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3 years ago

True or false Lightning happens because of the release of static electricity.

Physics

2 answers:

Shtirlitz [24]3 years ago

4 0

Question: True or False
Lightning happens because of the release of static electricity.

Answer: True

SOVA2 [1]3 years ago

3 0

Yes it is true , lightning happens because of the release of static electricity

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A thread holds two carts together on a frictionless surface. A spring is compressed

Goryan [66]

Answer:

Velocity on the right side of the cart $=0.09\ ms^{-1}$

Explanation:

Given

⇒The mass on the left of the cart $m_1=1.5\ kg$

Its velocity $v_1=27\ cm/s$ , $v_1=\frac{27}{100}=0.27\ m/s$

⇒Mass on the right of the cart $m_2=4.5\ kg$

Velocity $=?$ We have to find $v_2$

From

The law of conservation of linear momentum:

We can say that.

Initial momentum will equalize the final momentum.

And momentum is the product of mass and its velocity.

Assigning one of its velocity as negative because both are in different direction.

Lets call $v_1=-0.27m/s$

Recalling the formula and plugging the values.

$m_1(-v_1)+m_2v_2=0$

$v_2=-\frac{m_1(-v_1)}{m_2} =-\frac{1.5\times -0.27}{4.5} =0.09\ m/s$

So the velocity of the cart on the right side that has a mass of $4.5\ kg$ is $0.09\ ms^{-1}$

4 0

4 years ago

12 seconds after starting from rest a frewly falling cantaloupe has a speed of

adoni [48]

Answer:

<em>The cantaloupe has a speed of 117.6 m/s</em>

Explanation:

<u>Free Fall Motion</u>

It occurs when an object falls under the sole influence of gravity. Any object that is being acted upon solely by the force of gravity is said to be in a state of free fall. Free-falling objects do not face air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.8 m/s^2$ .

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The cantaloupe has been dropped from rest. We are required to find the speed after t=12 seconds.

Calculate the final speed:

vf=9.8 * 12 = 117.6 m/s

The cantaloupe has a speed of 117.6 m/s

3 0

3 years ago

A block of ice is floating in a cup of water. It is 0.5 cm above the water surface and its length

Lapatulllka [165]

Answer:

Let the volume of the cube be V and the fraction of cube outside water be f.

Thus, volume of ice inside water = volume of water displaced =(1−f)V

Under equilibrium,

Weight of ice = Weight of water displaced

⟹Vρ

ice

g=(1−f)Vρ

water

⟹(1−f)=

⟹f=

Thus, the percentage of volume outside water =10%

6 0

3 years ago

A race car starts from rest, speeds up with constant acceleration, and reaches a final velocity of 140 m/s. What was the average

4vir4ik [10]

Answer:

$V_{average}=70m/s$

Explanation:

The average velocity is the distance traveled by an object divided by the time used to travel. Here you don't have the distance or the time, but the acceleration is constant so you can use this formula:

$V_{average}=\frac{v_i+v_f}{2}$

Where $v_i$ is the initial velocity and $v_f$ is the final velocity:

$V_{average}=\frac{v_i+v_f}{2}\\V_{average}=\frac{0+140}{2}\\V_{average}=\frac{140}{2}\\V_{average}=70m/s$

4 0

4 years ago

The electromagnetic wave shown above is made of vibrating

amid [387]

The electromagnetic wave shown above is made up of vibrating Electric fields.

I assume this is why electromagnetic waves can travel through a vacuum, due to lack of matter.

8 0

4 years ago