PHYSICS HIGH SCHOOL

A device that does work with one movement and changes the size or direction of a force is a(n)

Answers

Answer 1
Answer: A device that does work with one movement and changes the size or direction of a force is a simple machine.
Answer 2
Answer:

Answer:

it is a simple machine

Explanation:

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An electric buzzer is activated, then sealed inside a glass chamber. When all of the air is pumped out of the chamber, how is the sound from the buzzer affected?The sound is silenced.
The wavelength of the sound increases.
The frequency of the sound increases.
The wave speed of the sound increases.

Answers


The answer is that the sound is increased because the sound waves are mechanical waves, this means that they can't travel trough empty space they need a medium to travel.

Answer:

The sound is silenced.

Explanation:

I Just took the quiz

How does a stars life begin?

Answers

A stars life begins as a nebula (which would mostly be hydrogen) and starts to concentrate and compact with dust which then by gravity turns into a star. 

Which term defines the process of a wave bending as it enters a new medium?A. reflection
B. refraction
C. destructive bending
D. constructive bending

Answers

The term that defines the process of a wave bending as it enters a new medium is called B. REFRACTION

Refraction is the bending of a wave when it enters a medium where its speed is different. This phenomenon is explained by the conservation of energy and conservation of momentum.

Law of Conservation of energy states the total energy of an isolated system remains constant.

law of conservation of momentum states that in a closed system the total momentum is constant.

In refraction, when a medium changes, the phase velocity also changes but its frequency does not; it remains constant.



Scientists use different types of microscopes to observe objects that are not visible to the naked eye. A scientist is reviewing various samples of pond water to determine what species of microorganisms live in the pond. The scientist wishes to make drawings of the structure of each microorganism and study each one's method of movement. Which of the following microscopes would be best for the scientist to use?a.

transmission electron microscope

b.

scanning electron microscope

c.

compound light microscope

d.

dissecting microscope

Answers

A compound light microscope is the correct answer. Compound light microscopes provide a clear picture of many microorganisms, such as protozoans, and are used to view their structures and movements. Often, in the field of Microbiology, compound light microscopes are used for observing living microorganisms.

Answer;

-Compound light microscope

Explanation;

-A compound microscope is a microscope that uses multiple lenses to enlarge the image of a sample. It is commonly used for viewing samples at high magnification (40 - 1000x), which is achieved by the combined effect of two sets of lenses: the ocular lens and the objective lenses.

-Compound microscopes usually include exchangeable objective lenses with different magnifications (e.g 4x, 10x, 40x and 60x), mounted on a turret, to adjust the magnification. These microscopes also include a condenser lens and iris diaphragm, which are important for regulating how light hits the sample.

The index of refraction of a material medium must be less than 1 true or flase

Answers

That statement is flase.  The index of refraction
of every material is more than 1.0 .

Calculate the conductance of a conduit the cross-sectional area of which is 3.0 cm2 and the length of which is 9.0 cm, given that its conductivity is 0.80 ohm-1cm-1.

Answers

Answer: 0.266 ohm^(-1)

Explanation: Specific conductance or conductivity is the conductance for unit volume of a solution.

\kappa=C* (l)/(a)

where,

\kappa =Specific conductance  or Conductivity=0.80ohm^(-1)cm^(-1)

C = Conductance = ?

l = length= 9.0 cm

a = area = 3.0cm^2

(length)/(area)= cell constant =(9.0cm)/(3.0cm^2)=3cm^(-1)

0.80ohm^(-1)cm^(-1)=C* 3cm^(-1)

C=0.266 ohm^(-1)
for resistance we have R=ρ l/a
 thus for conductance we have K=σ a/l
conductance,K=1/R
conductivity,σ =1/ρ

σ = .80 Ω-1 cm-1
l =9 cm
a = 3 cm²
K=.80 ×3/9
  =0.26 Ω-1
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