1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
yawa3891 [41]
3 years ago
13

In 1665 Sir Isaac Newton proposed the fundamental law of gravitation as a universal force of attraction between any two bodies.

What does this theory state about the force that makes an apple fall and the force that keeps the moon in its orbit?
Physics
2 answers:
Wittaler [7]3 years ago
6 0
Cause of the graventation rings around earth it keeps the moon from going anywhere
katrin [286]3 years ago
6 0

Explanation:

According to Newton's law of gravitation, the force of attraction acting between the objects is directly proportional to the product of the masses of the objects and is inversely proportional to the square of the distance between them.

Every particles attracts every other particles in the Universe according to Newton's law of gravitation. This is due to the gravitational force acting between the objects.

The force of gravitation depends on the masses on the objects. The mass of the earth is larger than the apple. Then, an apple will fall on the earth.

An apple falls on the earth due to the force of gravitation between an apple and the earth.

The mass of the earth is larger than the moon. The force of gravitation is responsible to keep the moons in its orbits. It is balanced by the centripetal force. Otherwise, the moon will fall on the earth.

You might be interested in
A 1500 kg car has an applied forward force of 5000 N and experiences an air resistance of 1250 N. What is the car's acceleration
marshall27 [118]

Answer:

2.33\ m/s^2

Explanation:

<u>Net Force </u>

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

Fn = m.a

Where a is the acceleration of the object.  The net force is the sum of the individual vector forces applied to the object.

The m=1500 Kg car has two horizontal forces applied: the forward force of 5000 N that causes the movement and the air resistance force of 1250 N that opposes motion.

The net force is Fn = 5000 N - 1500 N = 3500 N

To find the acceleration, we solve the equation for a:

\displaystyle a=\frac{Fn}{m}

\displaystyle a=\frac{3500}{1500}

\boxed{a = 2.33\ m/s^2}

The car's acceleration is a = 2.33\ m/s^2

8 0
2 years ago
Why does the gravitational force between earth and moon predominate over electrical forces?
nadezda [96]

Answer:

Because the Earth and the Moon are electrically neutral

Explanation:

The gravitational force between the Earth and the Moon is given by

F=G\frac{mM}{r^2}

where G is the gravitational constant, m is the mass of the Moon, M is the mass of the Earth, r is the distance between the Moon and the Earth. Since both the Earth and the Moon have large masses, m and M are big, so the gravitational force between the two objects is large.

On the contrary, the electrostatic force between the Earth and the Moon is given by

F=k\frac{q_1 q_2}{r^2}

where k is the Coulomb's constant, q1 is the charge of the Moon, q2 is the charge of the Earth, r is the distance between the Moon and the Earth. However, big objects (and planets as well) are electrically neutral, which means that they have zero charge (because if they had charge, they would tend to attract charge of the opposite sign, becoming neutral again). Therefore, the values of q1 and q2 are approximately zero, so the electrostatic force is zero as well.

4 0
3 years ago
A 15.0 cm object is 12.0 cm from a convex mirror that has a focal length of -6.0 cm. What is the height of the image produced by
alisha [4.7K]
<h2>Answer: 5 cm</h2>

In convex mirrors the focus is virtual and the focal distance is negative. This is how the reflected rays diverge and only their extensions are cut at a point on the main axis, resulting in a virtual image of the real object .

The Mirror equation is:  

\frac{1}{f}=\frac{1}{u}+\frac{1}{v}    (1)  

Where:  

f=-6cm is the focal distance  

u=12cm is the distance between the object and the mirror  

v is the distance between the image and the mirror

We already know the values of f and u, let's find v from (1):  

v=\frac{u.f}{u-f}    (2)  

v=\frac{(12cm)(-6cm)}{12cm-(-6cm)}

v=-4cm   (3)

On the other hand, the magnification m of the image is given by the following equations:  

m=-\frac{v}{u}   (4)

m=\frac{h_{i}}{h_{o}}   (5)

Where:

h_{i} is the image height  

h_{o}=15cm is the object height

Now, if we want to find the image height, we firstlu have to find m from (4), substitute it on (5) and find h_{i}:

Substituting  (3) in (4):

m=-\frac{-4cm}{12cm}  

m=\frac{1}{3}    (6)

Substituting  (6) in (5):

\frac{1}{3}=\frac{h_{i}}{15cm}

h_{i}=\frac{15cm}{3}

Finally we obtain the value of the height of the image produced by the mirror:

h_{i}=5cm

6 0
3 years ago
Read 2 more answers
When doing a squat, how do you do it without getting hurt?
Aleksandr [31]
I do weight lifting so you need feet flat on floor but out back straight and also a spotter
7 0
3 years ago
Read 2 more answers
A cord of negligible mass runs around two massless, frictionless pulleys. A canister with mass m = 20 kg hangs from one pulley.
photoshop1234 [79]

(a) 196 N

The equation of the forces on the side of the cord where the force F is applied is:

F-T=0 (1)

where T is the tension in the cord.

On the other side of the cord, the equation of the forces on the canister is

T-mg = ma (2)

where

m = 20 kg is the mass of the canister

g=9.8 m/s^2 is the acceleration of gravity

a is the acceleration

From (1),

T=F

Substituting into (2),

F-mg = ma\\F=m(g+a)

We want the canister to move at constant speed, so

a = 0

And therefore:

F=mg=(20)(9.8)=196 N

b) 2.0 cm

The cord is inextensible, this means that the acceleration of its parts are the same. Therefore, the acceleration of the free end must be the same as the acceleration of the canister: and this means that the two parts also cover the same distance in the same time.

Therefore, the free end of the cord must be moved exactly the same as the canister, by 2.0 cm.

c) 3.92 J, the same

The work done by the tension in the cord is

W_T = T d

where

T is the tension

d = 2.0 cm = 0.02 m is the displacement

As we said in part (a), the tension in the cord is equal to the force applied to the free end:

T = F

So

T = 196 N

Therefore, the work done by the tension is

W=(196)(0.02)=3.92 J

And since the force applied (F) is the same, then the work done by you when pulling the cord is exactly the same.

(d) -3.92 J

The weight of the canister is

F_g = mg =(20 kg)(9.8 m/s^2)=196 N

However, the direction of the force of gravity is opposite to the displacement. Therefore, the work done by gravity is negative:

W_g = - F_g d

And substituting,

W_g=-(196)(0.02)=-3.92 J

(e) Zero

The net work done on the canister can be simply calculated by adding the work done by the tension in the cord and the weight of the canister:

W=W_T+W_g = 3.92 + (-3.92 ) = 0

This is in agreement with the work-energy theorem, which states that the work done on an object is equal to its change in kinetic energy. In this situation, the canister is moving at constant speed, so its kinetic energy is not change: therefore,

\Delta K = 0 (change in kinetic energy = 0)

and so, the work done on it is also zero.

(f) The pulley system changes the direction of the force applied

This is a simple pulley system, which means  that the system does not multiply the force applied in input. In fact, the mechanical advantage of the system is

MA=\frac{F_{out}}{F_{in}}

where:

F_{out} is the output force, which is the weight of the canister

F_{in} is the force in input, which is F

So, the mechanical advantage is 1:

MA=\frac{196 N}{196 N}=1

From a point of view of energy, therefore, there is no advantage in this system.

However, the advantage offered by the pulley system concerns the direction of the force: in fact, it changes the direction of the applied force (which is F, downward) into the tension of the cord (which is upward on the canister).

6 0
3 years ago
Other questions:
  • A long cylindrical rod of diameter 200 mm with thermal conductivity of 0.5 W/m⋅K experiences uniform volumetric heat generation
    15·1 answer
  • For line graphs and bar graphs, the values measured by the _____ axis depend on the values measured by the horizontal axis.
    9·1 answer
  • According to Newton’s Third Law of Motion, how are action and reaction forces related. Provide a full explanation with an exampl
    13·1 answer
  • A plane takes 4 hrs to fly 4200 km. What was the plane's velocity in km/hr?
    8·1 answer
  • Suppose you are asked to find the area of a rectangle that is 2.1-cm wide by 5.6-cm long. Your calculator answer would be 11.76
    10·1 answer
  • An inductor is connected in series to a fully charged capacitor. which of the following statements are true?
    7·1 answer
  • A ball is throw at an angle of 30 degrees off the horizontal, with an initial velocity of 28 m/s. what is the maximum height the
    5·1 answer
  • When forklift moves a crate, it performs _______.
    12·2 answers
  • A car starts from the rest and retains the acceleration of 4m/S2 in 20 second.calculate its final velocity​
    10·1 answer
  • Which of these is NOT one of the 3 Bs of light you learned about in this lesson?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!