PHYSICS HIGH SCHOOL

When all parts of a circuit are composed of conducting materials, the circuit is said to be A. shorted.
B. closed.
C. parallel.
D. open.

Answers

Answer 1

Answer:

Answer:

The circuit is said to be closed

Explanation:

Electricity is defined as the movement of electrons within a conductor in a certain path.

This means that, for electricity to flow, two conditions need to be fulfilled:

1- there must be conductor materials for electrons to move through

2- a closed path (loop) must exist to allow the flow of electrons

If wither of these conditions is not met, the movement of electrons will be stopped and therefore, electricity will not be conducted

Based on the above, when all parts of a circuit are composed of conducting materials (conductors forming closed path), the circuit is said to be closed (a loop exists for electrons to move in).

Hope this helps :)

Answer 2

Answer: When all arts of a circuit are composed of conducting materials, it is said to be closed, so B.

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An atom's tendency is to become stable. What does this mean?

Answers

An atom's tendency to become stable is associated with its tendency to attract electrons, resulting to the formation of compounds. This is due to the rule of valency which states that a stable atom consists of 8 electrons. So atoms with less than 8 electrons tend to attract electrons and form compounds.

A fixed mass of gas has a volume of gas of 25cm3. the pressure of the gas is 100kPA. the volume of the gas is slowly decreased by 15cm3 at a constant temperature. what is the change in the pressure of the gas?a) 67kPA
b) 150kPA
c) 170kPA
d) 250kPA
give reasons

Answers

A fixed mass of gas has a volume of 25 $cm^3$ , the pressure of the gas is 100 kPa, the volume of the gas is slowly decreased by 15 $cm^3$ at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.

What is the calculation of the change in pressure?

PV = nRT (P= pressure of the gas, V =volume, n = number of moles of gas, R = gas constant, and T =temperature of the gas in kelvin)

Suppose the gas is an ideal gas and that the temperature is constant,

P1V1 = P2V2

Here P1 = 100 kPa, V1 = 25 $cm^3$ , V2 = 10 $cm^3$ ,

100 kPa x 25 $cm^3$ = P2 x 10 $cm^3$

P2 = (100 kPa x 25 $cm^3$ ) / 10 $cm^3$

P2 = 250 kPa

the change in pressure of the gas is,

ΔP = P2 - P1 = 250 kPa - 100 kPa = 150 kPa

The reason is that when the volume of a fixed mass of gas is decreased, the pressure of the gas increases proportionally, so here assuming that the temperature is constant it is calculated.

Hence, the volume of the gas is slowly decreased by 15 $cm^3$ at a constant temperature, and the change in pressure of the gas is 150 kPa, which is option b.

Learn more about the calculation of the change in pressure here.

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On a spending spree in Malaysia, you buy an ox with a weight of 28.9 piculs in the local unit of weights: 1 picul = 100 gins, 1 gin = 16 tahils, 1 tahil = 10 chees, and 1 chee = 10 hoons. The weight of 1 hoon corresponds to a mass of 0.3779 g. When you arrange to ship the ox home to your astonished family, how much mass in kilograms must you declare on the shipping manifest? (Hint: Set up multiple chain-link conversions.)

Answers

Answer:

1747.41 kg

Explanation:

If 1 piculs = 100 gins,

Then 28.9 piculs = (28.9 × 100) gins = 2890 gins.

Also,

If 1 gin = 16 tahils

then 2890 gins =( 16 × 2890 ) = 46240 tahils

Also,

If 1 tahil = 10 chees,

Then 46240 tahils = 46240 × 10 chees = 462400 chees.

Also,

If 1 chee = 10 hoons

Then 462400 chees =( 10 × 462400) hoons = 4624000 hoons.

Also,

If 1 hoon = 0.3779 g,

Then 4624000 hoons = 0.3779 × 4624000 = 1747409.6 g.

The mass in kg that i will declare in the shipping manifest = (1747409.6/100 )kg = 1747.41 kg

A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-n force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?

Answers

A 5.0 kg object is pulled by a 15-N force acting 20 °C above the horizontal. After moving for 6.0 m, the work done is 85 J.

What is work?

In physics, work is the energy transferred to or from an object via the application of force along a displacement.

A 5.0 kg object is pulled by a 15-N force acting 20 ° above the horizontal. We can calculate the work done after the object moved 6.0 m using the following expression.

W = F × s × cosθ

W = 15 N × 6.0 m × cos 20° = 85 J

where,

W is the work.
F is the force.
s is the displacement.
θ is the angle between F and s.

A 5.0 kg object is pulled by a 15-N force acting 20 °C above the horizontal. After moving for 6.0 m, the work done is 85 J.

Learn more about work here: brainly.com/question/62183

Answer:

84.6 J

Explanation:

The work done by the force is given by

$W=Fd cos \theta$

where

W is the work done

F = 15 N is the force applied

d = 6.0 m is the displacement

$\theta=20^(\circ)$ is the angle between the force's direction and the displacement

Substituting the numbers into the equation, we find

$W=(15 N)(6.0 m)cos 20^(\circ) =84.6 J$

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.

which unit of measure would scientist use to measure the thickness of rock layer, created as a result of volcanic activity

Answers

A scientist would use a unit of length appropriate for the magnitude of what he or she is measuring. In this case, since rock is built up very slowly, they would probably use millimetres or centimetres. In some cases they may use meters.

There you go.

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