PHYSICS HIGH SCHOOL

A 25-gram paper cup falls from rest off the edgeof a tabletop 0.90 meter above the floor. If the
cup has 0.20 joule of kinetic energy when it hits
the floor, what is the total amount of energy
converted into internal (thermal) energy during
the cup’s fall?
(1) 0.02 J (3) 2.2 J
(2) 0.22 J (4) 220 J

Answers

Answer 1
Answer: So a cup falls from the table top to the ground and acquires 0.20 J of kinetic energy in the moment it hits the ground and we want to know what is the total amount of energy converted into thermal energy. While it is on the table, the cup has potential energy and the kinetic energy is 0. The potential energy of the cup is Ep=m*g*h where m=mass of the cup, g= gravitational acceleration of 9.81m/s^2 and h=height of the table. So Ep=0.025*9.81*0.9=0.220725 J. That potential energy converts into kinetic energy and into thermal energy via friction that the air is causing. So Ep=Ek+Efriction. From here: Efriction=Ep-Ek=0.220725 J-0.20J=0.020725J So the correct answer is (1) 0.02J

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How many types of quarks are there?
a. 2
b. 4
c. 6
d. 8

Answers

There are 6 types of quarks.

Answer: C. 6
The are 6 types of quarks: up, down, strange, charm, top, and bottom.
The answer:

C.6

Which statement is a correct expression of the Law of Conservation of Mass?A.
The total mass is unpredictable in a chemical reaction.

B.
The total mass remains the same during a chemical reaction.

C.
The total mass decreases during a chemical reaction.

D.
The total mass increases in a chemical reaction.

Answers

The correct answer is B. The law of conservation of mass states that the mass of an isolated system is neither created nor destroy by chemical reaction or physical transformation. This means that the mass of subtances in an isolated system remains constant, it can not decrease and it can not increase.

Answer: B. The total mass remains the same during a chemical reaction.

Explanation:I Took The Test.

Why dog pants during summer use the cocept of evaporation

Answers

Every "warm-blooded" living thing needs a way to make heat and keep it
when its body is too cold inside, and a way to get rid of extra heat when
its body is too hot inside.

Moving around (using muscles) makes heat inside, and the animal needs
a way to get rid of the heat.  Fast.

Evaporation is a very effective way to get rid of heat.

Human animals do it by perspiring.  We excrete moisture through our skin,
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That's why we like to fan ourselves when we're hot ... moving more air
past our skin makes moisture evaporate faster.

Dogs don't perspire, so they badly need another way to get rid of heat
in a hurry.

They do it through their mouth.  They put water in their mouth if it's available,
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they blow air over it to evaporate it and get rid of heat.  Panting moves more
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What is the total displacement of a bee that flies 2 meters east, 5 meters north, and 3 meters east? explain how you did it

Answers

The displacement covered by the bee that flies 2 meters east, 3 meters east, and 5 meters north is 7.05 meters.

What is Displacement?

Displacement of an object can be defined as the actual change in the position of an object. It is a vector quantity because it has both the direction and the magnitude.

The bee travels 2 meter east and 3 meters east. Therefore, the total distance covered in the east direction is (2+3) meters = 5 meters.

The bee travels 5 meters in the north direction. This makes a square of 5 meters dimension and in this condition, the displacement covered by the bee will be the diagonal of the square. Therefore, the total displacement of the bee can be calculated as:

Diagonal of square = √(2)a

where, a = side of the square

Side of the square = 5 meters

Diagonal of the square = √(2) × 5

√(2) = 1.41

Therefore, diagonal = 1.41 × 5

Displacement of the bee = 7.05 meters

Learn more about Displacement here:

brainly.com/question/11934397

#SPJ2
It flies 2+3meters east and 5 meters north so it flies 5 east and 5 north. Then the way of it would be diagonal of 5x5 square it equals 5√2 which is 7.07.
 

Air is made of 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen is 1.29kgm^-3 and 1.43kgm^-3 respectively. What is the density of nitrogen? Please specify your soultion,thank you!

Answers

Volume % = mole %

Molar mass of oxygen = 32kg/kmol

Molar mass of nitrogen = 28 kg/kmol

 

Density of nitrogen = Density of oxygen x molar mass of oxygen x molar ratio of air x molar mass of nitrogen

Density of nitrogen = (1.43kgm^-3)(1 kmol O2/32 kg O2)(80 kmol N2/ 20 kmol O2)(28 kg N2/1 kmol O2) = 5.01 kg/m3

A rock falls off the edge of a cliff and strikes the ground after 3.8 s. What is the height of the cliff? Assume air resistance is negligible.

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Use the formula: 
h = vo*t - (1/2)gt^2 

Since the rock experiences freefall, initial velocity (vo) is zero: 
h = -(1/2)gt^2 

Substitute: 
h = -(1/2)(-9.8)(3.8^2) 
h = 70.756
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