PHYSICS HIGH SCHOOL

Potential energy is the energy an object has because of itsa. density.
b. size.
c. location.
d. speed. E. temperature.

Answers

Answer 1
Answer: D. Locatian. Based on its formula Ep=m.g.h Which: m: Mass of object g: acceleration of gravity h: height (location where the object is located)

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Mr. Garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is _____.The answer should be one word. I was thinking either "magnetic" or "metal" but I'm not sure...

Answers

The main component of steel is iron ... the mother of all magnetic material.

Answer:

Iron

Explanation:

Steel is the purest form of iron with a little amount of carbon mixed in it. As we all know that iron is attracted towards magnet therefore we can say that steel can also be attracted towards magnet.

A wave travels at a constant speed. How does the frequency change if the wavelength increases by a factor of 2?A.The frequency decreases by a factor of 2. B.The frequency increases by a factor of 4. C.The frequency increases by a factor of 2. D.The frequency does not change.

Answers

Answer : The frequency decreases by a factor of 2.

Explanation :

Given that the wave travels at a constant speed. The speed of the wave is given as :

v=\nu* \lambda

Where

υ is the frequency of the wave

and λ is the wavelength of the wave.

In this case, the speed is constant. So, the relation between the frequency and the wavelength is inverse.

\nu\propto (1)/(\lambda)

If the wavelength increases by a factor of 2, its frequency will decrease by a factor of 2.

Hence, the correct option is (A) " The frequency decreases by a factor of 2 ".
A.The Frequency decreases by a factor of 2.

Gravity is a force of attraction between objects that is due to their weight and height between one another. a. True
b. False

Answers

The statement above is false. The statement should be: "Gravity is a force of attraction between objects that is due to their masses." Mass and weight are often interchanged. Gravitational force depends on the masses of objects, but the size of this force is what weight is. So the relationship is:

Weight = mass x gravitational constant = mass x 9.81 m/s^2

The weight of a body will be zero during free fall. Why? ​

Answers

Answer:

The apparent weight of a freely falling body is zero. When a body falls freely, it is falling with an acceleration =g. Thus the entire gravitational force acting on it is utilized in accelerating it and hence its weight is not felt.

What is the main force that causes a star to turn into a black hole?Temperature
Gravity
Pressure
Nuclear explosions.

Answers

Gravity. When a dying star of sufficient mass is no longer to support nuclear reactions in its core, it loses the pressure in the core that supports the entire star. Since there is now nothing to counter its own gravity, the entire star implodes until it becomes either a neutron star or, if its mass is large enough, a black hole. 

When heating a substance, a phase change will start to occur when the kinetic energy of the particles is _____________ the attractive forces between the particles. Question 8 options: A. great enough to combine
B. low enough to combine
C. low enough to overcome
D. equal to
E. great enough to overcome

Answers

Answer: E. great enough to overcome.

Explanation: The three phases of the substances are solid, liquid and gas.

When a substance is heated, that is the molecules gain kinetic energy as kinetic energy is directly proportional to temperature.

The phase change will take place only when kinetic energy will be greater than the inter molecular forces as the molecules have to move in more random motion.

For example: Solid with high inter molecular forces are heated to convert it into liquid state only when kinetic energy will overcome the inter molecular forces of attraction.
Your answer is great enough to overcome :) 
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