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4 years ago

Which quantities are scalars?

Physics

2 answers:

Fofino [41]4 years ago

7 0

Answer:

A and B

Explanation:

Because both of them have only magnitude not direction.

pashok25 [27]4 years ago

7 0

Answer:

I think it's either A or B. but i'm going to say B.

Explanation:

Hope my answer has helped you if not i'm sorry.

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Imagine you use Nitrogen as your gas. If you have the cold side as cold as you can without liquefying it (78 K), and run the hot

alina1380 [7]

Answer:

The efficiency of a Stirling engine is 74%

Explanation:

Given:

Temperature of gas when it is cold $T_{1} = 78$ K

Temperature of gas when it is hot $T_{2} = 300$ K

The efficiency of a stirling engine,

$\eta =1 - \frac{T_{1} }{T_{2} }$

$\eta = 1- \frac{78}{300}$

$\eta = 1-0.26$

$\eta = 0.74$

∴ $\eta = 74 \%$

Therefore, the efficiency of a Stirling engine is 74%

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3 years ago

The average human hair has a diameter of 100,000 nm. We can see individual hairs because hair has a diameter greater than the wa

sertanlavr [38]

B is the correct answer, since all others are not true or are based on assumption

6 0

3 years ago

You are driving up an inclined road. After 3.0 km you notice a roadside sign that indicates that your elevation has increased by

shutvik [7]

Answer:

~3°

Explanation:

x^2 + 0.16^2 = 3^2

x^2 + 0.0256 = 9

x^2 = 8.9744

x = sqrt(8.9744) = 2.99... = ~3

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3 years ago

Although this nation has made great progress in protecting the personal freedoms of its citizens since apartheid ended here in 1

Anestetic [448]

the Republic of South Africa country is being described by these statements

<u>Explanation:</u>

South Africa has the highest amount of people living with HIV/AIDS in the world. It was initially identified in 1982. The ANC came to power in 1994 after ten years of National Party inaction concerning AIDS. The ANC although took province with a formidable strategy, on record at least, for speaking HIV/AIDS.

A National AIDS Convention of South Africa (NACOSA), first gathered in 1992, brought collectively the ANC, the ANC-aligned United Democratic Front, and the National Party government’s ministry of health, to develop a comprehensive 1994 national AIDS plan based on robust projections: ‘HIV/AIDS is emerging as a major public health problem, with over 2,000 reported cases at the end of 1993, and 500,000 people infected with HIV’.

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3 years ago

Read 2 more answers

When physical activity is a set plan or program for all ages, usually performed by a group through a local recreational unit, it

Alexeev081 [22]

Answer:

C. Sports activity

Explanation:

A sport activity is a form of competitive physical activity in forms of games. They are normally organized for individuals to participate with the aim of improving physical abilities and skills, bring enjoyment to participants and act as a form of entertainment.

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3 years ago