.
Wednesday, October 10, 2012 at 2:51pm

Physics
In tests on earth a lunar surface exploration vehicle (mass = 5.90 103 kg) achieves a forward acceleration of 0.215 m/s2. To achieve this same acceleration on the moon, the vehicle's engines must produce a drive force of 1.64 103 N. What is the magnitude of the frictional ...
Wednesday, October 10, 2012 at 2:11pm

earth science
according to the condensation theory the most important factor for the formation of our planet was
Wednesday, October 10, 2012 at 1:09pm

Astronomy
A polar satellite, in a low Earth orbit passing over both poles, makes 16 orbits each day. Viewed from Earth, how far apart in longitude are its consecutive passes over the equator?
Wednesday, October 10, 2012 at 12:56pm

earth science
Astonomers think planets formed from interstellar dust and gases that clumped together in a process called
Wednesday, October 10, 2012 at 11:43am

Chemistry
Most of the earth is made of what? Is it helium?
Tuesday, October 9, 2012 at 11:58pm

Physics- Elena please help!
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Tuesday, October 9, 2012 at 11:26am

Physics- PLEASE HELP
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Monday, October 8, 2012 at 9:40pm

physics
A satellite circles the earth in an orbit whose radius is 2.01 times the earth's radius. The earth's mass is 5.98 x 1024 kg, and its radius is 6.38 x 106 m. What is the period of the satellite?
Monday, October 8, 2012 at 6:25pm

Physics
A ferry is crossing a river. The ferry is headed due north with a speed of 1.7 m/s relative to the water and the river’s velocity is 2.4 m/s to the east. a) What is magnitude of the boat’s velocity relative to Earth? Answer in units of m/s b) Find the direction in ...
Monday, October 8, 2012 at 10:16am

Science
How many minutes are required for a radio signal to travel from Earth to a space station on Mars if Mare is 7.83 x 10 to the 7th power km?
Monday, October 8, 2012 at 2:03am

Science
How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 x 10 to the 5th exponent?
Monday, October 8, 2012 at 1:58am

physics
Consider the Earth and a cloud layer 600 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 2.0 km2 = 2000000 m2, what is the capacitance?
Sunday, October 7, 2012 at 10:38pm

Physics
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Sunday, October 7, 2012 at 8:30pm

Physics HELP!
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Sunday, October 7, 2012 at 7:24pm

Physics URGENT!!!
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Sunday, October 7, 2012 at 2:51pm

Physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 3.70 104 s. What is the speed at which the satellite travels?
Saturday, October 6, 2012 at 11:20pm

Physics (Kinematics)
A ball is thrown 83.3 m upward and then falls back to earth.Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s
Saturday, October 6, 2012 at 2:32am

Physics HELP!
A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical energy is lost due to ...
Friday, October 5, 2012 at 11:24pm

PLEASE read over essay
I did this for chemistry. Are the examples and grammer correct? THANK YOU SO MUCH TO WHOEVER ACTUALLY TAKES THE TIME TO READ THIS I LOVE YOU OMG. Naming Chemical Compounds By: Bryce R The periodic table is made up of the most simplest and complex elements. These elements ...
Thursday, October 4, 2012 at 10:45pm

physics
What is the speed of a satellite in a geosynchronous orbit about Earth?
Thursday, October 4, 2012 at 10:21pm

physics
You are an astronaut (m = 90 kg) and travel to a planet that is the same mass and size as Earth, but it has a rotational period of only 15 h. What is your apparent weight at the equator of this planet?
Thursday, October 4, 2012 at 10:18pm

physics
When a spacecraft travels from Earth to the Moon, the gravitational force from Earth initially opposes this journey. Eventually, the spacecraft reaches a point where the Moon's gravitational attraction overcomes the Earth's gravity. How far from Earth must the ...
Thursday, October 4, 2012 at 10:17pm

Physics
A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it takes the package to hit the ground? [Hint: The package's initial speed equals the helicopter's]
Thursday, October 4, 2012 at 9:34pm

Free Fall
The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X?
Thursday, October 4, 2012 at 7:09pm

physics
Which of the following correctly describe the gravitational attraction between Earth and the Moon? -The Earth and the Moon exert equal size gravitational forces on each other. -The gravitational force of the Moon on the Earth is towards the Moon. -Both the Earth and the Moon ...
Thursday, October 4, 2012 at 7:05pm

science
On Earth, the ratio of the force (newtons) to the mass (kilograms) of an object is always the same
Thursday, October 4, 2012 at 6:52pm

social studies
How much of the earth's surface is water?
Thursday, October 4, 2012 at 5:52pm

Earth Science
Renewable resources can be replaced as fast as they are consumed? It is true or false?
Thursday, October 4, 2012 at 12:49pm

Physics 1
Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
Thursday, October 4, 2012 at 11:18am

physics
A space traveler weighs 635 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
Thursday, October 4, 2012 at 1:03am

Physics
(a) Calculate the magnitude of the gravitational force exerted on a 488-kg satellite that is a distance of 1.95 times earth radii from the center of the earth. (b) What is the magnitude of the gravitational force exerted on the earth by the satellite? (c) Determine the ...
Thursday, October 4, 2012 at 12:58am

Physics
In tests on earth a lunar surface exploration vehicle (mass = 5.90 103 kg) achieves a forward acceleration of 0.215 m/s2. To achieve this same acceleration on the moon, the vehicle's engines must produce a drive force of 1.64 103 N. What is the magnitude of the frictional ...
Thursday, October 4, 2012 at 12:49am

physics
A 5.9-kg rock and a 3.0 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.
Wednesday, October 3, 2012 at 11:42pm

physics
The Hubble Space Telescope orbits Earth 621 km above Earth's surface. What is the period of the telescope's orbit? Give answer with 5 significant figures.
Wednesday, October 3, 2012 at 10:24pm

Physics 1
Find the ratio of your weight on the Earth to your weight on the surface of the Earth's Moon. WEarth/WEarth's Moon=
Wednesday, October 3, 2012 at 9:50pm

science
how many days would it take to fly to Jupiter (from Earth) in a space shuttle at 45,000 miles per hour? The minimum distance between the Earth and Jupiter is 365 million miles.
Wednesday, October 3, 2012 at 9:44pm

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