What objects can be seen from earth because they producde there own light? 

Answers

Answer 1

Answer:
- neon signs
- fireworks
- rockets during the ascent
- meteors
- fireflies
- stars

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Срочно нужно решение задания 5, пожалуйста!!!!!
Suppose that at room temperature, a certain aluminum bar is 1.0000 m long. The bar gets longer when its temperature is raised. The length l of the bar obeys the following relation: l=1.0000+2.4×10−5T, where T is the number of degrees Celsius above room temperature. What is the change of the bar's length if the temperature is raised to 14.1 ∘C above room temperature?
Which of the following describes volumeA.the number of particles or amount of matterB.the amount of space that matter ocupiesC.how fast the particles are movingD.amount of massin a certain place
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When more than one force is acting on an object, the ____ determines the motion of the object.

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When more than one force is acting on an object, the net force determines the motion of the object.

The net force of an object is expressed as a value, such as net force = 5, and the motion of the object will change depending on how high or low that value is. For instance, if the net force is 0, the object won't move unless it is already moving, but if it is larger than 0, its motion will change.

During a _____ change a system absorbs energy from its surroundings

Answers

Endothermic reactions absorb energy from their surroundings. This is in contrast to exothermic reactions, which give out energy to their surroundings.

Answer:

Phase Changes Quiz

1. Temperature and number of particles are constant

2. Vaporization

3.Does not change

4. Freezing

5. Sublimation

6. Deposition

7. Kinetic molecular

8.Volume

9. Vapor/gas

10. Endothermic

Explanation:

What are the 3 types of mediums that sound can travel through

Answers

solid,liquid, gas is the answer hope it helps enjoyyyyy
!!!!!!!!!!!!!!!

an electron in a mercury atom changes from energy level b to a higher energy level when the atom absorbs a single photon with an energy of 3.06eV. Determine the energy of the photon, in joules.

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Hi There! :)

An electron in a mercury atom changes from energy level b to a higher energy level when the atom absorbs a single photon with an energy of 3.06eV.Determine the energy of the photon, in joules.

kg=15000J

A+block+of+1.2kg+is+placed+on+an+included+plane+at+60°+to+the+horizontal.+Calculate.+a.The+force+that+will+make+the+block+to+slide+down+the+plane.B.The+coefficient+of+friction+.C.+The+normal+reaction+d.+The+friction+force

Answers

Answer:

a. 10.2 N b. 1.73 c. 58.8 N d. 10.2 N

Explanation:

a. The force that will make the block slide down the plane

This is the component of the block's weight along the plane F = mgsinθ where m = mass of block = 1.2 kg, g = 9.8 m/s² and θ = angle of incline = 60°.

So, F = mgsinθ = 1.2 kg × 9.8 m/s² × sin60°.= 10.18 N ≅ 10.2 N

b. The coefficient of friction

The coefficient of friction, μ = tanθ = tan60° = 1.73

c. The normal reaction.

This is equal to the vertical component of the block's weight. So, F = mgcosθ. Substituting the values for the variables from above, we have

F = mgcosθ = 1.2 kg × 9.8 m/s² × cos60°.= 58.8 N

d. The frictional force

Since the block does not slide, there is no net force on it. If f is the frictional force, then

F - f = ma. Since a = acceleration = 0,

F - f = 0

f = F = mgsinθ = 1.2 kg × 9.8 m/s² × sin60°.= 10.18 N ≅ 10.2 N

Which of the following is an example of pure research? Creating new elements to study their properties Producing plastics that are heat-resistant to use in ovensDetermining how to reduce rusting on metal ships and cargo carriersFinding alternatives to gasoline to fuel transportation vehicles

Answers

Creating new elements in order to study their properties is definitely pure research.
It has no earthly [known] application, since the elements don't even exist, whereas
for each of the other choices, you've stated the desired application as the reason
for the search.

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