3 years ago

For the simple harmonic motion equation

Physics

1 answer:

My name is Ann [436]3 years ago

3 0

Given that : d = 5sin(pi t/4), So, maximum displacement, d = 5*(+1) = 5 Also, maximum displacement, d = 5*(-1) = -5

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A copper part is heated. Does its mass, volume and density change?

DENIUS [597]

Answer:

It's volume and density will increase but NOT the mass

Explanation:

Heating copper in its elemental form is a physical change.

The mass of any substance does not change during a physical change, so the mass of copper will stay the same. However, its volume will increase, so its density will decrease.

6 0

3 years ago

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A ball thrown straight up climbs for 3.0 sec before falling. Neglecting air resistance, with what velocity was the ball thrown?

sesenic [268]

Answer:

Speed, u = 29.4 m/s

Explanation:

Given that, A ball thrown straight up climbs for 3.0 sec before falling, t = 3 s

Let u is speed with which the ball is thrown up. When the ball falls, v = 0

Using first equation of motion as :

v = u + at

Here, a = -g

So, u = g × t

$u=9.8\times 3$

u = 29.4 m/s

So, the speed with which the ball was thrown is 29.4 m/s. Hence, this is the required solution.

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3 years ago

In which circuit does charge reverse direction many times per second?

Karo-lina-s [1.5K]

Answer:

<u>D. An AC circuit</u>

Explanation:

AC= Alternating current

7 0

3 years ago

Which term is defined as the ratio of the speed of light in a vacuum to the speed of light in the material it is passing through

KATRIN_1 [288]

Answer:

Index of refraction

Explanation:

or refractive index

5 0

3 years ago

5. A helicopter scoops a load of water out of a lake, to dump on a forest fire. The helicopter exerts 6480

Strike441 [17]

Answer:

h = 250 m

Explanation:

Given that,

The helicopter exerts 6480 N of force on the water while rising high enough to fly over a mountain.

The helicopter does $1.62\times 10^6\ J$ of work on the water lifting it.

We need to find how high does it lift the water. Work done is given by :

$W=Fh\\\\h=\dfrac{W}{F}\\\\h=\dfrac{1.62\times 10^6}{6480}\\\\h=250\ m$

So, it can lift the water to a height of 250 m.

6 0

3 years ago