# Question #d5fe2

##### 1 Answer

#### Answer:

You need

#### Explanation:

Start by taking a look at sand's *specific heat*, which is said to be equal to

When given in Joules per kilogram Kelvin, the specific heat of a substance tells you how much heat is required to increase the temperature of

In your case, if you add

Since you need to increase its temperature by **20 times more heat** than you would have supplied to increase the temperature by only

The equation that links added/removed heat to increase/decrease in temperature looks like this

#q = m * c * DeltaT" "# , where

So, use the value given to yout to find

#q = 1color(red)(cancel(color(black)("kg"))) * 664"J"/(color(red)(cancel(color(black)("kg"))) * color(red)(cancel(color(black)(""^@"C")))) * (50-30)color(red)(cancel(color(black)(""^@"C")))#

#q = "13,280 J" = color(green)("10,000 J")#

The answer is rounded to one sig fig, the number of sig figs you gave for the mass of the sample.