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1 year ago

Cool air tends to...

Physics

1 answer:

IceJOKER [234]1 year ago

3 0

Answer: C. Be more dense and flow under warm air.

Explanation:

think of a supermarket selling dairy products and when you open the fridge to get the milk, outside the supermarket is hot and inside the fridge is cold ice.

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A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. an idealized model of a

Sedbober [7]

I cant SCIENCE SRY about that

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2 years ago

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You or your personal trainer should always use the _____ safety screening.

Pachacha [2.7K]

The answer to the question presented above would be PAR-Q or the Physical Activity Readiness Questionnaire. The purpose of this questionnaire is to identify if you have any medical risks and to know your overall medical background for future reference of prevention of complications whenever you're training.

7 0

3 years ago

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What capacitance is needed to store 3μC of charge at a voltage of 120V?

katrin [286]

Answer:

C = 0.025F

Explanation:

Charge =q=3× $10^{-6}$ C

Voltage=V=120V

Q=CV

C=Q/V

=3× $10^{-6}$ /120

=1/40× $10^{-6}$

C = 0.025F

C=2.5 $10^{-4}$ C 0r 25 × $10^{-3}$ F

3 0

2 years ago

A series R-L-C circuit is connected to a 70.0 Hz ac source that has Vrms = 80.0 V . The circuit has a resistance of 80.0 Ω and a

Andreyy89

Answer:

62.7 VA

Explanation:

The apparent power (power supplied by the source) of an AC circuit is determined by

$S = \frac{(Vrms)^2}{Z}$

The impedance(Z) depends on the frequency, but in this case it is given to us that it is 102 ohms at this frequency.

So:

$S = \frac{(80 V)^2}{102 \Omega} = 62.7 VA$

3 0

3 years ago

A magnetic field is uniform over a flat, horizontal circular region with a radius of 2.00 mm, and the field varies with time. In

Shkiper50 [21]

Answer:

0.00016391 V

0.00038665 V

Explanation:

r = Radius = 2 mm

$B_i$ = Initial magnetic field = 0

$B_f$ = Final magnetic field = 1.5 T

t = Time taken = 115 ms

Induced emf is given by

$\varepsilon=\frac{d\phi}{dt}\\\Rightarrow \varepsilon=\frac{A(B_f-B_i)}{dt}\\\Rightarrow \varepsilon=\frac{\pi 0.002^2(1.5)}{0.115}\\\Rightarrow \varepsilon=0.00016391\ V$

The magnitude of the induced emf is 0.00016391 V

$B_i=+1.5\ T$

$B_f=-0.5\ T$

t = 65 ms

$\varepsilon=\frac{d\phi}{dt}\\\Rightarrow \varepsilon=\frac{A(B_f-B_i)}{dt}\\\Rightarrow \varepsilon=\frac{\pi 0.002^2(-0.5-1.5)}{0.065}\\\Rightarrow \varepsilon=-0.00038665\ V$

The magnitude of the induced emf is 0.00038665 V

3 0

3 years ago