Friday

April 18, 2014

April 18, 2014

Number of results: 33,345

**Phsyics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 kg and a radius of 8.50 km. What is the speed of a satellite orbiting 4.70 km above the surface? What is the escape speed from the asteroid?
*Tuesday, April 13, 2010 at 3:16pm by Mikhail Moskvich*

**physics**

Consider an asteroid with a radius of 15.5 km and a mass of 3.46E+15 kg. Assume the asteroid is roughly spherical. What is the acceleration due to gravity on the surface of the asteroid? Suppose the asteroid spins about an axis through its center, like the Earth, with a ...
*Sunday, November 15, 2009 at 3:24pm by Hamp*

**physics**

An asteroid is discovered to have a tiny moon that orbits it in a circular path at a distance of 122 km and with a period of 43 h. The asteroid is roughly spherical (unusual for such a small body) with a radius of 19 km. (a) Find the acceleration of gravity at the surface of ...
*Sunday, October 30, 2011 at 8:58pm by mymi*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*Friday, October 4, 2013 at 11:18pm by Jeff*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*Friday, October 4, 2013 at 11:19pm by Jeff*

**physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of about 2...
*Tuesday, December 13, 2011 at 5:23pm by Millie*

**physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of about 2...
*Tuesday, December 13, 2011 at 6:36pm by Millie*

**Physics**

The Near Earth Asteroid Rendezvous (NEAR), after traveling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroid's center. Eros is roughly box-shaped, with dimensions 40 km 6 km 6 km. Assume Eros has a density (mass/volume) of about 2...
*Tuesday, December 13, 2011 at 10:02pm by Millie*

**Physics**

(a) What is the escape speed on a spherical asteroid whose radius is 535 km and whose gravitational acceleration at the surface is 3.0 m/s2? 1 ? m/s (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 1000 m/s? 2 ? m (c) ...
*Monday, March 21, 2011 at 3:25pm by Steve*

**Physics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 and a radius of 8.50km . What is the speed of a satellite orbiting 4.70km above the surface? What is the escape speed from the asteroid?
*Wednesday, April 7, 2010 at 1:21am by Hoa*

**Physics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 and a radius of 8.50 . What is the speed of a satellite orbiting 4.70km above the surface? What is the escape speed from the asteroid?
*Thursday, April 15, 2010 at 12:43am by Mikhail*

**PHS 105**

At a particular instant, two asteroids in inter-stellar space are a distance r = 20 km apart. Asteroid 2 has 10 times the mass of asteroid 1, m2 = 10 m1. 1. If the acceleration of the asteroid 1 toward the asteroid 2 is 1.0 m/s2 , what is the acceleration of the asteroid 2?
*Monday, March 17, 2014 at 4:57pm by Mel*

**College Physics w/Calculus**

(a) What is the escape speed on a spherical asteroid whose radius is 570 km and whose gravitational acceleration at the surface is 3.1 m/s2? (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 1000 m/s? (c) With what speed...
*Tuesday, December 14, 2010 at 5:24pm by Oriana*

**Physics**

You don't need the weight or mass of the satellite. Use Kepler's Third Law in Newton's form (with the asteroid mass M, and G). The distance R from the center of the asteroid is 13.2 km. That is what you will need in the formula. There is a standard formula for escape speed in ...
*Wednesday, April 7, 2010 at 1:21am by drwls*

**Science**

The Asteroid433Eros has a mass of 7.2 x 1015 kg, and a radius of = 11 km. Â What is the escape velocity of this asteroid (remember to use r in meters)?Â What consequence would this have for someone trying to walk on this asteroid?
*Thursday, June 13, 2013 at 10:09pm by Mia*

**Physics**

Asteroid satellite: While on its way to Jupiter in 1993, the Galileo spacecraft made a flyby of asteroid Ida. Images captured (Fig. P5.66) of Ida discovered that the asteroid has a tiny moon of its own, since given the name Dactyl. Measurements found that Ida to be about 55 × ...
*Tuesday, September 20, 2011 at 9:01pm by Kaylee*

**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 by Caitlin*

**Physics**

A uniform, solid, spherical asteroid with mass 1.2 * 10^13 kg and radius 1.0 km is rotating with a period of 4.6 hours. A meteoroid moving in the asteroid's equatorial plane crashes into the equator at 9.0 km/s. It hits at a 58° angle to the vertical and embeds itself at the ...
*Friday, November 9, 2012 at 7:00pm by Zack*

**Astronomy**

1. Consider an asteroid of radius 2 km and density 2,500 kg/m^3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing rock to great ...
*Monday, December 9, 2013 at 3:49pm by keitanako*

**Physics**

You need to provide units for your quantities. I will have to assume your 8.50 is km and your 10^16 is kg. 4.70 km above the surface is R = 13.2 km (or 1.32*10^4 m) from the center The orbital speed satisfies G M/R^2 = V^2/R where M is the asteroid mass and you know what G is...
*Thursday, April 15, 2010 at 12:43am by drwls*

**physics**

Evidence suggests that there are trillions of dollars' worth of minerals and metals buried in Near Earth Asteroids (the ones that come close to the Earth, not the ones in the asteroid belt between Mars and Jupiter). Many scientists think an asteroid mining mission is easily ...
*Thursday, March 18, 2010 at 7:24pm by Jeff*

**Physics180**

Tidal forces can break apart objects that orbit too close to a planet, producing rings like those of Saturn. Consider an asteroid 600km in radius, 65mm from Saturn's center. What's the difference in gravitational acceleration between the two sides of the asteroid?
*Saturday, November 5, 2011 at 7:01pm by Alan*

**Physics**

An asteroid revolves around the Sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. (6.38*10^6 radius) I dont understand how to solve this problem.
*Tuesday, November 17, 2009 at 8:18pm by Angel*

**physics**

An asteroid, whose mass is 2.0 10-4 times the mass of Earth, revolves in a circular orbit around the Sun at a distance that is 2.9 times Earth's distance from the Sun. (a) Calculate the period of revolution of the asteroid in years. (b) What is the ratio of the kinetic energy ...
*Sunday, April 8, 2007 at 1:13pm by gobind*

**Physics**

Given an acceleration of 0.6 m/s/s, on the surface of an asteroid with a radius of 1200 meters, find the mass of the asteroid.
*Friday, March 8, 2013 at 12:14pm by Jordyn*

**physics**

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
*Monday, May 31, 2010 at 9:42am by janie*

**physics**

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
*Monday, May 31, 2010 at 10:36am by Anonymous*

**physics**

the near earth asteroid Rendezvous (NEAR), after travelling 2.1 billion km, is meant to orbit the asteroid Eros at a height of about 15 km from the asteroidal center. Eros is roughly box-shaped, with dimensions 40km x 6km x 6km. Assume eros has a density (mass/ volume) of ...
*Sunday, October 4, 2009 at 6:30pm by jasmine*

**physics help pleaseee**

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
*Monday, May 31, 2010 at 11:23am by Anonymous*

**Astronomy**

Consider an asteroid of radius 2 km and density 2,500 kgm3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing rock to great distance ...
*Sunday, December 23, 2012 at 2:35pm by sam*

**Physics**

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid, which then allows the asteroid to move at 28 degrees to its original path to a speed of 20km/s. What is its average accleration for acceleartion at (x) ...
*Wednesday, January 21, 2009 at 11:01am by Harold*

**Physics**

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid, which then allows the asteroid to move at 28 degrees to its original path to a speed of 20km/s. What is its average accleration for acceleartion at (x) ...
*Wednesday, January 21, 2009 at 9:49pm by Harold*

**Physics**

Speed of Asteroids With the same Radius? Two spherical asteroids have the same radius R . Asteroid 1 has mass M and asteroid 2 has mass 2M. The two asteroids are released from rest with distance 10R between their centers. What is the speed of each asteroid just before they ...
*Tuesday, April 12, 2011 at 9:06pm by Dan*

**physical science**

Assume this asteroid has the shape of a sphere. A rock sitting on the surface of the asteroid has a weight of 100 newtons. What would the weight of this rock be if it were moved to a distance above the surface equal to the radius of the asteroid? It may be helpful to draw a ...
*Monday, March 21, 2011 at 4:44pm by aaron*

**Astronomy**

First compute the mass of the asteroid from its density and radius,r. Call it m. m = (4/3)pi*r^3 Then compute E = G*M*m/R, where R is the radis of the Earth M is the mass of the Earth m is the mass of the asteroid G is Newton's universal constant of gravity E is the energy of ...
*Sunday, December 23, 2012 at 2:35pm by drwls*

**physics**

I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.
*Thursday, December 9, 2010 at 10:37pm by annie*

**Physics-Update**

An asteroid heads for Earth at 12 km/s. In addition, a NASA space team is able to attach a rocket booster to the asteroid. The rocket booster fires for 10 min after which the asteroid is moving at 28 degrees to its original path to a speed of 20km/s. What is its average ...
*Wednesday, January 21, 2009 at 10:29pm by Harold*

**physics**

The asteroid Ceres has a mass 7.061 × 1020 kg and a radius of 505.2 km. What is g on the surface? The value of the universal gravitational constant is 6.67259 × 10−11 N · m2/kg2.
*Wednesday, February 2, 2011 at 5:57pm by annn*

**Physics**

The Earth has an angular speed of 7.272·10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 3.45·1022 kg) hits the Earth while traveling at a speed of 4.41·103 m/s (assume the asteroid is a point mass compared to the radius of the Earth) in each of the ...
*Thursday, November 8, 2012 at 4:39pm by Joe Frank*

**physics**

Which piece of him? Seriously, consider using the inverse square law. The earth's radius is 6378 km 20,000 ft is 6.1 km higher
*Saturday, January 15, 2011 at 3:32pm by drwls*

**physics**

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
*Monday, May 31, 2010 at 1:06pm by janie*

**Physics**

In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
*Saturday, July 30, 2011 at 12:17pm by Geek*

**Physics calculus based**

Consider the Sun to be at the origin of an xy-coordinate system. A telescope spots an asteroid in the xy-plane at a position given by (x, y) with a velocity given by (vx, vy). [DATA: (x, y) = (3.3, 5.2) ×10^11 m; (vx, vy) = (-6.1, -4.0) ×10^3 m/s.] (A) What will the asteroid's...
*Tuesday, June 19, 2012 at 6:54pm by JASON*

**Physics **

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 4.3 1011 m. Find the period of the orbit.
*Monday, June 25, 2012 at 11:26am by Sierra*

**physics**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 5.7 1011 m. Find the period of the orbit.
*Thursday, October 4, 2012 at 10:19pm by Garcia*

**earth-physics**

The Earth has an angular speed of 7.272 10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 1.07 1022 kg) hits the Earth while traveling at a speed of 1.30 103 m/s (assume the asteroid is a point mass compared to the radius of the Earth) in each of the ...
*Sunday, February 26, 2012 at 7:35pm by huiol*

**Physics**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 3.01 x1011 m. Find the period of the orbit.
*Tuesday, September 20, 2011 at 10:37pm by Please Help*

**Physics**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 4.0 1011 m. Find the period of the orbit IN SECONDS!!!???
*Saturday, October 22, 2011 at 3:39am by Anon*

**Physics 1**

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 5.8 1011 m. Find the period of the orbit. _____s
*Wednesday, October 3, 2012 at 9:53pm by John *

**Physics 1 **

The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 5.8 1011 m. Find the period of the orbit. _____s
*Thursday, October 4, 2012 at 11:19am by John *

**physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3740-kg space tug and a 6500-kg asteroid. They pull on the asteroid with a force of 470 N. Initially the tug and the asteroid are at rest, 480 m apart. How much time does it ...
*Tuesday, March 1, 2011 at 1:46pm by lizz*

**Physics**

The period of the earth around the sun is 1 year and its distance is 150 million km from the sun. An asteroid in a circular orbit around the sun is at a distance 475 million km from the sun. What is the period of the asteroid’s orbit? Answer in units of year
*Tuesday, February 12, 2013 at 6:43pm by Chelsea *

**Physics Homework**

Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy does ...
*Sunday, October 20, 2013 at 12:46am by Eli Smith*

**Phsyics**

1) set v^2/r=G*mass/r^2 where r is radius asteroid + altitude. solve for v 2) 1/2 vescape^2=GMaste/radius
*Tuesday, April 13, 2010 at 3:16pm by bobpursley*

**College Physics w/Calculus**

(a) Potential enegy increase = -M*Integral of g(r) dr (R to infinity) = -M*g(R)*R^2/r^2 dr = M*g(R)/R = (1/2) M Vo^2 Vo = sqrt(2g(R)*R) = 1880 m/s is the escape velocity (b) PE change = M*[g(R)*R^2(1/R - 1/r) g(R)*R/r] = (1/2) M V^2 2 g(R)* R^2 (1/R - 1/r) = V^2 2g(R)*R - V^2...
*Tuesday, December 14, 2010 at 5:24pm by drwls*

**Math**

19. A family takes a car trip. They travel for an hour at 80 km/h and then for 2 hours at 40 km/h. Find the average speed. (Hint, Remember to consider the total distance and the total amount of time.)
*Friday, April 26, 2013 at 10:45pm by June*

**p``**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3640 kg space tug and a 6500 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 500 m apart...
*Monday, November 1, 2010 at 9:21pm by megan*

**Physics**

To work with consistent units, you need to convert 69.8 km/h to m/s, namely 69.8 km/h * 1000 m/km / 3600 s/h = 69.8*1000/3600 km*m*h/(h*km*s) = 19.39 m/s After that, solve for a in F=ma, where F and m are known. The time required in seconds can be obtained by dividing 19.39 m/...
*Monday, October 25, 2010 at 10:31pm by MathMate*

**physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3640 kg space tug and a 6500 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 500 m apart...
*Monday, November 1, 2010 at 8:05pm by phillip*

**Physics Homework**

Consider problem U concerning the geosynchronous satellite of mass 50 kg. It orbits at a radius of 42,300 km with a speed of 3076 m/s. a) How much energy is needed to lift the satellite from the earth's surface (Re=6,370 km) up to that radius? b) How much kinetic energy does ...
*Sunday, October 20, 2013 at 1:44am by Eli Smith*

**science **

Astronomers study an asteroid that is moving quickly toward Jupiter. Which statement describes how the gravitational attraction between the asteroid and Jupiter will most likely change? A. The gravitational force will increase as the distance between the asteroid and Jupiter ...
*Monday, February 17, 2014 at 9:04pm by victoria *

**Physics- PLEASE HELP**

Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...
*Thursday, October 25, 2012 at 4:03pm by Anonymous*

**physics 12**

A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be expended so that the spacecraft may rise to a height of 2800 m above the surface of the asteroid? Thanks.
*Saturday, October 8, 2011 at 2:57pm by roy*

**Physics- Elena please help!**

Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...
*Monday, October 29, 2012 at 6:32pm by Sarah*

**algebra**

how do you write and solve an equation to determine the radius of mars the radius of earth is 6378.1 km, which is 2981.1 km longer than the radius of mars
*Saturday, September 12, 2009 at 1:10pm by delisa*

**Physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3400 kg space tug and a 6000 kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 420 m apart...
*Tuesday, September 2, 2008 at 10:06pm by Lisa*

**Physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3760-kg space tug and a 6100-kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 490 m apart...
*Sunday, October 3, 2010 at 4:10pm by Xavier*

**Physics**

At a time when mining asteroids has become feasible, astronauts have connected a line between their 3760-kg space tug and a 6100-kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 490 m apart...
*Sunday, October 3, 2010 at 6:36pm by Xavier*

**gravity**

You are an astronaut in the space shuttle pursuing a satellite in need of repair. You are in a circular orbit of the same radius as the satellite (450 km above the Earth), but 24 km behind it. How long will it take to overtake the satellite if you reduce your orbital radius by...
*Saturday, November 19, 2011 at 2:17pm by mje*

**Physics**

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7000 to 5000m/s. (a) What is the work done by the force? (b) If the ...
*Friday, April 4, 2014 at 6:22pm by Elle*

**science**

What is the average speed of a satellite given the following information. 1) The earth's radius = 6000 km 2) The satellite is 900 km from the earth's surface 3) The satellite's orbital period: 2 hours 4) Circumference = 2pr (p = 3.14) A) 6 km/s B) 10 km/s C) 5 km/s D) 8 km/s
*Monday, February 10, 2014 at 9:10pm by Tori*

**physics**

Consider the Sun to be at the origin of an xy-coordinate system. A telescope spots an asteroid in the xy-plane at a position given by (1.8 1011 m, 3.1 1011 m) with a velocity given by (-8.4 103 m/s, -6.3 103 m/s). What will be the magnitude of the asteroid's velocity and it's ...
*Tuesday, March 6, 2012 at 9:44am by sana*

**Physics**

A particular asteroid has a circular orbit about the Sun with a radius of 450 million miles. How long does it take to go around the sun? Compare the prediction of Kepler's 2nd law to a direct computation with Newton's 2nd law. How much area does the line connecting the ...
*Thursday, December 5, 2013 at 7:50pm by Shelby*

**Algebra**

Available evidence suggests that about 20 percent of the asteroid’s mass turned to dust and spread uniformly over Earth after eventually settling out of the upper atmosphere. This dust amounted to about 0.02 g/cm^2 of Earth’s surface. The asteroid very likely had a dentistry ...
*Monday, August 16, 2010 at 11:29am by Kate*

**physics**

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.9 × 104 kg, and the force causes its speed to change from 7600 to 5400 m/s. (a) What is the work done by the force? (b) If the ...
*Monday, February 28, 2011 at 11:25am by shaknocka*

**physics**

A package of mass 9 kg sits at the equator of an airless asteroid of mass 4.0 1020 kg and radius 4.9 105 m. We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid it will be traveling with speed 185 m/s. We have a ...
*Friday, November 1, 2013 at 3:28am by Jaden*

**Physics**

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
*Wednesday, February 27, 2013 at 11:53pm by John*

**Physics**

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
*Friday, March 1, 2013 at 6:43pm by John*

**physics**

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
*Monday, February 25, 2013 at 11:56am by Anonymous 007*

**phYSICS!!!**

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
*Tuesday, February 26, 2013 at 11:28am by Anonymous 100*

**physics**

What is the radius of the event horizon (or Schwartzchild radius) of approximately 4 million solar masses at the center of our galaxy? A. 1200 m; B. 12*10^6 km; C. 12*10^9 km; D. 12*10^12 km.
*Monday, December 30, 2013 at 4:49pm by Alice*

**PHYSICS!!!**

Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
*Wednesday, February 27, 2013 at 3:38am by please urgently needed!!!*

**physicx**

The radius of the orbit of a geosynchronous satellite is 36000 km. then the period of revolution of a satellite with its orbital radius 9000 km would be ?
*Wednesday, November 13, 2013 at 9:53am by satya*

**physics**

A meteoroid is speeding through the atmosphere, traveling east at 19.5 km/s while descending at 12.7 km/s. What is its speed, in km/s?
*Wednesday, October 2, 2013 at 12:42am by Ash*

**pyramids**

a car travels 35 km in the first 20 minutes, 43 km in the second 30 minutes and 19 km in the last 18 minutes of a trip. what is the average speed in Km/mn?
*Saturday, January 8, 2011 at 5:33pm by Eloise*

**Physics**

A meteoroid is speeding through the atmosphere, traveling east at 19.0 km/s while descending at a rate of 12.9 km/s. What is its speed, in km/s?
*Wednesday, January 30, 2013 at 5:35pm by Dee*

**physics-STEVE OR DR>BOBB 22**

The radius of the orbit of a geosynchronous satellite is 36000 km. then the period of revolution of a satellite with its orbital radius 9000 km would be ?
*Wednesday, November 13, 2013 at 9:11pm by stantry*

**Astronomy**

Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards the Sun and towards ...
*Sunday, December 23, 2012 at 2:35pm by sam*

**science**

An asteroid in an elliptical orbit about the sun travels at 2.0 106 m/s at perihelion (the point of closest approach) at a distance of 3.8 108 km from the sun. How fast is it traveling at aphelion (the most distant point), which is 8.3 108 km from the sun?
*Wednesday, September 12, 2012 at 9:22pm by Anonymous*

**physical**

An asteroid in an elliptical orbit about the sun travels at 3.9 106 m/s at perihelion (the point of closest approach) at a distance of 3.7 108 km from the sun. How fast is it traveling at aphelion (the most distant point), which is 8.6 108 km from the sun?
*Thursday, January 24, 2013 at 10:36pm by ahmed*

**Physics**

Two main strategies are employed to deflect an asteroid: destruction or slowing it down by at least 425 s so that the earth can move out of the impact zone. Assume perfect inelastic collision. (a) If we know the speed of the asteroid (va), mass (ma), and the distance the ...
*Tuesday, October 22, 2013 at 9:37pm by Milan*

**physics**

A steroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5e4kg and the force causes the speed to change from 7100 to 5500m/s. (A) What is the work done by the force? (B) If the asteroid slows...
*Sunday, February 26, 2012 at 9:06pm by Natasha*

**Physics**

m = 14000 MT * 1000 kg/MT = 1.4*10^7 kg MT = Metric Tons. m = mass. F = ma, a = F/m = 6.45*10^5 / 1.4*10^7 = 0.0457m/s^2. V = 69.8 km/h * 1000 m/km * 1/3600 h/s =19.39 m/s. a = (Vf - Vo) / t = 0.0457, (19.39 - 0) / t = 0.0457, 19.39 / t = 0.0457, Cross multiply: 0.0457t = 19....
*Monday, October 25, 2010 at 9:21pm by Henry*

**physics**

A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 19.8 s to slow down from 81 km/h to 37 km/h. The radius of the curve is 164 m. As the train goes around the turn, what is the magnitude of the ...
*Thursday, June 16, 2011 at 12:27am by JRD*

**physics (correction to Jordan)**

The previous answer posted by Jordan uses a correct approach but the wrong radius for the Earth. The mean radius is 6.378*10^6 km, not 6.98x10^6 m. This makes the answer to part (ii) g'(1000 km) = g(sea level)*(6378/7378)^2 g' = 7.33 m/s^2 The satellite weight at 1000 km ...
*Wednesday, March 10, 2010 at 4:29am by drwls*

**physics**

a). The effective acceleration of gravity, g', is given by (1/2)g'*t^2 = 1.25 m g' = 2.5/9 = 0.28 m/s^2. (or N/kg) b) G M/R^2 = 0.28 N/kg G is the universal gravity constant. Look it up and solve for asteroid mass M. c) g' falls inversely with the square of the distance from ...
*Saturday, January 5, 2013 at 8:55pm by drwls*

**physic**

Neutron stars are extremely dense objects with a mass comparable to the mass of the sun but a radius of only several thousand meters. Consider a neutron star of mass M = 1.99e+030 kg and a radius of R = 10 km. g = 1.3279e12 m/s Assuming uniform density, how much would 1.1 ...
*Wednesday, May 23, 2007 at 11:47pm by x*

**science**

In addition to the information that Damon has provided, you may find this information helpful and interesting: http://science.howstuffworks.com/asteroid-hits-earth.htm Typical asteroid impact speeds, relative to earth, are usually in a range of tens of thousands of mph, ...
*Saturday, December 19, 2009 at 5:50am by drwls*

**Physics**

a) (velocity component across)= (river width)/crossing time)= 2.0 km/hr b) If the boat's speed with respect to water is 2.5 km/h and the component across the river is 2.0 km/h, the downstream component must be 1.5 km/h (Consider the Pythagorean theorem). c) Since it travels at...
*Sunday, March 2, 2008 at 10:41am by drwls*

**Physics**

Your mass and radius of the Earth are not correct. The Earth's radius is 6380 km . F = Msat*Mearth*G/Rsat^2 = Msat* g * (Rearth/R)^2 Rsat = Rearth + 612 km = 6992 km Re/R = 0.9125 g = 9.81 m/s^2 Hubble's weight in that orbit is (0.9125)^2 = 83.3% of its weight on the Earth's ...
*Wednesday, April 6, 2011 at 9:29pm by drwls*

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