2 years ago

4.2.5 quiz waves and technology

Physics

1 answer:

kolezko [41]2 years ago

6 0

Answer:

What’s the Question

Explanation:

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a. democracy

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beacouse the government control of their members

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When the only force acting on a falling object is air resistance, the object is said to be in free fall. true or false.?

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3 years ago

The maximum mass of a white dwarf is ______ times the mass of the sun.

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Answer:

(A)

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about 1.4 times the mass of our sun.

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The current in a radio measures 12 amps. The resistance of the radio is 4 ohms. What is the voltage?

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3 years ago

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A car is traveling at 70 km/h. It then uniformly decelerates to a complete stop in 12 s. Find its acceleration ( in m/s2 ).

Yakvenalex [24]

Answer:

Acceleration will be $-1.620m/sec^2$

Explanation:

We have given initial speed of the car is 70 km/hr

We know that 1 km = 1000 m

And 1 hour = 3600 sec

So $70km/hr=70\times \frac{1000m}{3600sec}=19.444m/sec$

It is given that car stops in 12 sec

So final speed of the car v = 0 m/sec

Time t = 12 sec

From first equation of motion v = u+at

So $0=19.444+a\times 12$

$a=\frac{-19.444}{12}=-1.620m/sec^2$ ( negative sign indicates that speed of the car will constantly decrease )

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3 years ago

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