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3 years ago

Why are certain metalloids useful in today's technological equipment?

Physics

1 answer:

fgiga [73]3 years ago

8 0

The answer is B.

Metalloids are elements that posses some of the characteristics of non-metals and also some of the characteristics of metals.

The semiconductivity property of metalloids such as Siliconium, Geranium have been leveraged to the maximum and these are used in LCD screens, televisions and many other technological appliances.

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an force of 5N is applied to a 10 kg object over a time of 3s. Determine the impulse applied to the object

ddd [48]

Answer:

15Ns

Explanation:

Given parameters:

Mass of the object = 10kg

Force impact = 5N

Time of action = 3s

Unknown:

Impulse applied on the object = ?

Solution:

Impulse is the force that acts on object within a period of time.

Mathematically;

Impulse = Force x time

Now insert the parameters and solve;

Impulse = 5 x 3 = 15Ns

7 0

3 years ago

The 15 g head of a bobble-head doll oscillates in SHM at a frequency of 4.0 Hz.

Goshia [24]

Answer:

(a) 9.375 N/m

(b) 0.5024 m/s

Explanation:

mass of head, m = 15 g = 0.015 kg

frequency, f = 4 Hz

Time period, T = 1 / f = 0.25 s

Let k is the spring constant.

(a)

The formula for the time period is

$T=2\pi\sqrt{\frac{m}{K}}$

$0.25=2\times 3.14 \sqrt{\frac{0.015}{K}}$

$0.04=\sqrt{\frac{0.015}{K}}$

K = 9.375 N/m

(b)

Amplitude, A = 2 cm

Let ω is the angular velocity.

Maximum velocity, v = A ω = A x 2πf

v = 0.02 x 2 x 3.14 x 4 = 0.5024 m/s

(c)

Let b is the damping constant.

A(t = 4s) = 0.5 cm

Ao = 2 cm

Using the formula of damping

$\frac{A}{A_{0}}=e^{-\frac{bt}{2m}}$

$\frac{0.5}{2}}=e^{-\frac{b\times 4}{2\times 0.015}}$

$0.25=e^{-133.3 b}$

Taking natural log on both the sides

ln (0.25) = - 133.3 b

- 133.3 b = - 1.386

b = 0.01 kg/s

3 0

3 years ago

A 1750 kg Ford Mustang Convertible and a 2222 kg Dodge Ram 4x4 truck were involved in a head on car crash. The Mustang initially

Zepler [3.9K]

Answer:

-1.3 m/s

Explanation:

It won't allow me submit, so be good to check the attachment

3 0

3 years ago

4) A force is applied to an object and causes and acceleration of 2.4 m/s2. The same force is

galina1969 [7]

Explanation:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration

7 0

3 years ago

Why does a Parallel Circuit still continue to function after a switch turns off one bulb but continues to pass through the secon

sertanlavr [38]

Explanation:

In short, when we switch off a branch, the remaining branch still forms a complete circuit with the battery, so electricity still pass through the remaining branch.

Technically speaking, the voltage in each branch is the same, and the resistance of the light bulb remains unchanged (neglect effect of temp.) by V=IR, the current should remain unchanged after switching off the other branch.

6 0

3 years ago