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VikaD [51]
3 years ago
14

Sometimes at a child's birthday party someone will rub a balloon on another's head and stick the balloon to the wall. this works

because
a.the wall and balloon have the same charge.
b.the balloon has less weight because it has become charged.
c.the balloon discharges current into the wall and the wall becomes charged just like the balloon was.
d.the wall and the balloon have opposite charges and this creates an attractive force between the wall and the balloon.
Physics
2 answers:
kogti [31]3 years ago
8 0
D). I hope this helped. :-)
OverLord2011 [107]3 years ago
4 0

Answer:

D

Explanation:

I took the test :P

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A rhinoceros beetle rides the rim of a disk rotating like a merry-go-round counterclockwise.
Pie

Answer:

a) The angular momentum remains constant because the system is isolated

b)  if the beetle walks

- In the direction of rotation of the disc, the angular velocity of the disc decreases.

-   If the beetle goes in the opposite direction] to the disk the angular velocity increases

Explanation:

The angular momentum is

           L = I w

For an isolated system the angular momentum must be preserved.

Let us define the system as formed by the beetle plus the disk, in this case when the beetle walks, the forces are an internal force (action and reaction), therefore the angular momentum is conserved. Let's write in two moments

Initial. Before the beetle movement

           L₀ = I w₀

Final. When the beetle is moving

          L_{f} = I w + I₂ w₂

The moment is preserved

           L₀ =  L_{f}

           I w₀ = I w + I₂ w₂

 

We cleared the final angular speed of the disk

          w = w₀ - w₂ I₂ / I

In general, the moment of inertia of the beetle is less than the moment of inertia of the disc and its angular velocity is also small.

Let's examine the questions.

a) The angular momentum remains constant because the system is isolated

b) The angular velocity of the system changes according to the previous equation, if the beetle walks

- In the direction of rotation of the disc, the angular velocity of the disc decreases.

-   If the beetle goes in the opposite direction] to the disk the angular velocity increases

8 0
3 years ago
Rearrange the equation = KE<br> -1<br> 2<br> - my? to solve for v. Show your work.
vesna_86 [32]

Answer:

See below

Explanation:

KE = 1/2 m v^2     multiply both sides by 2

2 (KE) = mv^2       divide both sides by m

2(KE) / m = v^2        sqrt both sides

√ [(2KE)/m ] = v

3 0
2 years ago
A 16 g rifle bullet traveling 240 m/s buries itself in a 3.6 kg pendulum hanging on a 2.5 m long string, which makes the pendulu
iren [92.7K]

Answer:

x = 0.54 m

y = 0.058 m

Explanation:

m = mass of the bullet = 16 g = 0.016 kg

v = speed of bullet before collision = 240 m/s

M = mass of the pendulum = 3.6 kg

L = length of the string = 2.5 m

h = height gained by the pendulum after collision

V = speed of the bullet and pendulum combination

Using conservation of momentum

m v = (m + M) V

(0.016) (240) = (0.016 + 3.6) V

V = 1.062 m/s

Using conservation of energy

Potential energy gained by bullet and pendulum combination = Kinetic energy of bullet and pendulum combination

(m + M) g h = (0.5) (m + M) V²

(9.8) h = (0.5) (1.062)²

h = 0.058 m

y = vertical displacement = h = 0.058 m

x = horizontal displacement

horizontal displacement is given as

x = sqrt(L² - (L - h)²)

x =  sqrt(2.5² - (2.5 - 0.058)²)

x = 0.54 m

8 0
3 years ago
Oque e um projeto de vida​
zavuch27 [327]

Answer:

bahasa Indonesia janga

8 0
3 years ago
Thorium-232 decays by alpha decay. Part of the nuclear equation is shown below. Fill in the blank with a number. 232/90
UkoKoshka [18]

its 228 on my apex......

8 0
3 years ago
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