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Cui Sci 8
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Gravity
Terms in this set (21)
reactant
An original substance at the beginning of a chemical reaction.
product
A new substance resulting from chemical change.
chemical reaction
A change that causes a new kind of matter to form with different properties.
reactivity
The ability of elements to take part in chemical reactions.
precipitate
The solid product of a chemical reaction in a solution.
metal
A substance that conducts heat and electricity.
conductivity
The degree to which heat or electricity flows through a substance.
insulator
Something that resists the flow of energy, such as heat, electricity, or sound.
superconductor
A material that loses all resistance to electrical flow at extremely low temperatures.
malleable
Capable of being rolled or pounded into flat sheets.
ductile
Capable of being drawn out into wire or thread.
corrosion
The gradual weakening and wearing away of something, usually due to a chemical reaction.
alloy
A mixture of two or more elements, usually metals.
salt
A white substance that is found in sea water and in the earth.
acid
A substance that tastes sour, sharp, or biting.
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Verified questions
ENGINEERING
Use naive Gauss elimination to factor the following system: $$ \begin{aligned} 7 x_{1}+2 x_{2}-3 x_{3} &=-12 \\ 2 x_{1}+5 x_{2}-3 x_{3} &=-20 \\ x_{1}-x_{2}-6 x_{3} &=-26 \end{aligned} $$ Then, multiply the resulting [L] and [U] matrices to determine that [A] is produced.
ENGINEERING
The curved rod $A D$ of radius $r$has a weight per length of $w .$ If it lies in the horizontal plane, determine the resultant internal loadings acting on the cross section at point $B .$ Hint: The distance from the centroid $C$ of segment $A B$ to point $O$ is [/math]C O=0.9745 r .[/math]
ENGINEERING
The vacuum cleaner's armature shaft S rotates with an angular acceleration of $\alpha=4 \omega^{3 / 4} \mathrm{rad} / \mathrm{s}^{2}$ , where $\omega$ is in rad/s. Determine the brush's angular velocity when t=4 s starting from $\omega_{0}$=1 rad/s, at $\theta=0 .$ The radii of the shaft and the brush are 0.25 in. and 1 in , respectively. Neglect the thickness of the drive belt.
ENGINEERING
Why are flaps used at the leading and trailing edges of the wings of large aircraft during takeoff and landing? Can an aircraft take off or land without them?
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