สงสัยครับ เพราะน้ำมันนี่เต็มถัง ก็เพิ่มน้ำหนังรถอีกกว่าหกสิบกิโลเลยนะครับ อย่างนั้นแก๊สหรือไฟฟ้าก็น่าจะทำให้รถเบากว่า
Ecar 7/24/2008 11:12:29 AM
Before considering whether something has weight, you must first know what
weight is. Weight is a force. Weight is how much gravitational force an
object feels. On the Earth, your weight is how hard the Earth pulls on you
by means of gravitational force.
You must also know what mass is. Mass is a measure of how much material an
object is made of. Any object far away from any planets or stars will have
mass but not weight. It is not possible to have weight without mass. If
something felt a force (such as gravity) but had zero mass, the object would
experience infinite acceleration.
Before continuing, consider something. Think of a real-life example of
electricity. Then ask yourself just what gravity would be pulling on. In
most cases, the answer turns out to be the electrically charged particles
that feel and exert the electric force. Quite often, electrons are the
particles involved. “Electricity” flowing through a wire is not actually
electricity. It is a set of electrons flowing through a wire, often called
electric current. Static electricity on a balloon or on a wall is not
electricity. It is too many or too few electrons, causing a build-up of
electric charge. When a set of electric charges are close enough to notice
each other, true electricity is the pushing or pulling between these
particles due to their electric charges. The particles have weight, not the
force between them.
Dr. Ken Mellendorf
Physics Instructor
Illinois Central College
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Dr. Ken Mellendorf 7/25/2008 11:41:11 AM
ก๊าซก็มีน้ำหนัก ถังบรรจุก๊าซก็หนัก แบตเตอรีก็หนัก รถใช้ก๊าซหรือไฟฟ้าจะเบากว่ารถใช้น้ำมันไหมหนอ ถ้าพิจารณาเฉพาะส่วนที่เกี่ยวกับเชื้อเพลิง
สงสัย สงสัย
อือ 7/25/2008 12:35:11 PM
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