All categories

3 years ago

Calculate the heat required to melt 1 g of gold at its melting point. The specific heat of fusion for gold is 64.5×103 J/kg.

Mathematics

1 answer:

Galina-37 [17]3 years ago

5 0

Answer:

64.5J

Step-by-step explanation:

Q = ml

Q = (1/1000)kg X 64.5x10^3 J/kg

Q = 64.5 J

You might be interested in

What is y=4x^2-9x+1 in vertex form

Anna11 [10]

Answer:

$y = 4 \left(x - \dfrac{9}{8} \right)^2 - \dfrac{65}{16}$

Step-by-step explanation:

$y = 4x^2 - 9x + 1$

You need to complete the square on the right side.

$y = (4x^2 - 9x) + 1$

$y = 4(x^2 - \dfrac{9}{4}x) + 1$

$y = 4 \left( x^2 - \dfrac{9}{4}x + \left( \dfrac{9}{8} \right)^2 \right) + 1 - 4\left( \dfrac{9}{8} \right)^2$

$y = 4 \left(x - \dfrac{9}{8} \right)^2 + 1 - 4 \left( \dfrac{81}{64} \right)$

$y = 4 \left(x - \dfrac{9}{8} \right)^2 + 1 - \dfrac{81}{16}$

$y = 4 \left(x - \dfrac{9}{8} \right)^2 + \dfrac{16}{16} - \dfrac{81}{16}$

$y = 4 \left(x - \dfrac{9}{8} \right)^2 - \dfrac{65}{16}$

3 0

3 years ago

hi how are you how do i get the answers for my self because i am a teacher and get just the test with out the answer on them for

Daniel [21]

Well, I saw my teacher solving the test herself, and then grading papers off of her paper that she solved. My teacher made the answer key for the tests.

4 0

3 years ago

Y=−1/2x+3 please guys help

Phantasy [73]

Answer:

-1/2? i dunno

Step-by-step explanation:

5 0

3 years ago

1. Yolanda has a 30%-off coupon from her favorite clothing store. She wants to buy a coat that regularly costs $85.40 How much w

Anit [1.1K]

Answer:

59.78

Step-by-step explanation:

Lol I use the calculator and find the cost of 30 of 85.40 than the number of the percent is 25.62 so I subtract them both and got 59.78 as an answer hope this help

6 0

3 years ago

The quotient of a number and nine is less or equal to fifteen

dimulka [17.4K]

Remark

If you just want the way this would be written out the answer is

$\dfrac{x}{9} \leq 15$

Note

1. The quotient is the answer of a division problem.

2. The number is represented by the letter x

5 0

3 years ago