3 years ago

Which type of interference occurs when two waves exactly cancel out? NEED AN ANSWER ASAP

1 answer:

4 0

If the two waves combine to produce ANY wave that smaller
than either of the originals, that's destructive interference.

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Melting Point of Substances

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<span>(kg) Melting Point of Tin

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An arrow of mass 0.5kg so it has 25J of kinetic energy; find the speed of the arrow v = m/s

miss Akunina [59]

Answer:

10 m/s

Explanation:

Use the kinetic energy formula:

KE=(1/2)mv^2

I always remember it as Kevin is half-mad, and very square.

25J = (1/2)*0.5kg*(v^2)

50J = 0.5kg*(v^2)

100J = v^2

v = 10 m/s

Check it:

KE = (1/2)*0.5*(10^2)

KE = 25J

yep, it's right!

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3 years ago

Which state of matter has the highest density

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Solids have the highest density. Then comes liquid and the less dense one is gas.

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What is the power generated by a 45 kg person who walks up a flight of 12 stairs, each 30 cm high, in 12 s?

Free_Kalibri [48]

The total distance covered by the person is 12 times the height of each stair:
$\Delta h=12 \cdot 30 cm=360 cm=3.60 m$

The work done by the person to climb the stairs is equal to the increase in his gravitational potential energy:
$W= \Delta U=mg \Delta h=(45 kg)(9.81 m/s^2)(3.60 m)=1589.2 J$

And therefore, the power generated by the person in 12 s is the work done divided by the time taken:
$P= \frac{W}{t}= \frac{1589.2 J}{12 s}=132.3 W$

So, the correct answer is B.

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4 years ago

How are velocity and acceleration related

VashaNatasha [74]

Answer:

Acceleration is the rate of change of velocity. If an object is changing its velocity, its speed, or changing its direction, then it is said to be accelerating.

Explanation:

when you change directions or speed up you are accelerating (or decelerating) and when you change directions or speed its called velocity.

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2 years ago