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exis [7]
2 years ago
11

what occurs in a chemical reaction? A. Reactants are formed without chemical bonds being broken B. Reactants are formed from pro

ducts by the breaking and forming of bonds C. Products are formed without chemical bonds being broken D. Products are formed from reactants by the breaking and forming of new bonds
Physics
2 answers:
Ann [662]2 years ago
3 0
The answer is D. Products are formed from reactants by the breaking and forming of new bonds. 
tekilochka [14]2 years ago
3 0
The correct answer would be D also
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__________ theory argues that city growth is generated by the pressure from the city center to expand outward. Expansion threate
artcher [175]

Answer: Concentric zone

Explanation:

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2 years ago
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What is the buoyant force on an object that weighs 340 N and is floating on a lake? if you could explain the answer that would b
Kryger [21]

You just said that the object is "floating".  

(As soon as you said that, a picture of a duck flashed through my mind.  But then I knew right away that the duck could not be an accurate representation of the situation you're describing.  340 N would be <u><em>some duck</em></u> ... about 76 pounds ... and that duck would have been caught and eaten a long time ago. I mean ... what could a 76-pound duck do ?  Could it fly away ?  Could it run away ? ?  Not likely.)

So it's not a duck, but whatever it is, it's just sitting there on the water, floating.  What's important is that it's <u><em>not accelerating</em></u> up or down.  THAT tells us that the vertical forces on it are balanced so that there's NO NET vertical force on it at all.

What are the vertical forces on it ?  There's gravity, pulling it DOWN with a force of 340 N, and there's buoyancy, pushing it UP.  The SUM of those two forces must be <em>zero</em> ... otherwise the object would be accelerating up or down.

It's not.  So (gravity) + (buoyancy) must add up to zero.

The buoyant force on the object is <em>340 N UPward.</em>

5 0
3 years ago
For each of the
maksim [4K]

Explanation:

a) Hammer hits a nail

Action: Hammer hitting the nail

Reaction: Nail Hitting the hammer.

B) . Earth's gravity pulls down on a book.

Action: Earth pull downward on the book.

Reaction: The Book pull's the Earth Upward.

C) A helicopter blade pushes  air downward.

Action: Blade push air downward

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3 years ago
Given a force of 100 N and an acceleration of 5 m/s2, what is the mass
UNO [17]

Answer:

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Mass equals force divided by acceleration, so divide 100 N by 5 m/s2 and you get your mass: 20 kg

6 0
2 years ago
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What is one of Kepler's laws of planetary motion?
iragen [17]

Answer:

a. Planets move on elliptical orbits with the Sun at one focus.

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Johannes Kepler was an astronomer who discovered that planets had elliptical orbits in the early 1600s (between 1609 and 1619).

The three (3) laws published by Kepler include;

I. The first law of planetary motion by Kepler states that, all the planets move in elliptical orbits around the Sun at a focus.

II. According to Kepler's second law of planetary motion, the speed of a planet is greatest when it is closest to the Sun.

Thus, the nearer (closer) a planet is to the Sun, the stronger would be the gravitational pull of the sun on the planet and consequently, the faster is the speed of the planet in terms motion.

III. The square of any planetary body's orbital period (P) is directly proportional to the cube of its orbit's semi-major axis.

Hence, one of Kepler's laws of planetary motion states that planets move on elliptical orbits with the Sun at one focus. This is his first law of planetary motion.

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3 years ago
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