PHYSICS HIGH SCHOOL

The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is _____________.Select one of the options below as your answer:
a. decreasing
b. increasing
c. unchanged

Answers

Answer 1
Answer: The average kinetic energy of the atoms that make up a substance which is changing from a liquid to a solid is decreasing. The answer is letter A. This  is because there is more room for movement of atoms if the pahse is in liquid than in solid.

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How does polarizing filter reduce glare?

Answers

Polarizing filter reduces glare by allowing glares only in a particular direction to pass through.

Glare are usually light vibrations in all directions, but the filter reduces the glare by allowing only light vibrations in a particular direction to pass through it, and hence cutting off other vibrations. Hence the glare becomes reduced.  

Which of the following represents a chemical change to matter? A. digestion of food B. melting an ice cube C. shredding paper D. crushing an ice cube

Answers

The answer is A. digestion of food. The chemical change to matter means that the molecule structure has been destroyed. For B, C and D. the matter are still ice, paper and ice. So they are physical change.

Calculate the annual potential energy contained in the water that is held back by the dam. Assume an average height of the water, h of 100.0 m. Express the answer in GJ (at least three significant figures).

Answers

Answer:

The potential energy can be given as

E = mgh. m is mass, g = acceleration due to gravity = 9.8m/s, h is the heigh, given as 100.0m

E = m x 9.8 x 100 = (980m)J

E = (980m)/10^9GJ = (0.000000980m)GJ to 3 significant figures

Explanation:

Hydroelectric dams exploit storage of gravitational potential energy. A mass, m, raised a height, h against gravity, g = 9.8 m/s², is given a potential energy E = mgh. The result will be in Joules if the input is expressed in meters, kilograms, and seconds (MKS, or SI units).

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

Answers


- neon signs
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Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.3 MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.3 cm and is 0.20 mm thick.Part AWhat is the resistivity of the leaf tissue?Express your answer to two significant figures and include the appropriate units.ρ=________Part BIs this greater than or less than the resistivity of muscle tissue in the human body?(A) greater or(B) less

Answers

Answer:

Part a)

\rho = 52.9 ohm- m

Part b)

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Explanation:

Part a)

As we know the formula of resistance is given as

R = \rho (L)/(A)

here we know that

\rho = (RA)/(L)

here we have

R = 2.3 M ohm

L = 20 cm

Area = (0.023)(0.20 * 10^(-3))

Area = 4.6 * 10^(-6) m^2

now we have

\rho = ((2.3 * 10^6)(4.6 * 10^(-6)))/(0.20)

\rho = 52.9 ohm- m

Part b)

Resistivity of mucle tissue of human is is ranging from 15 ohm-m to 50 ohm m so here we can say that

the resistivity of corn plant is grater than the resistivity of muscle tissue in the human

Which of the following states of matter is always a good conductor of electricity? solid, liquid, gas, or plasma **:/ Thank you!

Answers

Plasma...I believe is always a good conductor of electricity. I was tempted to say a solid, but not all solids are the same in composition and that goes for liquid and gas as well.

Hopefully this helped and good luck.
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