1,2: When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relative little energy is needed to overcome the intermolecular forces, so simple molecular substances have a low melting and boiling points.
3: Water, Almost no living thing can survive without water. Water is everywhere on our planet. It is the reason we have an organic life on earth. A water molecule consists of one oxygen atom combined with two hydrogen atoms. We use water throughout day and night; in drinking, cooking, household needs, industries, and agriculture. Apart from these general uses of water, you might be amazed to know that water plays a major role in volcanic eruptions.
Answer:
a piece of equipment with moving parts that does work when it is given power from electricity, gasoline, etc.
Explanation:
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Why space time curves in the presence of mass or energy?
Answer: A massive body such as the Earth causes gravity because matter is concentrated energy, hence E=mc². But note that a no mass photon also causes gravity, as done any kind of energy, not just mass-energy. Moreover the energy doesn't actually bend the surrounding space.
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Answer:If you look at the image of the toy car in the mirror, it will appear to be the same ... However, there is a virtual focal point on the other side of the mirror if we follow them ... Concave mirrors, on the other hand, can have real images. ... Naturally, in concave mirror, the closer the image to the mirror, the bigger the image formed.
Answer:
The time which a car could accelerate from 0 to 70mph with a us=1.00 and uk=0.80 is
Explanation:
The net force knowing the accelerations must be determinate to get the speed goal
∑F=Fs-Fk=m*a
So knowing the acceleration and knowing the speed the car must get using equation of uniform motion accelerated