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Sindrei [870]
3 years ago
7

Why does lowering the temperature of an object increase its density

Physics
1 answer:
Jet001 [13]3 years ago
5 0

Answer: Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.

-ilovejiminssi ✿︎

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If we wish to expand (x + y) 8 , what is the coefficient of x 5 y 3 ? what is the coefficient of x 3 y 5 ?
Molodets [167]
We use the binomial theorem to answer this question. Suppose we have a trinomial (a + b)ⁿ, we can determine any term to be:

[n!/(n-r)!r!] a^(r) b^(n-r)

a.) For x⁵y³, the variables are: x=a and y=b. We already know the exponents of the variables. So, we equate this with the form of the binomial theorem.

r = 5
n - r = 3
Solving for n,
n = 3 + 5 = 8

Therefore, the coefficient is equal to:
Coefficient = n!/(n-r)!r! = 8!/(8-5)!8! = 56

b.) For x³y⁵, the variables are: x=a and y=b. We already know the exponents of the variables. So, we equate this with the form of the binomial theorem.

r = 3
n - r = 5
Solving for n,
n = 5 + 3 = 8

Therefore, the coefficient is equal to:
Coefficient = n!/(n-r)!r! = 8!/(8-3)!8! = 56
7 0
3 years ago
A ball with a mass of 500g is lifted to a shelf 2 meter above ground. Calculate for the gravitational potential energy gained by
wariber [46]

Givens

  • 500 grams = 500 grams * [1 kg/1000 grams] = 0.5 kg
  • h = 2 meters
  • g = 9.81

Formula

PE = m*g*h

Solution

PE = 0.5 * 9.81 * 2

PE = 9.81 Joules


7 0
3 years ago
Which of the following is a physical property of water?
photoshop1234 [79]
Hi there!

First of all, you have to pay attention to the question, and they are asking for something physical, and physical means to be seen on the outside.

The answer is A because you can clearly see that water is a liquid. Being a liquid is a physical property.

It wouldn't be B because I believe it would be a chemical property to react with many substances.

Hope this helps! :D
7 0
3 years ago
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Q: A: Sarah and Maria made a telephone using two cans and a string. It was a very long string. Maria went upstairs in her house
GrogVix [38]
This contraption is a lot of fun, and you really should try it
some time.

The sound waves move from one can to the other one 
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3 0
4 years ago
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Compare a circuit with a river. Which of the following makes a good analogy to a load?
Aneli [31]
A waterwheelis the answer pls thank me
5 0
4 years ago
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