Which of the following statements is not true regarding atmospheric pressure?A. You calculate absolute pressure by adding atmospheric pressure to gage pressure.
B. When atmospheric pressure is higher than the absolute pressure of a gas in a container, a partial vacuum exists in the container
C. Mercury and aneroid barometers are used to measure atmospheric pressure.
D. Atmospheric pressure increases with increasing altitude

Answers

Answer 1

Answer: The correct answer is option B. i.e.When atmospheric pressure is higher than the absolute pressure of a gas in a container, a partial vacuum exists in the container. This is the incorrect statement about atmospheric pressure and the absolute pressure.

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In the modern quantum-based atomic theory, what is the name given to a particular space around the nucleus in which an electron moves?

Answers

In the modern quantum based atomic theory, the name given to a particular space around the nucleus in which an electron moves is called orbital. You might be interested to know a little more about the term orbital. Atomic orbital is actually a mathematical function that describes the wave like nature of a single electron or a pair of electrons within an atom.

Answer:

orbital

Explanation:

A rain gutter is to be constructed from a metal sheet of width 30 cm by bending up one-third of the sheet on each side through an angle θ . How should θ be chosen so that the gutter will carry the maximum amount of water?

Answers

Answer:

Explanation:

The volume of the water carried will be proportional to the cross-sectional area. The cross-section is a trapezoid with height 10sint, where t represents theta. The top of the trapezoid is 10+(2)(10cost), i.e. 10 + 20cost. The base of the trapezoid is 10.

Area of trapezoid = (average of bases) times (height)

= ([10 + (10 +20cost)] / 2 ) 10 sint

= (10 + 10cost)(10sint)

= 100sint + 100sintcost, call this A(t). You need to maximize. So differentiate and set equal to zero.

dA/dt = -100sin(t)^2+100cos(t)+100cos(t)^2 = 0, divide by 100:

-sin(t)^2 + cos(t) + cos(t)^2 = 0, replace sin^2 by 1-cos^2

2cos(t)^2 + cos(t) - 1 = 0, factor

(1+cos(t))(2cos(t)-1)=0, so

cos(t)=1, t=0 that give a min (zero area) not a max, or

cos(t) = 1/2, so t=60 degrees. This gives the max.

The potential difference across wire is 75V and its electric resistance is 30Ω. Find out the electric current through the wire.

Answers

Answer:

current = 2.5A

Explanation:

We can use Ohm's law which states that V∝R so V=IR when the temperature is constant where V is the voltage (potential difference), I is the current and R is the resistance.

75= 30I

I= 75/30= 2.5A

Explain how machines make work easier if they still require that the same amount of work be done.

Answers

Machines make work easier even if they still require the same amount of work to be done. We humans get tired because we do not have constant source of energy for the work to be done.Machines have a constant source of energy such as electricicity. Humans too will work at the same rate without getting tired if they are also provided with constant energy.

well machine do not feel pain of course and us humans and people do feel pain of course but if we fell pain and get hurt it slows down the process but machines on the other hand can keep going until the life source runs out. if i helped plz make mine the best

What is relative velocity?

Answers

Relative velocity is the velocity of an object or observer B in the rest frame of another object or observer A

Answer:

the velocity of a moving body relative to another body is called relative velocity.

Which of the following contains the most thermal energy?a. a cup of hot water
b. a cup of cold water
c. a hot tub full of hot water
d. a large bucket of hot water

Answers

the answer would be c.

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Visible light is an example of?