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3 years ago

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Semiconductors are materials that conduct electric current better than insulators but not as well as conductors.Semiconductors a

re materials that conduct electric current better than insulators but not as well as conductors. This is TRUE.

1 answer:

Lina20 [59]3 years ago

3 0

Yes ! it is absolutely true.

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You are a detective investigating why someone was hit on the head by a falling flowerpot. One piece of evidence is a smartphone

umka21 [38]

Answer:

0.37 m

Explanation:

Given :

Window height, $h_1$ = 1.27 m

The flowerpot falls 0.84 m off the window height, i.e.

$h_2$ = (1.27 x 0.84 ) m in a time span of $t=\frac{8}{30}$ seconds.

Assuming that the speed of the pot just above the window is v then,

$h_2=ut+\frac{1}{2}gt^2$

$(1.27 \times 0.84) = v \times \left( \frac{8}{30} \right) + \frac{1}{2} \times 9.81 \times \left( \frac{8}{30} \right)^2$

$v=\left(\frac{30}{8}\right) \left[ (1.27 \times 0.84) - \left( \frac{1}{2} \times 9.81 \times \left( \frac{8}{30 \right)^2 \right) \right]}$

$v= 2.69$ m/s

Initially the pot was dropped from rest. So, u = 0.

If it has fallen from a height of h above the window then,

$h = \frac{v^2}{2g}$

$h = \frac{(2.69)^2}{2 \times 9.81}$

h = 0.37 m

3 0

3 years ago

Draw the vector C⃗ =A⃗ +2B⃗ .

spin [16.1K]

Answer:

A) C is 2 units towards right

B) C is 9 units towards right and 3 units towards up

C) C is 4 units towards right and 1 unit towards down

Explanation:

Drawings are given in the attachment.

A)Since,

A is 4 units towards right,

B is 1 unit towards left,

Then,

C is 2 units towards right.

B) Since,

A is 4 units towards right and 2 units towards up,

B is 1 unit towards left,

Then,

C is 9 units towards right and 3 units towards up.

C) Since,

A is 4 units towards right and 2 units towards up,

B is 1 unit towards right, and 1 unit towards down

Then,

C is 4 units towards right and 1 unit towards down.

4 0

4 years ago

Is an aquarium a system ?

sweet [91]

No

Explanation:Brooo it does not contribute to the eco system

6 0

3 years ago

A 20 kg girl runs up the staircase to a floor 4 m higher in 5 seconds. Whats her power output?

Zina [86]

Answer:

Explanation:

P = mgh/t = 20(9.8)(4) / 5 = 156.8 W(atts)

6 0

2 years ago

Se lanza una pelota de hule elástica de masa mA con una velocidad VAi contra la puerta trasera de un camión muy pesado de masa m

miv72 [106K]

Answer:

$v_{A}=v_{Ai}$

Explanation:

The total momentum of the system must conserve by the law of momentum conservation.

$p_b=p_a\\\\m_Av_{Ai}+m_Bv_{Bi}=m_Av_{A}+m_Bv_{B}$ ( 1 )

If you consider the shock between the ball and the truck as totally elastic, and also if the truck is much more massive than the ball, you can assume that the truck does not move when the ball hits it.

Then the truck is always at rest

Hence, you have in the expression ( 1 ):

$m_Av_{Ai}+0=m_Av_{A}+0\\\\v_{Ai}=v_{A}$

3 0

3 years ago