Which idea did Ptolemy’s model use to explain why the planets appeared to move backward as they moved in their orbits?

The planets spun in epicycles.
The planets rotated on their axes.
The planets revolved around the Sun.
The planets were made of different materials.

Answer:

It's Laws of Motion

Explanation:

Answer:

Rough surfaces have more microscopic hills and valleys than smooth surfaces do. So, the rougher the surface is, the greater the friction is.

Answer:

Materials can be classified based on the amount of light they transmit. Materials, which allow complete transmission of light, are called transparent. Any object can be seen through a transparent material. One example of transparent material is pure glass.

Explanation:

Does this help ?

Answer:

light, materials, and shadows

Explanation:

hope this helps have a good rest of your day :) sorry if incorrect

Answer:

Nuclear energy

Explanation:

The nucleus holds the energy together

Answer:

air

Explanation:

Water bodies are already found on the Earth's surface made up of soil which is part of the lithosphere

Answer:

I am pretty sure that it is one

Answer:

Explanation: is 1

Answer:

[tex]a=16\ m/s^2[/tex]

Explanation:

Motion With Constant Acceleration

It's a type of motion in which the velocity of an object changes uniformly in time.

The formula to calculate the change of velocities is:

[tex]v_f=v_o+at[/tex]

Where:

a   = acceleration

vo = initial speed

vf  = final speed

t    = time

The roller coaster moves from vo=6 m/s to vf=70 m/s in t=4 seconds. To calculate the acceleration, solve for a:

[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]

[tex]\displaystyle a=\frac{70-6}{4}=\frac{64}{4}[/tex]

[tex]\boxed{a=16\ m/s^2}[/tex]

Answer:

32.32857

Explanation:

Searched on the web

Answer:

203.1J

Explanation:

Given parameters:

Mass  = 65kg

Speed  = 2.5m/s

Unknown:

Kinetic energy of jogger  = ?

Solution:

To solve this problem, we use the kinetic energy equation:

    K.E  = [tex]\frac{1}{2}[/tex] m v²  

m is the mass

v is the velocity

 Now insert  the parameters and solve;

  K.E  =  [tex]\frac{1}{2}[/tex] x 65 x 2.5²   = 203.1J

Answer:

The Kinetic energy and mass are _directly_ proportional.

Explanation:

We know that Kinetic Energy is basically termed as the capacity of a body to do work.

Kinetic energy is often used to associate with moving objects, therefore, K.E is normally termed as the energy of motion.

The formula of K.E of an object of mass and velocity is defined

K.E = 1/2mv²

From the formula, it is clear that K.E is directly proportional to its mass and also directly proportional to the square of its velocity.

For example,

If A toy plane with a mass of 10 kg is flying at 20 m/s. Its K.E will be:

K.E = 1/2mv²

      = 1/2(10)(20)²

      = 1/2(10)(400)

       = 5(400)

      = 2000 J

Now, let suppose, if we double the mass of a toy plane i.e.

m = 20 kg

so

K.E = 1/2mv²

      = 1/2(20)(20)²

      = 1/2(20)(400)

      = 10(400)

      = 400 J

Therefore, the K.E is doubled when doubled the mass.

Therefore, the Kinetic energy and mass are _directly_ proportional.

Answer:

directly

Explanation:

Answer:

F = Gm1m2/r^2 where G = 6.67x10^-11, m1 =1300, m2 = 7800, r = 0.23m

F = 6.67x10^-11 *1300*7800/(0.23)^2 = 0.0127852N

Explanation:

Answer:

Momentum of car = 1200 kg * 10 m/s = 12000 kgm/s Momentum = Force * time 12000 kgm/s = Force * 20s Force = 600 N

Explanation:

Answer:

A

Explanation: The hotter things get the more thermal energy they have

Also don't ever take pictures like this again

Answer:A

Explanation:

1  kg of boiling water is hot enough to melt a block of ice more quickly

Answer:

in the ball

Explanation:

potential energy is where an object has energy, always, but it isn't always moving, and when you drop the ball, it has kinetic energy.

Answer:

probably when the next pandemic happens

Answer:

Increase in strength of hurricanes

Explanation:

A possible result of rising ocean temperatures caused by global warming is increase in strength of hurricanes.

Global warming is an environmental concern characterized by the gradual increase in the Earth's atmospheric temperature.

Global warming can lead to the rise of temperature in air and oceans as well.

One consequence of an increase in ocean temperature is that the strength of hurricanes, which is strong wind accompanied by rain, will be increased.

Therefore, a possible result of rising ocean temperatures caused by global warming is increase in strength of hurricanes.

Learn more about global warming at: https://brainly.com/question/12908180

Answer:

0.641 seconds

Explanation:

Distance (d) = 1.0 km

Using the relation :

Speed = distance / time

Time = distance / speed

Speed of sound in seawater is about 1560 m/s

Distance = 1.0km =

1km = 1000m

Time = 1000 / 1560

Time = 0.6410256

Time = 0.641 s

Answer: C. rapid evaporation of water in the soil :)

A possible result of higher air temperatures caused by global warming is rapid evaporation of water in the soil.

Global warming is a phenomenon that has been registered around the world during the last decades. It refers to a progressive increase in the average temperatures of the oceans and the Earth's atmosphere, which has consequences for flora and fauna, in addition to impacting critical sectors such as agribusiness.

Among the consequences of global warming are melting ice, rising sea levels, desertification, changes in rainfall, floods and reduced biodiversity.

See more about global warming at brainly.com/question/12908180

Answer:

40mph

Explanation:

20miles  .5 miles away if you go 20 mph you get there in a hour soo if you double to 40 mpg you get there in 0.5

Answer:

40 mph

Explanation:

you went 20 miles in half a hour, multiply twenty by 2 and you get 40

Answer:

Rita runs faster

Explanation:

To obtain the answer to the question given, we determine the speed of Rita. This can be obtained as follow:

Distance = 1.6 km

Time = 15 mins

Speed =?

Next, we shall convert 15 mins to hour. This can be obtained as follow:

60 mins = 1 h

Therefore,

15 mins = 15 mins × 1 h / 60 mins

15 mins = 0.25 h

Thus, 15 mins is equivalent to 0.25 h.

Finally, we shall determine speed of Rita as follow:

Distance = 1.6 km

Time = 0.25 h

Speed =?

Speed = distance / time

Speed = 1.6 / 0.25

Speed = 6.4 Km/h

Thus Rita's speed is 6.4 Km/h

Comparing the speed of Rahul and Rita

Rahul's speed = 4.5 km/h

Rita's speed = 6.4 Km/h

We can see that Rita's speed is greater than Rahul's speed. This simply indicates that Rita runs faster than Rahul.

Answer:

Displacement = 20 m

Explanation:

Given that,

Kyle runs 20 m north, 20 m west and then 20 m south.

We need to find Kyles's total displacement.

Total distance = shortest path covered by Kyles.

The net displacement of Kyle is 20 m in east direction. Hence, this is the required solution.

Answer:

loloololo

lol

Explanation:

lolloolololo

Answer:

What is the acceleration of an object moving at a constant speed?

The Meaning of Constant Acceleration

The data table above show an object changing its velocity by 10 m/s in each consecutive second. This is referred to as a constant acceleration since the velocity is changing by a constant amount each second.

Answer:

there is no acceleration for an object moving with constant speed

Explanation:

it is because acceleration is change in velocity and constant means same or without any change so there is no acceleration for an object which is moving with same speed

hope it helps:)

Answer:

Solution:

i) Heat supplied by heater = Heat gained by water = m * c*theta = 0.12Kg * 4200 * 10 = 5040Joules in 2 minutes.

ii) Power = Energy/time = 5040J/(2 * 60seconds) = 5040J/120seconds = 42Watts.

(iii) Heat supplied to the 70g of water = m * c * theta = 0.07Kg * 4200 * 9K = 2646J

(iv) Heat supplied by heater = Heat gained by 70g of water + Heat supplied to the metal vessel.

But,from our calculations above,

Heat supplied by heater = 5040J ......and

Heat supplied to the 70g of water = 2646J

.: substituting the values,we have that :

5040J = 2646J + Heat supplied to the metal vessel.

5040J - 2646J = Heat supplied to the metal vessel.

.: Heat supplied to the metal vessel = 2394J.

(v) Heat gained by metal vessel = Heat capacity of the vessel * theta.

2394J = Heat capacity of the vessel * 9K

.: Heat capacity of the vessel = 2394/9 = 266(Joule per Kelvin)

(vi) Using the formula:

Heat Capacity = mass * specific heat capacity

.: Specific heat capacity = Heat Capacity/mass = 266/0.55 = 484(Joules per Kilogram per Kelvin)

Explanation:

Answer:  If the net force on an object is zero, its acceleration will be zero. For example in free fall, the net force on an object equals its weight - the one force pulling on it. If 2 forces push or pull on an object in opposite directions, and the two forces cancel .

Explanation: PLEASE MARK ME AS BRAINLIEST!

We have that the  direction of the net force when one force is pulling down and one force is pushing to the right is given as

[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]

From the question we are told that:

One force is pulling down and one force is pushing to the right

Generally,

When two or more forces are acting in the same direction we have that the Resultant for or net for is a sum of the forces involved

Therefore

When one force is pulling down and one force is pushing to the right the Net force is in a direction that obeys the law

[tex]\theta=tan^{-1}\frac{y-axis\ force}{x-axis\ force}[/tex]

Therefore

[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]

In conclusion

The direction of the net force when one force is pulling down and one force is pushing to the right is given as

[tex]\theta=tan^{-1}(\frac{Down force}{Right force})[/tex]

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https://brainly.com/question/16380983

Answer:

A. identify plants and make assumptions on past climate conditions.

Explanation:

Answer was right on my Edge quiz!

Pollen grains help scientists identify plants and make assumptions on past climate conditions.

Proxy climate is climate inferred from past records i.e. not current.

Proxy climate makes use of proxy climate data also called proxies. These proxies help in inferring about the past climate.

Examples of proxies are;

Therefore, pollen grains help scientists identify plants and make assumptions on past climate condition.

Learn more about past climate at: https://brainly.com/question/9328022

Answer:

C) Nuclear fusion

Explanation: You had it correct  

Answer:

Nuclear fusion

Explanation: Answer choice C