explain why solar eclipses do not occur every time the moon revolves around earth

The velocity of the ball is zero at the point of release.

Thus the ball have the least kinetic energy just after it is released.

The energy of the object due to its motion is known as the kinetic energy of that object.

As the ball has some height before it is dropped.

Due to this height the ball posse some potential energy which is equal to the product of its mass, height and the gravitational force.Here kinetic energy is zero.

Hence the ball have the least kinetic energy just after it is released.

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Answer: After it has hit the ground

Explanation:

I took the K12 test and got it right leave brainliest

Answer:

What is a Pure Substance?

Explanation:

It is something which cannot be divided into parts by physical means, as it's all made up of the same thing. Pure substances are either elements or compounds. Elements can NOT be separated into other types of matter (physically or chemically).

Answer:

an element

Explanation:

Elements are not able to be separated, but everything else can, whether that be physically or chemically.

Not my work i looked it up, so no copy write please rate!

Final answer:

The incorrect statement about the nuclear strong force is that it is responsible for the sun's nuclear fission reactions. In reality, the strong force is crucial for binding nucleons within nuclei and operates over extremely short distances, but it is not responsible for fission in the sun.

Explanation:

The statement about the nuclear strong force that is not true is: The nuclear strong force is responsible for the sun’s nuclear fission reactions. This is incorrect because the strong force is not responsible for fission in the sun; instead, it plays a crucial role in maintaining the stability of atomic nuclei by binding protons and neutrons together. It is a powerful attractive force that acts over extremely short distances, approximately 10-15 meters, and is much stronger than electrostatic repulsions between similarly charged protons. However, its primary role is not in driving the sun's fission reactions, but in the fusion processes that occur in stars, including our sun.

The correct statements regarding the nuclear strong force are:

Answer:

8.4375m a second

Explanation:

Again, this is such an easy question that I see everywhere. The way to figure this out is to divided the total distance he or she covered, which was 27m, by the time it took him or her to do so, which was 3.2s, so the equation is 27 divded by 3.2 which is 8.4375.

Hope this helps and have a great day.

Answer:

8.44 m/s

Explanation:

Averag v = distance/time

= 27m/3.2s

= 8.44 m/secs

Answer:

I believe there are 20 Neutrons in Calcium.

Explanation:

Final answer:

Calcium has several isotopes, with calcium-40 being the most common and containing 20 neutrons. The number of neutrons in an isotope of calcium can be found by subtracting the atomic number (20) from its mass number. Other isotopes like calcium-48 contain 28 neutrons.

Explanation:

To determine how many neutrons are in calcium, we look at its atomic number (Z) and its mass number (A). Calcium's atomic number is 20, which means it has 20 protons.

The most common isotope of calcium is calcium-40, which has a mass number of 40. To find the number of neutrons, we subtract the atomic number from the mass number:

Neutrons = Mass number - Atomic number = 40 - 20 = 20 neutrons

Therefore, calcium-40 contains 20 neutrons. There are other isotopes of calcium as well, such as calcium-48, which has 28 neutrons, and it is characterized by a half-life of about 2×10¹⁶ years, making it relatively stable.

When calcium forms a cation, such as Ca²⁺, it still retains its 20 protons and the number of neutrons does not change due to electron gain or loss. The resulting ion would have 18 electrons and carry a +2 charge.

The horizontal range of the missile is b) 176 m

Explanation:

The motion of the missile is a projectile motion, so it consists of two independent motions:  

- A uniform motion with constant velocity along the horizontal direction  

- A uniformly accelerated motion with constant acceleration (equal to the acceleration of gravity) in the vertical-downward direction  

To find the time of flight of the missile, we study the vertical motion. We can use the following suvat equation:

[tex]s=u_y t+\frac{1}{2}at^2[/tex]

where:

s = 75 m is the vertical displacement of the missile (the height of the building)

[tex]u_y=0[/tex] is the initial vertical velocity  (the missile is thrown horizontally)

t is the time of flight

[tex]a=g=9.8 m/s^2[/tex] is the acceleration of gravity

Solving for t, we find the time of flight:

[tex]t=\sqrt{\frac{2s}{g}}=\sqrt{\frac{2(75)}{9.8}}=3.91 s[/tex]

This means that the missile takes 3.91 s to reach the ground.

Now we study the horizontal motion: the missile moves with a constant horizontal velocity of

[tex]v_x = 45 m/s[/tex]

Therefore, the distance covered in a time t is

[tex]d=v_x t[/tex]

and by substituting t = 3.91 s, we find the horizontal range of the missile:

[tex]d=(45)(3.91)=176 m[/tex]

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Answer:

A

Explanation:

Answer:

C: Chemical

Hope this help !!!!

C. Chemical

~Sarah Robinsen

Answer:

Force B

Explanation:

Friction Force

It's a force that appears when an object is tried to move on a rough surface. There are two cases: when the object is at rest, we have the friction static coefficient and when the object is already moving, we have the dynamic coefficient. The static coefficient is usually greater than the second because it's harder to overcome the friction when the object is at rest.

We are told that John pushes the bed to the left with enough force to overcome the force of friction. If the movement is intended to be to the left side, the friction force appears to the right, since it always opposes to the movement. Thus the force B is the one who represents the friction force in this situation

No, the speed at which an object falls is not equal to the acceleration at which it falls.

Answer:

Option B

Explanation:

Speed is defined as how fast an object can cover a specific distance and in what time it covers. So it is measured as the ratio of distance covered to the time taken to cover that distance. While acceleration is the rate of change of velocity. Moreover, speed is a scalar quantity and acceleration is a vector quantity. So most of the times, the direction will play an important role in the varying values of speed and acceleration. Also, acceleration of an object will depend upon the force and mass of the object. Thus, speed and acceleration will not attain same value always.

Answer:

Statics which is when dealing with forces acting out on body and the possible motives of the body system. Kinetics which explains the motion that can occur in any type of situation.

Explanation:

Answer:

Acceleration

Explanation:

can you mark me  brainlies

So, if an object travels in a curved path, it changes velocity, and, thus, accelerates. This acceleration must be tied to a force. ... Therefore, whenever an object travels in a curved path, there must be an unbalanced force acting upon it. It is important to understand that all this may occur without a change in speed.t

The answer from the given option is The mean study time of students in class B is less than the students in class A.

Explanation:

There are three types of mean:

Here in class A,  

  Mean in class A = (2+5+7+6+4+3+8+7+4+5+7+6+3+5+4+2+4+6+3+5) / 20

                                = 4.8.

  Mean in class B = (3+7+6+4+3+2+4+5+6+7+2+2+2+3+4+5+2+2+5+6) / 20

                                = 4.

Hence mean study time of class B is less than the mean study time of class A.

Answer:

False

Explanation:

A book resting on a shelf has no potential energy relative to the shelf, since it has height of zero meters relative to the shelf.

Answer:

True

Explanation:

Answer:

A horizontal line means the object is not changing its position - it is not moving, it is at rest. • A downward sloping line means the object is returning to the start. SPEED-TIME GRAPHS. Speed-Time graphs are also called Velocity Time graphs.

Explanation:

Answer: The object is moving in a constant speed.

Explanation: In a distance time graph a horizontal line indicates a zero slope which means the object maintains a constant speed in motion. Rising slope an increase in speed and a slope going down indicates a decrease in speed.

A) Acceleration in part A: [tex]6.1 m/s^2[/tex]

B) Acceleration in part B: [tex]2.7 m/s^2[/tex]

C) Acceleration in part C: [tex]1.5 m/s^2[/tex]

Explanation:

A)

The picture of the problem is missing: find it in attachment.

The acceleration of a body is equal to the rate of change of its velocity:

[tex]a=\frac{v-u}{\Delta t}[/tex]

where

v is the final velocity

u is the initial velocity

[tex]\Delta t[/tex] is the time it takes for the velocity to change from u to v

In part A of the race, we have:

u = 0

v = 5.5 m/s (estimate)

[tex]\Delta t = 0.9 - 0 = 0.9 s[/tex]

So the acceleration is

[tex]a=\frac{5.5-0}{0.9}=6.1 m/s^2[/tex]

B)

In part B of the race, we have:

u = 5.5 m/s is the initial velocity (estimate)

v = 9.5 m/s is the final velocity (estimate)

[tex]\Delta t = 2.4 - 0.9 = 1.5 s[/tex] is the time interval between the two points considered

Therefore, using the equation for the acceleration, we can find the acceleration in part B:

[tex]a=\frac{9.5-5.5}{1.5}=2.7 m/s^2[/tex]

C)

In part C of the race, we have:

u = 9.5 m/s is the initial velocity (estimate)

v = 11 m/s is the final velocity (estimate)

[tex]\Delta t = 3.4 - 2.4 = 1 s[/tex] is the time interval between the two points considered

And therefore, the acceleration in part C of the race is:

[tex]a=\frac{11-9.5}{1}=1.5 m/s^2[/tex]

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Answer:

so that they don't calch fire

Answer:

A.)

Explanation:

The answer would be A. because when they are burned, they release harmful pollution into the air causing the environment to be polluted by them.

It can't be B because it is saying the opposite which is false.

It is not C because solar power is a renewable resource not non-renewable like the question asked.

It is also not D because a non-renewable resource is one that cannot be replaced but this is saying that they can be replaced which is incorrect.

The answer would be A.

Explanation:

Energy

It is ability to do work

It is of different types out of which mechanical energy is also one of the type .

Mechanical energy

It is the energy possessed by body due to its position or motion .

It is of two types :

Kinetic energy

Potential energy

Potential energy

It is the energy possessed by body due to its position or state .

It is given by P.E =mx gx h

Kinetic energy

It is the energy possessed by body due to its motion .

It is given by K.E=1/2 mv²

Law of conservation of energy

It states that energy can be converted from one form to another but total energy of the system remains same .

That is why : in above asked question ,when body is moving it has kinetic energy , when stops the kinetic energy gets converted to potential energy , but the total energy of system remains same .

The object's kinetic energy would decrease, its potential energy would increase, and its total mechanical energy would remain the same.

The total mechanical energy (E) of a system is the sum of its kinetic energy (KE) and its potential energy (PE).

E = KE+ PE

conservation of energy:

whenever an object is acted upon by a non-dissipative conservative force its total mechanical energy remains conserved.

So, when the object slows down, its velocity decreases, and therefore its kinetic energy decreases. Since the total mechanical energy remains conserved, the loss in kinetic energy is converted into gain in potential energy, and the potential energy increases.

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a) Distance moved by the top lid during a blink: 1 cm (estimate)

b) The acceleration is [tex]34.7 m/s^2[/tex]

c) The final speed is 0.83 m/s

Explanation:

a)

For the purpose of this problem, we can estimate the size of the eye from the top lid to the bottom lid to be 1 cm, so this is the distance moved by the top lid during a blink.

b)

Assuming the motion of the eyelid to be at constant acceleration, we can find the acceleration by using the following suvat equation:

[tex]s=ut+\frac{1}{2}at^2[/tex]

where

s is the distance covered

u is the initial velocity

t is the time

a is the acceleration

For the eyelid, we have:

u = 0 (it starts from rest)

s = 1 cm = 0.01 m is the distance covered

t = 0.024 s is the time taken

Solving for a, we find the acceleration:

[tex]a=\frac{2s}{t^2}=\frac{2(0.01)}{0.024^2}=34.7 m/s^2[/tex]

c)

The final speed of the upper eyelid can be found by using another suvat equation:

[tex]v=u+at[/tex]

where

v is the final speed

u is the initial speed

a is the acceleration

t is the time

For the eyelid in this problem, we have

u = 0

[tex]a=34.7 m/s^2[/tex]

t = 0.024 s

Substituting, we find the final speed:

[tex]v=0+(34.7)(0.024)=0.83 m/s[/tex]

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Answer:

Thermal physics is the combined study of thermodynamics, statistical mechanics, and kinetic theory of gases. This umbrella-subject is typically designed for physics students and functions to provide a general introduction to each of three core heat-related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics.

Explanation:

Final answer:

Thermal physics is a branch of physics focused on energy transfer and the behavior of particles in relation to heat, including study areas like thermochemistry and thermodynamics. It encompasses thermal agitation, heat transfer, and laws of energy conservation.

Explanation:

Thermal physics is an area of physics that deals with the energy transfer, thermal properties of materials, and the behavior of particles related to heat. It encompasses topics such as thermochemistry, the laws of thermodynamics, and thermal agitation. Thermal agitation refers to the random motion of atoms and molecules in any object with a temperature above absolute zero, resulting in the emission and absorption of radiation. In essence, thermal physics explores how thermal energy, or the kinetic energy of particles, flows and changes within systems. Thermal energy is a form of kinetic energy at the microscopic scale, crucial in understanding heat transfer, and how it influences work and energy conservation.

At the macroscopic level, thermal physics analyzes how heat transfer affects the internal energy of systems, aligning with Big Ideas from the AP Physics Curriculum Framework. Heat transfer describes energy movement from a hotter object to a cooler one, leading to temperature variations and potential work, exemplified by heat engines. Fundamental laws of physics, including the law of conservation of energy, govern these thermal interactions and their efficiencies.

Answer:

1.53 m/s

Explanation:

Given:

Mass of the car (M) = 1300 kg

Mass of the coal (m) = 400 kg

Initial velocity of the car (U) = 2 m/s

Initial velocity of the coal (u) = 0 m/s (Since it is dropped)

When the coal is dropped into the car, then they move with same final velocity.

Let the final velocity be 'v' m/s.

For a closed system, the law of conservation of momentum holds true.

So, initial momentum is equal to final momentum of the car-coal system.

Initial momentum of the car = [tex]MU=1300\times 2=2600\ Ns[/tex]

Initial momentum of the coal = [tex]mu=0\ Ns[/tex]

Total initial momentum is the sum of the above two momentums.

So, total initial momentum = 2600 + 0 = 2600 Ns

Now, final momentum is given as the product of combined mass and final velocity. So,

Final momentum of the system = [tex](M+m)v=(1300+400)v=1700v[/tex]

Now, from law of conservation of momentum,

Initial momentum = Final momentum

[tex]2600=1700v\\\\v=\frac{2600}{1700}\\\\v=1.53\ m/s[/tex]

Therefore, the final velocity of either of the two masses is same is equal to 1.53 m/s.

To find the final velocity of the car after the coal is dropped, we can use the principle of conservation of momentum.

To solve this problem, we can use the principle of conservation of momentum. The momentum before the coal is dropped vertically into the car is given by the product of the mass and velocity of the car, which is 1,300 kg×2.0 m/s = 2,600 kg×m/s. After the coal is dropped, the total momentum of the system should remain the same since there is no external force acting on it. Therefore, the final velocity of the car can be calculated by dividing the total momentum by the new total mass of the car and coal, which is 1,300 kg + 400 kg = 1,700 kg.

Using the equation:

(initial momentum) = (final momentum)

(1,300 kg × 2.0 m/s) = (1,700 kg × v)

Solving for v, we find that the final velocity of the car after the coal is dropped is approximately 1.529 m/s.

Answer:

b

Explanation:

The main idea can be the Role of Heat Transfer Methods in the Distribution of Earth's Energy.

The main idea of a passage is the central message or information the author is trying to pass to the audience.

The main idea of a passage is the author's main purpose of writing the passage.

From the given options, the main idea of the passage can be determined if the central message of the passage can be deduced.

The main idea can be "The Role of Heat Transfer Methods in the Distribution of Earth's Energy"

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Answer:

V= 250 volts

Explanation:

V=IR

V=25*10

V=250 volts

Answer: 250 V

Explanation: Ohm's Law is expressed in the given equation:

V = I x R

Substitute the values of I ( current) and R ( resistance)

V = 25 A x 10 ohms

= 250 V

Answer: 12000 kg m/s

Explanation:

According to the Impulse-Momentum Theorem, we have:

[tex]F \Delta t= \Delta p[/tex]

Where:

[tex]F=3000 N[/tex] is the exerted force

[tex]\Delta t=4 s[/tex] is the time interval

[tex] \Delta p[/tex] is the change in momentum or impulse

Then:

[tex](3000 N)(4 s)= \Delta p[/tex]

[tex]\Delta p=12000 kg m/s[/tex]  This is the impulse impacted on the object

Answer:

poor diet andlack of exersise

Explanation:

Answer:

(a) 4070 N

(b) 9.95 m/s

Explanation:

(a) Draw a free body diagram of the stunt man when he is at the top of the loop.  There are two forces: normal force N pushing down and weight force mg pulling down.

Sum of forces in the radial (-y) direction:

∑F = ma

N + mg = m v² / r

N = m v² / r − mg

N = (101 kg) (22.5 m/s)² / (10.1 m) − (101 kg) (9.8 m/s²)

N = 4070 N

(b) At the minimum speed, there is no normal force at the top of the loop.

∑F = ma

mg = m v² / r

g = v² / r

v = √(gr)

v = √(9.8 m/s² × 10.1 m)

v = 9.95 m/s

Answer:

At momentum zero, kinetic energy = zero

At momentum 10, kinetic energy can never be equal to zero.

Explanation:

An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.