The pattern shown in the photo is the result of a time-lapsr video of a clear night sky

Which mostly likely causes the apparent motion of the stars seen in this photo?
A. Earth's revolution around the Sun
B. The revolution of the Stars around the Sun
C. Earth's rotation on its axis
D. The revolution of the stars
around Earth​

Answer:

KE=800,000

Explanation:

The formula for kinetic energy is KE=1/2mv^2 or Kinetic Energy= 0.5*mass*velocity^2

so 1000 is the mass and 40 is the velocity

KE=0.5*1000*40^2

KE=0.5*1,000*1,600

KE=800,000 Joules

Answer:

Power

Explanation:

Power is defined as the rate of doing work with reference to the time spent and the formula is force multiplied by velocity.

In this case, if two people lift identical stacks of books the same distance and one person does the job twice as fast, then it means the velocity in the case is doubled which will also lead to an increase in the Power .

The formula for power is Work divided by time taken, so P=W/T.

That case, involved power, since one of the people did work twice as fast, but, it was the same amount of work each person did, for the same distance (not exact distance, but usually the same)

Answer:

a. La ciencia.

Explicación:

El método científico de la física experimental y su búsqueda de respuestas tiene un principio básico que es la ciencia. La ciencia es la aplicación del conocimiento del mundo natural y social siguiendo una metodología sistemática basada en evidencias. Sin evidencias no hay aceptación de la observación ni se debe hacer teoría porque la evidencia es el principal criterio para aceptar o rechazar una hipótesis.

Answer:

 its not long dummy, its your imagination

Explanation:

Answer:

675J

Explanation:

Given parameters:

Force  = 45N

Distance  = 15m

Unknown:

Work done by Sheila  = ?

Solution:

Work done by a body is the amount of force applied to make a body move through a distance;

         Work done  = Force x distance

 Now;

          Work done  = 45 x 15  = 675J

Answer:

Both eggs are identical. The aim is to find out the highest floor from which an egg will not break when dropped out of a window from that floor. If an egg is dropped and does not break, it is undamaged and can be dropped again. However, once an egg is broken, that's it for that egg.

Answer:

The force is of the weight 862,4 Newtons.

Explanation:

We have the formula:

w = m * g

Data:

w = weight = ¿?

m = mass = 88 kg

g = gravity = 9,8 m/s

Replacing according formula:

w = 88 kg * 9,8 m/s

Resolving:

w = 862,4 N

Electron , photon and proton carry energy which is option (a) , (b) ,(c)

Photons are massless, but they have energy [tex]E = hv= \frac{hc}{\lambda}[/tex]

Here 'h' is called Planck's constant .

For electron and proton energy is given by

 [tex]E=\frac{1}{2} \times mv^2[/tex]

Where m is the mass of the particle and v is the speed of particle .

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most fossils are found in sedimentary rocks

Answer:

Sedimentary rock.

Explanation:

Answer:

See image and explanation

Explanation:

A simple pendulum consists of a string to which a bulb is attached and the string is tied to a support. The string swings from one end to the other as shown.

At the both ends, the energy of the pendulum is all potential. Hence we have 100J potential energy at both ends.

When the pendulum is in motion, the energy is all kinetic at the center of motion. Hence at that point, we have 100J kinetic energy.

In between both extremes the energy is both kinetic and potential as shown. The total energy is this a summation of the two.

Answer:

A simple pendulum consists of a string to which a bulb is attached and the string is tied to a support. The string swings from one end to the other as shown.

At the both ends, the energy of the pendulum is all potential. When the pendulum is in motion, the energy is all kinetic at the center of motion.

In between both extremes the energy is both kinetic and potential as shown. The total energy is this a summation of the two.

The Average Speed of the Porg is 3.8 m/s.

Let us say that the initial speed is u which is equal to 0.8 m/s and the final speed of the porg to be v which is equal to 6.8 m/s.

The total time period of the motion is given to us as 5 seconds. Let us represent the acceleration of the body as a, acceleration of the body given is 1.2m/s².

Here since the direction of the motion is not changing and the acceleration is constant, we can use the kinematic equations of motion.

Let say that the body covers distance d in 5 seconds.

To find the distance covered by the body we will use the equation,

v²-u²=2da

Putting all the values,

(6.8)²-(0.8)²²=2(1.2)d

46.24 - 0.64 = 2.4d

45.6 = 2.4d

d = 19m

The distance covered by the porg is 19 meters.

Now let say Average Speed is S.

As we know, the average speed of the body (S) = Total distance covered(d)/total time taken(t)

S = d/t

Average speed = 19/5

Average sped = 3.8 m/s.

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Answer:50kg

Explanation:

Answer:

[tex]\textbf {Engine}[/tex]

Explanation:

Electric motor in cars is an example of electromagnetic device.

Answer:

Nuclear fusion is difficult to achieve because at low temperatures and pressures  the positively charged nuclei of deuterium and tritium electrostatically  each other is explained below in complete details.

Explanation:

For nuclear fusion to happen, very eminent temperatures are needed to succeed the opposing force between the positively energized nuclei of a specific isotope.  Fusion doesn't release dangerous toxins like co2 or other greenhouse gases into the environment. Its significant by-product is helium: an inactive, non-toxic gas. No long-lasting radioactive ruin: Nuclear fusion reactors generate no high action, long-lived nuclear ruin.

Answer:

repel

Explanation:

its called electrostatic repulsion

Answer:

oooh thanks

Explanation:

..................

Answer:

awwww thx you are to :)

Explanation:

Answer:

b Wind blowing West to East away from horse latitudes

Explanation: prevailing Westerlies are winds which blows away from the horse latitudes, this type of wind blow towards the poles between latitude 30 degrees to latitude 60degrees.

Prevailing Westerlies are known to be strongest in the winter months in the and weakest in the summer months

They are also very strong when the pressures are low over the poles and also very weak when the pressures are high over the poles.

Explanation:

Black or Dark color clothes are good absorbers of heat. The heat from the sun is absorbed by the black shirt, thus making the shirt warmer. The sunlight here is source of heat. The amount of heat absorbed can be calculated according to the stephan's law.

The scientific experiment is limited due to common sources of errors.

The use of unreliable measurement equipment is one of the causes of incorrect data . Instrumental, environmental, procedural, and human errors are frequent causes. Depending on how they impact the outcomes, each of these mistakes can either be random or systematic. Additionally, mistakes might be made when capturing observations or data. In doing an experiment on the exchange of energy between colliding objects, something unexpected happened.

In this experiment, the observation technique or the equipment used to record the data are wrong, which gives us false findings, leading us to the conclusion that the scientific experiment is constrained by the usage of the same observation technique and instrument.

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The work done by F is 4472.4J.The work done by the normal force is 0J.The work done by the gravitational force is 0J.The  friction force is ineffective as the object is not in contact with surface.

The energy that is transmitted to or from an object when a force is applied along a displacement is referred to as work in physics.In its simplest form, it is usually explained as the result of force and displacement. Positive work is the term for the component of a force that moves the point of application when it is applied. A force is said to do negative work if, at the point of application, one of its components points in the opposite direction of the displacement. Work is a scalar quantity, hence it only has magnitude and no direction. Through work, energy is transported from one place or one form to another.

Calculations:

a)

d = distance travelled = 5.6 m

Work done by the applied force F is given as,

Wa = F d Cos\theta = (1000) (5.6) Cos37 = 4472.4 J

b)

Work done by the normal force Fn is given as,

Wn = Fn d Cos90 = Fn (5.6) Cos90 = 0 J

c)

Work done by  the gravitational force "mg" is given as,

Wg = mg d Cos90 = mg (5.6) Cos90 = 0 J

d)

Using the equilibrium of force in vertical direction,

Fn + F Sin\theta = mg

Fn + 1000 Sin37 = 50 x 9.8

Fn = - 111.82 N

Frictional force will be ineffective since the object is not in touch with the surface and normal force is negative.

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The amount of force exerted on a cart that is full of groceries of mass of 180.0kg is 630N.

The force applied on an object can be calculated by multiplying the mass of the object by the acceleration as follows:

Force = mass × acceleration

According to this question, a cart is full of groceries and has a mass of 180.0kg. The force, if cart accelerates at a rate of 3.5 m/s², can be calculated as follows:

Force = 180kg × 3.5m/s²

Force = 630N

Therefore, the amount of force exerted on a cart that is full of groceries of mass of 180.0kg is 630N.

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Answer:

Parallel circuits :)

Answer:

True

Explanation:

An object at rest will stay at rest unless acted on by an unbalanced force.

Answer:

f=ma

f=70N

m1=50kg

m2= 60kg

a1= f/m

a1= 70/50

a1= 1.4N/kg

a2= 70/60

a2=1.17N/kg

Answer:

Explanation:

When the sun rises every morning, it brings light and heat into earth. Plants need energy to live, so they convert the sun's light into chemical energy. (photosynthesis). Then animals eat those plants. Without the sun, we would not have any food, and very little sources of light.

Answer:

Mercury shows faster increase in temperature than water on heating because the mercury has less specific heat capacity than water.

The specific heat capacity is defined as the amount of heat to required by a mass of a material to make a unit change in its temperature.  Mercury has less specific heat capacity and shows immediate changes in the temperature. Because of this mercury is used in thermometers and not water.

the final velocity of the combined gliders is  -0.392m/s.

perfectly inelastic collision - It is the process of striking one object to another without conserving the kinetic energy of two object.

m₁ =  0.240 (mass of first glider)

v₁ = - 0.6m/s ( velocity of first glider)

m₂ =0.260 (mass of 2nd glider)

v₂ = 0.2 m/s ( velocity of 2nd glider)

[tex]v_{f}[/tex] = ?

for perfectly inelastic collision

m₁v₁ + m₂v₂ = (m₁+ m₂)[tex]v_{f}[/tex]

[tex]v_{f}[/tex] = m₁v₁ + m₂v₂ /(m₁+ m₂)

  [tex]v_{f}[/tex]  =   [tex]\frac{0.240*(-0.6+0.260*0.2)}{0.240+ 0.260}[/tex]

  [tex]v_{f}[/tex] = -0.392 m/s

the final velocity of the combined gliders is  -0.392m/s.

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According to the scientific method, you have to make observations and ask questions before you can form a hypothesis.

The scientific method is a series of steps or procedures which scientists follow in their process of discovery and explanation of the natural world or natural phenomena.

The scientific method consists of the following steps:

In conclusion, observations and questions are important before formulation of hypothesis.

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