PHYSICS MIDDLE SCHOOL

An ice cube melts when its mechanical energy increases.

Answers

Answer 1
Answer: false it only melts when its thermal energy increases. plus an ice cube has no mechanical energy.
Answer 2
Answer:

Answer:

False!

Explanation:

Related Questions

David hops in his 600-kg dune buggy and travels 20 m/s to the east.  Meanwhile, Serap drives her 500-kg dune buggy at 30 m/s east and tries to catch David.What is davids momentum?what is serap's momentumwhat is the total momentum of the entire system?​
A group of students is measuring the change in momentum of an object. Which set of lab equipment would be most useful in measuring the momentum of an object?
A spoon can sound like a bell. Explain scientifically in detail.
When using the right-hand rule to determine the direction of the magnetic field around a current-carrying wire, which part of theright hand points in the direction of the magnetic field?-palm-fingers-back-thumb
Why does a balloon filled with helium rise while a balloon filled with an equal volume of average atmospheric air does not?A.Helium has no mass, but air does. B.Helium increases the balloon's mass more than air. C.Helium has a higher density than air. D.Helium has a lower density than air.

Explain how gravitational, electrical, and magnetic forces act on a maglev train

Answers

Gravity keeps it on the tracks magnetic force hopes to run smoothly and electricity helps it to run

A pair of speakers on two sides of a stage are playing identical pure tones. When you stand in the center, equally distant from the two speakers, you hear the sound loud and clear. Why does the intensity of the sound diminish considerable when you step off to one side?

Answers

Answer is This is because of the interference of sound waves. Due to distractive interference, intensity diminishes when we step to one side.
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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.

When car tires are on hot pavement for too long, the pressure inside will ___________ and the volume within the tire will _____________. A) increase; decrease due to deflation B) decrease; remain unchanged C) increase; increase and possibly result in a blowout D) increase; remain unchanged as long as the temperature is constantly rising

Answers

When the car is driven at high speed for a long time on rough pavement,
the tires and the air inside them heat up. 

That causes the air pressure inside the tires to increase, and the increased
pressure tries to make the tires bigger (they ARE made of rubber, after all).

Normally, the tires do expand a little.  But if this goes on for too long, or
if there's a weak spot on the tire, a blowout is possible.

The anwser is c make sure you read the anwser before me.

Your shopping cart has mass of 65 kg. In order of accelerate the shopping cart down an aisle at 0.3 m/sec^2, what force would you need to use or apply to the cart?

Answers

Fnet = m x a
= 65kg x 0.3m/s^2
= 19.5N
This is assuming that there is no friction or other external forces!

What kind of telescope uses only lenses?

Answers

A refracting telescope is a type of optical telescope that uses a lens as its objective to form an image.

What is a telescope?

Astronomers use a telescope to observe distant things. Curved mirrors are used by the majority of telescopes, including all large telescopes, to collect and concentrate light from the night sky.

Refracting telescopes have been used for centuries and are still commonly used today, especially for viewing bright objects such as the Moon and planets.

However, they have some limitations compared to other types of telescopes, such as difficulty in making large lenses without distortion and the tendency to produce chromatic aberration, which can cause images to appear blurred or discolored.

Despite these limitations, refracting telescopes remain popular among amateur astronomers and are still used in many scientific applications.

Learn more about telescopes here:

brainly.com/question/556195

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Refracting telescope
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