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3 years ago

Amber was used by the greeks to study _____

2 answers:

4 0

The correct answer that would best complete the given statement above would be option B. MAGNETISM. Amber was used by the Greeks to study MAGNETISM. Amber is a hard, fossilized resin produced by extinct coniferous trees of the Tertiary period. Hope this answer helps you.

Mandarinka [93]3 years ago

3 0

Answer:

C ) Electric charge.

Explanation:

Amber is used in the experiments related to static electricity.

In electrostatics, elektron was the word used as a variation to amber, by the Greeks. Amber buttons, when rubbed with cloth, attracted hair.

Studies showed that when amber is rubbed with fur, fur became negatively charged and amber became positively charged. That is because amber loses its electrons to fur.

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A simple pendulum has a period of 3.45 second, when the length of the pendulum is shortened by 1.0m, the period is 2.81 second c

den301095 [7]

Answer:

Original length = 2.97 m

Explanation:

Let the original length of the pendulum be 'L' m

Given:

Acceleration due to gravity (g) = 9.8 m/s²

Original time period of the pendulum (T) = 3.45 s

Now, the length is shortened by 1.0 m. So, the new length is 1 m less than the original length.

New length of the pendulum is, $L_1=L-1$

New time period of the pendulum is, $T_1=2.81\ s$

We know that, the time period of a simple pendulum of length 'L' is given as:

$T=2\pi\sqrt{\frac{L}{g}}$ -------------- (1)

So, for the new length, the time period is given as:

$T_1=2\pi\sqrt{\frac{L_1}{g}}$ ------------ (2)

Squaring both the equations and then dividing them, we get:

$\dfrac{T^2}{T_1^2}=\dfrac{(2\pi)^2\frac{L}{g}}{(2\pi)^2\frac{L_1}{g}}\\\\\\\dfrac{T^2}{T_1^2}=\dfrac{L}{L_1}\\\\\\L=\dfrac{T^2}{T_1^2}\times L_1$

Now, plug in the given values and calculate 'L'. This gives,

$L=\frac{3.45^2}{2.81^2}\times (L-1)\\\\L=1.507L-1.507\\\\L-1.507L=-1.507\\\\-0.507L=-1.507\\\\L=\frac{-1.507}{-0.507}=2.97\ m$

Therefore, the original length of the simple pendulum is 2.97 m

4 0

3 years ago

What is Brewster's angle for an air-glass n = 1.58 surface

arlik [135]

n₂ = index of refraction of glass = 1.58

n₁ = index of refraction of air = 1

θ = Brewster's angle

Brewster's angle is that incident angle at which the the reflected light from the interface of two medium is completely polarized.

Brewster's angle is given as

θ = tan⁻¹(n₂ /n₁ )

θ = tan⁻¹(1.58/1 )

θ = 57.7 deg

hence the Brewster's angle comes out to be 57.7 deg

4 0

3 years ago

What is a watt second

Rzqust [24]

1 watt is a RATE of using energy ... 1 Joule per second. If you use energy at the RATE of 1 watt and keep it up for 1 whole second, you've used 1 whole Joule of energy. 1 watt-second = 1 Joule .

3 0

3 years ago

Explain how the gas laws apply to the act of breathing. Describe the changes that occur in each step of the process in terms of

MrRa [10]

When you in inhale, you move your diaphragm down increasing the volume of the cavity in your ribs (its called pleural cavity). This lowers the pressure inside your lungs. When the pressure in your lungs is less than the atmospheric pressure, air draws inwards. Ideal gas law: PV=nRT -> assume nRT are constant for our purposes. then we allow one system to be equal to the same system at different conditions, thus: P1V1=P2V2 (Boyles Law) assume P1=1 atm and V1=1 L (keeping the numbers simple to avoid confusion). when the V is increased (for example say doubled) V2=2 L, then: (1 atm)*(1 L)=P2*(2 L) -> P2=0.5 atm The pressure was decreased. Apply the same logic for exhalation.

4 0

3 years ago

Which statement is true of a wave that’s propagating along the pavement and girders of a suspension bridge?

Readme [11.4K]

Had to look for the options and here is my answer.
The statement that is considered correct regarding a wave that is propagating along the pavement and girders of a suspension bridge is this: "the wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming compressions and rarefactions." Hope this helps.

3 0

4 years ago