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Fittoniya [83]
3 years ago
14

Since lower case m stands for both the prefix.milli and for unit for length meter, how do we tell which one is meant when they a

re used?
A: a prefix is never used alone. So a lone m (lower case) would refer to a unit, the meter (the SI metric unit of length.)

B: the prefix Comes before the unit, so mm (both lower case) would stand for millimeter.

C: the prefix comes before the unit, so mg (both lower case) would stand for milligram.

D: all of the other 3 answer choices.
Physics
2 answers:
den301095 [7]3 years ago
4 0

Answer:

D: all of the other 3 answer choices.

Explanation:

A: a prefix is never used alone. So a lone m (lower case) would refer to a unit, the meter (the SI metric unit of length.)

Above statement is true because here we can see that when prefix is placed before any SI unit then only we use it let say if we use only unit "m" then it is clearly assumed to be meter

B: the prefix Comes before the unit, so mm (both lower case) would stand for millimeter.

TRUE

Since prefix is always used before SI unit then we have to use the prefix like it is shown here for length. when we give unit as "mm" then it will show millimeter.

C: the prefix comes before the unit, so mg (both lower case) would stand for milligram.

TRUE

Since prefix is always used before SI unit then we have to use the prefix like it is shown here for mass. when we give unit as "mg" then it will show milligram.

Tatiana [17]3 years ago
3 0

Answer:

D: all of the other 3 answer choices

Explanation:

Milli- is a prefix, so a lowercase m in front of any other letter means milli-.  For example, mm = millimeter and mg = milligram.

An m by itself means meters.

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Answer:

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Explanation:

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\theta is the angle between the directions of v and B

In this problem, the velocity of the particle is perpendicular to the magnetic field, so

\theta=90^{\circ}

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F=qvB

Also, the direction of this force is perpendicular to the direction of motion of the particle. This means that as the charge moves in the region of the magnetic field, the force acting on it acts as a centripetal force: therefore, the particle will start moving by unifom circular motion, with constant speed (because the magnetic force does no work on the particle, since it is perpendicular to the direction of motion).

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If you double the wavelength, the electromagnetic radiation energy will double. The energy of the electromagnetic radiation will
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Answer:

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Train car A is at rest when it is hit by train car B. The two cars, which have the same mass, stick together and move off after
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Helium gas contained in a piston cylinder assembly undergoes an isentropic polytropic process from the given initial state with
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Answer:

Heat transfer during the process = 0

Work done during the process = - 371.87 KJ

Explanation:

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Initial temperature T_{1} = 200 K

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Gas constant for helium R = 2.077 \frac{KJ}{kg k}

This is an isentropic polytropic process so temperature - pressure relationship is given by the following formula,

\frac{T_{2} }{T_{1} } = [\frac{P_{2} }{P_{1} } ]^{\frac{\gamma - 1}{\gamma} }

Put all the values in above formula we get,

⇒ \frac{T_{2} }{200} = [\frac{0.14 }{0.02 } ]^{\frac{1.4 - 1}{1.4} }

⇒  \frac{T_{2} }{200} = 1.74

⇒ T_{2} = 348.72 K

This is the final temperature of helium.

For isentropic polytropic process heat transfer to the system is zero.

⇒ ΔQ = 0

Work done W = m × ( T_{1} - T_{2} ) × \frac{R}{\gamma - 1}

⇒ W = 1 × ( 200 - 348.72 ) × \frac{2.077}{1.4 - 1}

⇒ W = 371.87 KJ

This is the work done in this process. here negative sign shows that work is done on the gas in the compression of gas.

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