Recent content by lwymarie

http://sciencenow.sciencemag.org/cgi/content/full/2008/619/2 What do you think about the possible causes?

http://sciencenow.sciencemag.org/cgi/content/full/2008/620/2 This article is about Martian ice. Why can't it be dry ice? Why are the scientists so sure that it is water ice?

Number 391 (Story #1), September 15, 1998 by Phillip F. Schewe and Ben Stein ANOMALOUS ACCELERATION. Data from several spacecraft , including Pioneer 10 and 11, Galileo, and Ulysses, provide evidence for an unexplained, weak, long-range acceleration, a new report shows. Position and velocity...

do you have any ideas?

Number 857 #2, February 28, 2008 by Phil Schewe More Spacecraft Velocity Anomalies A new look at the trajectories for various spacecraft as they fly past the Earth finds in each case a tiny amount of surplus velocity. For craft that pursue a path mostly symmetrical with respect to the...

The resistivity arises because the electrons collide with atoms so they flow slower. The resistivity of different metals differ a lot. What determines the electrical resistivity of different metals? It is related to their structure? How?

or are they 1/8 of a sphere at the corners and 1/4 of a sphere at the edge?

I was reading a physics textbook. It is stated that force is defined by mass and acceleration (a force of 1N causes a mass of 1kg to accelerate at 1ms^-2). In later part, it is stated that mass is defined by force and acceleration (a mass acted by a force of 1N accelerates at 1ms^-2 is 1kg). As...

why will ultrasonic waves not interfere with other sound waves in water?

I heard from a TV program that higher density of the early universe resulted in a faster expansion rate, and the lower density of the present universe has a lower expansion rate. Could anyone please expalin to me why? Thanks =)

Why does high power magnification result in a dim image? thanks =)

from wikipedia: "a plasma is typically an ionized gas, and is usually considered to be a distinct phase of matter. "Ionized" in this case means that at least one electron has been dissociated from a proportion of the atoms or molecules." 1. Since electrons has been dissociated only but not...

Sorry to everyone :)

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So toxic materials may be deposited at the bottom?