Gravity is affected by

Answers

Answer 1

Answer:

Gravity is affected by mass and distance

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Examples of the skills used in science include ____ and ____. a. data, diagrams b. clues, detectives c. facts, inferences d. observations, measurements

Answers

Examples of the skills used in science include measurements and observations. I am pretty sure that the last option is the most suitable one, because it represents main tools that scientists use during the research whereas the rest of represented tools are used in criminal and math issues.

Butter melts when you heat it on a pan on the stove.is this a chemical changes or physical changes?

Answers

Answer:

No chemical bonds are broken or formed in melting butter, so it is not a chemical change. The melting process is only a physical change, the change of state from solid to liquid.

Answer:

I think it's physical change because originally it was a solid but now it's a liquid and its chemical properties have not changed only shape

A ray of light is projected into a glass tube that is surrounded by air. The glass has an index of refraction of 1.50 and air has an index of refraction of 1.00. At what minimum angle will light in the glass tube be totally reflected at the glass/air interface?

Answers

Answer:

θ = 41.8º

Explanation:

This is an internal total reflection exercise, the equation that describes this process is

sin θ = n₂ / n₁

where n₂ is the index of the incident medium and n₁ the other medium must be met n₁> n₂

θ = sin⁻¹ n₂ / n₁

let's calculate

θ = sin⁻¹ (1.00 / 1.50)

θ = 41.8º

Thermal energy is added to a sample, its particles move ?

Answers

Yes, if the temperature increases, than that means the particles are moving faster. Temperature is the measure of movement of particles in an object or substance.

By thermal energy, you mean adding heat correct....? I'm not very good at this sort of thing, but I gave you what I have..

a boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him

Answers

Answer:

Explanation:

As the boy is riding from top to bottom of the hill his Potential energy gradually decreasing and simultaneously converting into the Kinetic energy.

At the top, his Potential Energy is maximum and kinetic energy is minimum i.e. zero

In the middle of the hill, he possesses both Potential and kinetic energy with equal magnitude.

At the bottom whole Potential energy is converted into Kinetic energy.

Thus Potential Energy is maximum at the top while Kinetic energy is maximum at the bottom.

At about 55 meters/sec, a falling parachuter (before the parachute opens) no longer accelerates. Air friction opposes acceleration. Although the effect of air friction begins gradually, imagine that the parachuter is free
falling until terminal speed (the constant falling speed) is reached. How long would that take?

Answers

Well, it takes one second to get every 10 meters (if $g=10 m/s^2$ ), so one needs just 5.5 seconds. He would fall 137.5 meters (if my calculations are right) during that time.

Answer:

5.6 seconds

Explanation:

I did the worksheet and got it right

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