PHYSICS MIDDLE SCHOOL

A bulldozer does 45,000 joules of work to push a boulder a distance of 30 meters.How much force is applied to push the?​

Answers

Answer 1
Answer:

Answer:

1500N

Explanation:

we have ,

w= f*d

45,000 =f * 30

f=45000/30

f=1500N..

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A cube is measure 1 cm on each side and has a mass of 2 grams. Will it float on water?

Identify which of the following is a complete and balanced chemical equation

Answers

Answer:

because a complete equation must have all the elements present on the left hand side of the arrow on the right hand side of the arrow as well, and to be balanced there must be the same number of each type of atom, so both A and C are full equations, but A is not balanced because although there are two oxygen atoms on each side of the arrow, there is only one hydrogen atom on the left and two on the right, thus the right hand side is 'heavier' than the left and the equation is unbalanced.

Explanation:

What is the mass of an object whose density is equal to 5 g/ml and has a volume of 7 ml?

Answers

It is a simple cross multiplication:

mass = density x volume
m= 5g/ml x 7 ml
m=35g*ml/ml
m=35g

In 3-5 sentences, use your own words to explain how electricity gets from power plants to our homes.Use the "RAP" method to answer this question:

Restate the question
Answer the question
Prove your answer citing textual evidence from the course.
Don't forget to proofread your answer.

Answers

Answer:

so your wondering how electricity goes from power plants to your home? well, here's why.The electrical charge goes through high-voltage transmission lines that stretch across the country. It reaches a substation, where the voltage is lowered so it can be sent on smaller power lines. It travels through distribution lines to your neighborhood.
Electricity goes from power plants to our homes through a step-down transformer. This helps the voltage to be lowered because electricity has to have high amounts of voltage to travel. So once it’s been lowered, electricity gets transferred to smaller wires that connect to our outlets.

a warm humid and sunny morning changes to stormy weather in the afternoon in the evening it is cool and dry what type of front passed through

Answers

If the morning was humid and sunny, but in the evening, it becomes cool and dry, a cold front has occured.

Which is an example of a physical change* metal rusting
*silver tarnishing
* water boiling
* paper burning

Answers

Water boiling is an example of a physical change. The rest are chemical changes.  
Hope that helps!!

99pts. I can't find isotope, pottasium-15 or k-15. Is this even possible, I have a fill-in-the-blanks worksheet with a table like example:Element Name: Nitrogen-20 Symbol: N-20 Atomic Number: 7 Atomic Mass: 20 Charge: 0 Protons: 7 Neutrons: 13 Electrons: 7

I remember finding the isotope number, Nitrogen-20 by adding the Protons and Neutrons, then I get a new atomic mass. But on here Pottasium-15 is confusing! What neutrons do I add from 19 protons to get 15? Sometimes the teacher throws in impossible problems.

Answers


Yes, that's what [s]he has done this time.

First of all, the number of protons in every atom of an element
is the same.  That's the "Atomic number" of the element.  If
somehow the nucleus of the atom gained or lost a proton, then
that would change the Atomic number of the atom, and it would
be an atom of a different element.

Potassium is element #19.  Every atom of Potassium has 19 protons
in its nucleus.  Any atom that has 19 protons in its nucleus is an atom
of Potassium, and any atom that has more or less than 19 protons in
its nucleus is an atom of some other element, not Potassium.

In addition to protons, atoms also have some neutrons in the
nucleus.  Neutrons have no charge, so they don't change the
atomic number of the atom.  But they have mass ... almost the
same as the mass of a proton ... so the neutrons add to the atom's
"atomic weight".  The atomic weight of an atom is

                       (number of protons) plus (number of neutrons).

The numbers you see next to the names are the atomic weights. 
Notice that the atomic weight of an atom of Potassium can't be
less than 19 ... in order for it to be Potassium in the first place,
it has 19 protons, so its atomic weight would be 19 even if it had
no neutrons at all. 

There can be no such thing as an atom of Potassium-15.

Atoms of the same element can have different numbers of
neutrons in their nucleii.  Those are called "isotopes" of the
element.

There are three isotopes of Potassium that occur in nature ...
atoms with 19 protons plus 20, 21, or 22 neutrons.  So the
atomic weight of any naturally occurring atom of Potassium
is either 39, 40, or 41.   If you ever see a big chart that lists
natural isotopes of the elements, then in slot-#19, you'll see
Potassium-39, Potassium-40, and Potassium-41.

I hope my explanation is good enough for 50 points.

super super late ans but im up late n looking 4 interesting Qs...

Potassium-15 is confusing indeed! What neutrons can one add to a nucleus with 19 protons to get a mass of 15? anti-matter cannot do it as scientists have generally agreed that anti-matter has the same mass as regular matter but with an opposite spin.

the ans actually doesnt exist when the Q was originally asked but in 2017, Washington State University physicists created a fluid with negative mass. so theoretically a "negative neutron" will have a mass of -1. combining 4 of such exotic particles to 19 protons will create K-15; assuming there is no explosion from the combination.
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