Homework answers and tutorials

Waiting for answer How much does the sun weigh?
has a mass of ##1,989*10^30 kg## Weigh is a measurement for gravitational force, so you can't say the sun weights anything if you're not measuring with respect to any other mass. S...
$10.00 
Waiting for answer What is the square root of 36 over 49?
##color(blue)(6/7## First we find the square roots of both numerator and denominator. ##sqrt(36)=sqrt(2*2*3*3)=color(blue)(6## ##sqrt(49)=sqrt(7*7)=color(blue)(7## So, ##sqrt(36)/...
$10.00 
Waiting for answer How do you rationalize the denominator and simplify ##(sqrt(...
##(13 2sqrt(22))/9## Multiply the numerator and the denominator by the reciprocal of the denominator ##sqrt(11)  sqrt(2)## This will give you ##(sqrt11  sqrt2)/(sqrt11 + sq...
$10.00 
Waiting for answer What is the value of the digit 3 in the number 2,135,789?...
##3 xx 10,000 = 30,000## In any number each place value represents a certain power of 10. In ##2,1color(red)(3)5,789##, the place value for the ##color(red)(3)## is ten thousands...
$10.00 
Waiting for answer How do you write chemical equations for combustion reactions...
The combustion of octane ##C_8H_18## follows this reaction ##2C_8H_18 + 25O_2  16CO_2 + 18H_2O## A combustion reaction takes a hydrocarbon and burns it in oxygen to release carbo...
$10.00 
Waiting for answer 2 specific different reasons why ethanol is used to treat me...
One antidote therapy for methanol ingestion is using ethanol by delaying methanol metabolism until the methanol is eliminated from the patient’s system either naturally or via dialysis. Like methanol, ethanol is metabolized by antidiuretic hormone (ADH) , but the enzyme’s affinity for ethanol is 1...
$10.00 
Waiting for answer How do physical properties of metals differ from nonmetals?
Metals are generally good electrical conductors and good conductors of heat. They are malleable (can be beaten into this sheets) and ductile (can be stretched into thin wires). Most are shiny because the surface electrons are good reflectors of light. Most nonmetals form individual molecules inste...
$10.00 
Waiting for answer How do you calculate the length of an arc and the area of a...
For any ##theta##, the length of the arc is given by the formula (if you work in radians, which you should: The area of the sector is given by the formula ##(theta r^2)/2## Why is this? If you remember, the formula for the perimeter of a circle is ##2pir##. In radians, a full circle is ##2pi##. So...
$10.00 
Waiting for answer What is the radian measure of 72 degrees?
Since ##180^circ=pi## radians, ##72^circ cdot {pi}/{180^circ}={2pi}/5## radians I hope that this was helpful.
$10.00 
Waiting for answer Is evaporation a chemical or physical change?
Evaporation is a physical change it is not a chemical change. It is a physical change because it is going from the liquid phase to the gas phase. It is not a chemical change because...
$10.00 
Waiting for answer What is a sentence that uses the word euphonious?
The singer began their song with a soft, ##color(orange)("euphonious")## hum. The word ##color(orange)("euphonious")## describes sounds or speech as pleasant.
$10.00 
Waiting for answer What does an equilateral triangle look like?
An equilateral triangle is a 3sided polygon (enclosed shape) that whose sides are all congruent (equal in length). An equilateral triangle also has 3 congruent angles, all 60˚ in measure. They look like this: Or, without the ornamentation:
$10.00 
Waiting for answer What is the right hand rule?
The right hand rule is used in Physics to find several properties of conventional current ("flow of positive charge") in terms of magnetic fields. There are two. 1) Right hand rule no. 1 It determines the directions of , conventional current, and the magnetic field. If you are given two of these,...
$10.00 
Waiting for answer One half of a number increased by 16 is four less than two t...
The number is ##color(green)(72)## Let the number be ##n## the number increased by ##16## ##color(white)("XXX")n+16## one half of the number increased by ##16## ##color(white)("XXX...
$10.00 
Waiting for answer Is an endothermic process an example of a physical or chemic...
Endothermic just means that heat has to be supplied to the proces to keep it going. It can be fysical or chemical. Examples of physical : The melting of ice, the evaporation of wate...
$10.00 
Waiting for answer How does a solute differ from a solvent?
is what is being dissolved in a solution, and a does the dissolving. A solution is composed of a solute being dissolved in a solvent. If you have a glass of water with sugar in it the water is the solvent and the sugar is the solute. The solvent is always the larger quantity, as in this example...
$10.00 
Waiting for answer On the cosmic calendar, about when did Earth form?
January 1 big bang. FEBRUARY 11, 2016 BY THREEPOINTEIGHTBILLIONYEARS.COM (3.bp.blogspot.com ) (3.bp.blogspot.com ) On his calendar (dates here are from the Wikipedia version), takes place on January 1, the Milky Way takes shape around March 11, our Sun appears on September 2 with its planets soo...
$10.00 
Waiting for answer What does the word aqueous mean?
Aqueous is a term used to describe a system which involves water. Aqueous is a term used to describe a system which involves water. The word aqueous is also applied to a solution or...
$10.00 
Waiting for answer What is ##sqrt(1/90)##?
##(sqrt 1)/(sqrt90)=(sqrt 10)/(30)## Simplify. ##(sqrt 1)/(sqrt90)## Simplify ##sqrt 1## to ##1##. ##1/(sqrt90)## Factor ##sqrt 90##. ##1/(sqrt (3xx3xx2xx5))## Simplify. ##1/(...
$10.00 
Waiting for answer What is the opposite and reciprocal of 2pi?
opposite of any number is the same number but with opposite sign ∴opposite of ##color(blue)(2pi## is ##color(blue)(−2pi## to generalise, the reciprocal of number ##color(orange)(x##(any number) is ##color(orange)(1/x## here note that the sign of the number does not change at all . so, the recip...
$10.00