3 years ago

If we rub a rubber rod against a piece of fur the rod gains a negative change. Why does the rod have a negative charge?

Physics

1 answer:

Bingel [31]3 years ago

4 0

Answer:

because the rod takes electrons from the fur when rubbed across it

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A student uses an indicator to measure the pH of a solution. The indicator shows a pH of 7. What must be true of this solution?

Anna71 [15]

Answer:

The solution is neither acidic or basic,

PH < 7 acidic

PH = 7 neutral

PH > 7 basic

It is a measure of the (H+) hydronium concentration.

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2 years ago

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VladimirAG [237]

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2 years ago

Efficincy of simple machine is 60% what does it mean?<br>

umka2103 [35]

Explanation:

By the statement, Efficiency of a machine is 60% it is meant that 'The work output is 60% of the work input'. If you apply 100J of energy for a machine, it will be able to life load of 60 J only

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2 years ago

Young's double slit experiment is one of the classic tests for the wave nature of light. In an experiment using red light (λ = 6

Marianna [84]

Answer:

The separation distance between the slits is 16710.32 nm.

Explanation:

Given that,

Wavelength = 641 nm

Angle =4.4°

(a). We need to calculate the separation distance between the slits

Using formula of young's double slit

$d\sin\theta=m\lambda$

$d=\dfrac{m\lambda}{\sin\theta}$

Where, d = the separation distance between the slits

m = number of order

$\lambda$ =wavelength

Put the value into the formula

$d=\dfrac{2\times641\times10^{-9}}{\sin4.4}$

$d=0.00001671032\ m$

$d=16710.32\ nm$

Hence, The separation distance between the slits is 16710.32 nm.

3 0

3 years ago

What is the speed over the ground of an airplane flying at 100 km/h relative to the air caught in a 100-km/h right-angle crosswi

Rudiy27

Answer:

141.42 km/h

Explanation:

Since this is a 100km/h right angle crosswind, the speed vector with respect to the ground is the vector speed of the airplane with respect to air + the vector speed of the cross-wind with respect to the ground

<100,0> + <0,100> = <100,100>

This vector has a magnitude of

$v = \sqrt{v_1^2 + v_2^2} = \sqrt{100^2 + 100^2} = \sqrt{10000 + 10000} = \sqrt{20000} = 141.42$ km/h

4 0

3 years ago