PHYSICS MIDDLE SCHOOL

Newton’s Third Law of Motion states that when one object exerts a force on a second object, the forces are __________________. A.
equal in magnitude and equal in direction





B.
equal in magnitude and opposite in direction





C.
opposite in magnitude and equal in direction





D.
opposite in magnitude and opposite in direction

Answers

Answer 1
Answer: b. equal in magnitude and opposite in direction
Answer 2
Answer:

the answer of the question is A

Related Questions

A baseball falling toward a player's glove gains _____ energy and loses _____ energy. A. potential; kinetic B. kinetic; potential C. kinetic; chemical D. chemical; potential
What is the name for the force that pushes electrons along in a circuit?
Which statement is true of magnets?a. Elecromagnets are generally weaker than permanent magnets.b. Earth is an electromagnet.c. A magnet always has a north pol, and may or may not also have a south pole.d. Permanent magnets can be turned off.
What is the force of gravity (from the Earth) on the 700kg satellite if it’s 10km above the Earth's surface?
contrast the force of gravity between these pairs of objects: 1-kg mass and a 2-kg mass that are 1 m apart; a 1-kg mass and a 2-kg mass that are 2 m apart; and two 2=kg masses that are 1 m apart. helpppppp i dont understand.

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.

The movement of deep ocean currents is mainly caused by:?

Answers

The relationship between the density of ocean water and the formation of deep currents. Difference in the tempature and salinity and the resulting differences in density cause variations int he movement of deep currents. For example, the deepest current , The Antarctic Bottom Water, is denser than the North Atlantic Deep Water. Both currents spread across the ocean floor as they flow toward eachother. Because less dense water always flows on top of denser water, The north Atlantic Deep Water flows on top of the Atlantic Bottom Water when the currents meet.

A rock is dropped from a height of 2.5 meters. What is its velocity when it reaches the ground?

Answers

Answer:

The velocity of the rock when it reaches the ground is

7

m

s

.

Explanation:

The formula we are using is

V

2

2

=

V

2

1

+

2

a

Δ

d

=> Where

V

is the velocity in

m

s

.

=> Where

a

is acceleration in

m

s

2

.

=> Where

Δ

d

is the change in displacement in

m

.

So now we just plug in the numbers.

V

2

2

=

V

2

1

+

2

a

Δ

d

=

0

+

2

(

9.8

)

(

2.5

)

=

√

49

=

7

The velocity of the rock when it reaches the ground is

7

m

s

.

Help please I can't do these !!!!You throw a rock off the top of a building located on the Planet Mars with an initial velocity of10.0 m/s. The force of gravity on Mars is ⅓ that of Earth. It takes 12.0 s to hit the ground. How tall is the building?


You shot a gun straight up into the air with a velocity of 500 m/s. How long will it take beforeit hits the ground again?


You shoot a gun with a initial velocity of 500 m/s horizontally at the exact instant you drop arock from exactly the same height (at 1.6 m off of the ground). Which one will hit the ground first.

Answers

1) G.mars= 9.8x(1/3)=3.26
Vi=10 m/s , T=12 sec
Dis. = Vi(t)+1/2(g)(t)^2
(10)(12)+1/2(3.26)(12)^2= 354.72
2)V=500 m/s
Hmax= v^/2(g) = 500^2/2(9.8) = 12755.1

Since the ball slowly comes to a stop what does this mean about the net force on the ball as it rolls across the field?

Answers

Since the speed of the bll is decreasing, there must be a net force
acting on it in the direction opposite to its motion.

Why does an object traveling in a circle at a constant speed always accelerate ?

Answers

Because "acceleration" doesn't mean "speeding up".  It means any change
in the speed or direction of motion.

An airplane speeding up, a bicycle slowing down, and a car going around a curve, are all doing accelerated motion.

A circle has no straight parts, so an object traveling in a circle is always changing
its direction. That means accelerated motion, even if its speed doesn't change..
I'm not sure but I believe it is momentum, when an object keeps moving and keeps Its speed 
Other Questions
In the equation (v2 - v1)a=_______t what does v1 and v2 represent
If a star's parallax angle is too small to measure, what can you conclude about the star's distance from the Earth?
What is the most important reason that caffeine (C8H10N4O2) has a lower melting point than copper (II) chloride (CuCl2)?A. The intermolecular forces holding the caffeine molecules together are weaker than the ionic bonds in CuCl2.B. The heavy caffeine molecules are more likely to fall apart than the lighter CuCl2 molecules.C. The metallic bonds in copper chloride are stronger than the ionic bonds in caffeine.D. Caffeine is a network solid and has a low melting point like other network solids.
What is same about all myriapods