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3 years ago

Define physical quantity

Physics

2 answers:

NemiM [27]3 years ago

7 0

Answer:

The quantity which can be measured is called physical quantity.

bonufazy [111]3 years ago

7 0

Answer:

Those quantities which can be measured are called physical quantities.

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How much force is needed to accelerate a 1,500 kg car at a rate of 7 m/s2?

Sidana [21]

Newton's 2nd law of motion:

   Force = (mass) x (acceleration)
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   (1,500 kg) x (7 m/s²) = 10,500 newtons .

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3 years ago

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An automobile battery has an emf of 12.6 V and an internal resistance of 0.0600 . The headlights together present equivalent res

murzikaleks [220]

Answer:

(a) $V=11.86\ V$

(b) $V=9.76\ V$

Explanation:

<u>Electric Circuits</u>

Suppose we have a resistive-only electric circuit. The relation between the current I and the voltage V in a resistance R is given by the Ohm's law:

$V=R.I$

(a) The electromagnetic force of the battery is $\varepsilon =12.6\ V$ and its internal resistance is $R_i=0.06\ \Omega$ . Knowing the equivalent resistance of the headlights is $R_e=5.2\ \Omega$ , we can compute the current of the circuit by using the Kirchhoffs Voltage Law or KVL:

$\varepsilon=i.R_i+i.R_e=i.(R_i+R_e)$

Solving for i

$\displaystyle i=\frac{\varepsilon}{ R_i+R_e}=\frac{12}{0.06+5.2}=2.28\ A$

i=2.28\ A

The potential difference across the headlight bulbs is

$V=\varepsilon -i.R_i=12\ V-2.28\ A\cdot 0.06\ \Omega=11.86\ V$

$V=11.86\ V$

(b) If the starter motor is operated, taking an additional 35 Amp from the battery, then the total load current is 2.28 A + 35 A = 37.28 A. Thus the output voltage of the battery, that is the voltage that the bulbs have is

$V=\varepsilon -i.R_i=12\ V-37.28\ A\cdot 0.06\ \Omega=9.76\ V$

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3 years ago

The tundra is located _______.

Leona [35]

Answer:

d: both north and south

Explanation:

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3 years ago

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Define physical quantity​

Define physical quantity