Category Archives: 2012

Asteroid: Calculate the change in the length of a day due to the impa?

Suppose an asteroid of mass 6e20 kg is nearly at rest outside the solar system, far beyond Pluto. It falls toward the Sun and crashes into the Earth at the equator, coming in at an angle of 30 degrees to the vertical, against the direction of rotation of the Earth. It is so large that its motion is barely affected by the atmosphere.

Impact Speed: 43474.4226

Calculate in hours the change in the length of a day due to the impact: ????

I have been trying this equation and solving for T and have gotten wrong answers each time:

-sin(theta)*R_1*M_a + 2/5*M_e*R_1^2*(2pi/8.64e4) = 2/5M_e*R_1^2(2pi/T)

R_1: 6.4e6
M_e: 6e24
8.64e4 = how many seconds in an hour
yes sorry!!!!! its supposed to be -sin(theta)*R_1*V_impact*M_a + ………

ugh i cant believe i left that out
Also, I only have one submission left for my HW so if anybody can back the first answer up that would be fantastic

What impact does Trojan Asteroid have on planet Earth?

What impact does Trojan Asteroid have on planet Earth?

What are the dates that the Jehovah’s Witnesses predicted the end of the world?

I think they were 1925, 1975, & 1989.
Synthyia, thanks.

Los Mayas (Spanish) 2008 Wall Calendar

Los Mayas (Spanish) 2008 Wall Calendar

Los Mayas (Spanish) 2008 Wall Calendar

  • Los Mayas (Spanish) 2008 Wall Calendar

Los Mayas (Spanish) 2008 Wall Calendar

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Would you please help me to correct my speech?

Hello, ereryone,my teacher asked me to give a English Speech,But I think there many mistakes in my speech,so my dearest.would please help me to correct my mistakes in my speech.Thank you very mucn!

I ‘ll use my body language.and I ‘ll draw some figure on the blackboard to help my speech

Hello,boys and girls:

I ‘m very glad to give a speech today.The title is mountaineering.As we all know the Everst is the highest peak in the world. The height is 8848 meters. So the mountain is coverd by snow all the year around.and many of the snow has changed into ice yet.Considering it’s so cold ,you have to wear as warm as you can when you climb the mountain.

Now,something to care about:

1.tools:

If the brae is flat ,that’s easy to climb.But most of it is abrupt,then the tools is very necessary.One of the tools looks like a “7″ each hand holds the handle,use your strength to attack the “7″ into the snow.one hand by one hand , you can clime higher and higher.

2.group work

There’s a whole line connects all the members together.And everyone was firmed by many lines.At the end of the line tied a corkscrew.Before the next step you must circumgyrate the corkscrew into the ice ,of course your parner who behind you will circumgyrate it out when it’s necessary. If your arms can’t bear any more ,you’ll fall down .so the corkscrew will save your life.but,sometimes the corkscrew will fall down,too.If your goup just have two or three members ,it’s very dandgerous.maybe all of your cordscrow will be pulled out in a short time.But if your group has ten members or so,that’ll be safer.

3.snow blindness

Just imagining.all the mountains are covered by snow it’s white,all the sky is white.So,you must close your eyes when the sunshine is very bright.or,Even keep your eyes open ten minutes you ‘ ll become blind. This kind of blind called snow blindness.

To tell the truth.I’m member of the Mountaineering Union in Xiamen University.You are wellcome to jion us.To be certainty remember:1.tools 2.group work 3.snow blindness.

Thank you for litsining !