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3 years ago

Static electricity is

Physics

1 answer:

tigry1 [53]3 years ago

6 0

Answer:

Electrons traveling through insulators

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2. A 200-kg boulder has 39,200 joules of gravitational potential energy. What height is it at?

STatiana [176]

We have that the gravitational energy is given by: U=mgh where m is the mass of the object (in kg), g is the gravitational acceleration and h is the height of the object (in meters). Hence, h=U/(m*g) where g=9.8 m/s^2. Thus, h=20 m if we substitute.
Similarly, substituting in b, we have that the height of the model plane is 10 m. The kinetic energy is given by: K= $\frac{1}{2} *m*u^2$ where u is the speed of the object. Hence, solving for u we have u= $\sqrt{2K/m}$ . Substituting, we have that u=5m/s.

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3 years ago

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Energy that is associated with the position or composition of an object is called

Pani-rosa [81]

That is potential energy.

4 0

3 years ago

Solid are _______, usually in a regular repeating pattern

Temka [501]

Answer:

particles or arranged will be the answer depending on the previous line.

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3 years ago

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I dont understand how to find the blanks

Amiraneli [1.4K]

The forces are:

$F_{grav} = 98,000 N$ , down

$F_{net} = 80,000 N$ , down

$F_{air}=18,000 N$ , up

Explanation:

We start by finding the force of gravity on the elephant, $F_{grav}$ , which is given by

$F_{grav}=mg$ (downward)

where

m = 10,000 kg is the mass of the elephant

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$F_{grav}=(10,000)(9.8)=98,000 N$

Now we know that the net acceleration of the elephant is

$a_{net}=8.0 m/s^2$ downward

We can now use Newton's second law:

$F_{net}=ma_{net}$

where $F_{net}$ is the net force on the elephant. Substituting, we find

$F_{net}=(10,000)(8.0)=80,000 N$

and it also acts downward, since it has the same direction as the acceleration.

Finally, we can write the net force on the elephant as

$F_{net}=F_{grav}-F_{air}$

where the force of gravity acts downward, while the air resistance ( $F_{air}$ acts upward. The net force also acts downward, so it has the same sign of gravity.