2 years ago

Is a sound wave mechanical or an electromagnetic wave

Physics

1 answer:

NNADVOKAT [17]2 years ago

7 0

It is a mechanical wave and cannot travel through a vacuum.

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The accompanying map shows the route traveled by a school bus.

Shtirlitz [24]

Answer:

Explanation:

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2 years ago

The barrel of a rifle has a length of 0.855 m. A bullet leaves the muzzle of a rifle with a speed of 553 m/s. What is the accele

Novay_Z [31]

Answer:

Acceleration of the bullet will be 1778835.6 $m/sec^2$

Explanation:

We have given length of the barrel refile s= 0.855 m

When the bullet leaves the muzzle its velocity is 553 m/sec

So final velocity v = 553 m/sec

Initial velocity will be 0 that is u = 0 m/sec

According to third equation of motion $v^2=u^2+2as$

$553^2=0^2+2\times a\times 0.855$

$a=178835.6m/sec^2$

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3 years ago

physical changes occur when existing bonds break and new bonds form

Luba_88 [7]

<span>A physical change is any change that alters the form or appearance of a substance but does not change it into another substance
-Some of the physical properties may be altered, but the chemical composition stays the same
-Examples: Bending, Crushing, Cutting, Melting, Freezing, Boiling</span>

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2 years ago

The charge that passes a cross-sectional area A=10-4 m2 varies with time according

Anarel [89]

Answer:

Current = dQ/dt

or I = dQ/dt

Where I represents current.

Which is the rate of flow of charge.

Q=4 + 2t + t²

dQ/dt = 2 + 2t --- This is the relation that gives the instantaneous current.

At time t=2sec

dQ/dt = I = 2 + 2t

= 2 + 2(2)

=2 + 4

= 6A.

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2 years ago

How long will it take a car to go from 0 to 45 km/hr if they are accelerating at 5 km/hr/s?

Mandarinka [93]

Answer:

9 seconds

Explanation:

$acceleration = \frac{final \: speed - initial \: speed}{time \: taken}$

$5km/ hr/ s = \frac{45 - 0 (km/ h)}{t}$

cross multiplying

$5t = 45 secs \\ t = 9 \: secs$

it will take 9secs for the car to go from 0 to 45 km/ h

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2 years ago