PHYSICS MIDDLE SCHOOL

What form of energy provides power for a gas stove? A.
nuclear energy

B.
electrical energy

C.
chemical energy

D.
sound energy

Answers

Answer 1
Answer:

The correct answer to the question is : C). Chemical energy.

EXPLANATION:

A gas stove provides energy when the gas present inside it, is burnt.

The gas contained inside it are natural gases which contain chemical energy. When gases come under fire or electric spark, the chemical energy is converted into light and heat energy.

No nuclear, electric or sound energy are consumed in providing power .

Hence, the correct statement is chemical energy.
Answer 2
Answer: a gas stove uses chemical energy.

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How much force is required to accelerate a 2 kg mass at 3 m/s2

Answers


Force = (mass) x (acceleration)                  Newton's second law of motion.

Force = (2 kg) x (3 m/s²)  =  6 newtons.

Which describes the characteristics of a liquid? A.
It has no fixed volume or shape.

B.
It has a fixed volume and varied shape.

C.
It has high energy and expands to fill the container.

D.
It has a fixed volume and shape.

Answers

the right answer is B because a liquid can take the shape of anything its in but it has the same volume

Violet light has a wavelength of 4.10x10 to the power of -12m what is the frequency?

Answers

Frequency of any wave = (the wave's speed) divided by (its wavelength)

Speed of light = about (3 x 10 to the 8) meters per second, in vacuum.

Frequency = (3 x 10 to the 8) / (4.1 x 10 to the -12) = 7.317 x 10 to the 19 Hz.

That's the same as 73,170,000,000 GHz.

Note: 
That's the answer for the information given in the question, but the information in
the question is incorrect by 5 orders of magnitude. The wavelength of violet light,
or anything in the visible range, is a few hundred 'nanometers' ... a few hundreds
of 10 to the -9 .  So the number in the question should be 4.10 x 10 to the -7,
not -12, and the frequency should be 731,700 GHz.

3. Three metal spoons are on a table. They are each at room temperature. If the three spoonstouch,
heat will flow among all three spoons.
heat will flow between two spoons.
no heat will flow among the spoons.
o heat will flow from the spoons to the air.

Answers

If the spoons touch, no heat will flow among the spoons. This is because they are already at thermal equilibrium with each other. This is hinted by the statement "they are at room temperature" which means they all have the same temperature. Heat only flows when there is a difference in temperature.

What do you know about stars?

Answers

Blue stars are hotter than red stars

And the closest star to earth is our sun
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two objects were lifted by a machine. one object had a mass of 2 kilograms and was lifted at the speed of 2 m/s. the other had a mass of 4 kilograms and was lifted at a rate of 3 m/s. which object had more kinetic energy while it was being lifted?"

Answers

to find the kinetic energy KE=1/2 × mass × velocity ^2
for object 1 ke= 1/2(2)(2^2)=4 J
for object 2 ke= 1/2(4)(3^2)=18J
meaning object 2 as more kinetic energy
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