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3 years ago

Free point giveaway pt.7 and brainliest to first answer

Physics

2 answers:

antiseptic1488 [7]3 years ago

7 0

Answer: a

Explanation: a

Dovator [93]3 years ago

7 0

Answer:

Thank you

Explanation: ooooooooo

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When an object such as a plastic comb is charged by rubbing it with a cloth, the net charge is typically a few microcoulombs. If

masya89 [10]

The concept required to solve this problem is quantization of charge.

First the number of electrons will be calculated and then the total mass of the charge.

With these data it will be possible to calculate the percentage of load in the mass.

$Q= ne$

Here Q is the charge, n is the number of electrons and e is the charge on the electron

$n = \frac{Q}{e}$

Replacing,

$n = \frac{4*10^{-6}C}{1.6*10^{-19}}$

$n = 2.5 * 10^{13}77$

According to the quantization of charge the charge is defined as product of the number of electron and the charge on the electron

The total mass of the charge is

$m= nm_e$

Here,

m = Mass of the charge

n = Number of electrons

$m_e$ = Mass of the electron

$\text{Percentage change} = \frac{nm_e}{M}*100$

Replacing we have

$\text{Percentage change} = \frac{(2.5*10^13)(9.1*10^{-28})}{33}*100$

$\text{Percentage change} = 6.9*10^{-14} \%$

6 0

4 years ago

How much work is done by the force of gravity when a 15 kilogram rock falls off of a bridge 20 meters high?

viktelen [127]

Work Done ( By Gravity) = Mg.H
= 15*10*20
=3 kJ

8 0

3 years ago

Consult Multiple-Concept Example 5 for insight into solving this problem. A skier slides horizontally along the snow for a dista

Gennadij [26K]

Answer:

The speed with which the skier was going is approximately 2.9906 m/s

Explanation:

The given parameters are;

The distance the skier slides before coming to rest, s = 12.4 m

The coefficient of friction between the skier and the snow, $\mu _k$ = 0.0368

Therefore, for conservation of energy, we have;

Initial kinetic energy = Work done by the kinetic friction force

Initial kinetic energy = 1/2·m·v²

The work done by the kinetic friction force = $\mu _k$ ×m×g×s

Where;

m = The mass of the skier

v = The speed with which the skier was going

g = The acceleration due to gravity = 9.8 m/s²

s = The distance the skier slides before coming to rest = 12.4 m

$\mu _k$ = The kinematic friction = 0.0368

Therefore, for conservation of energy, we have;

1/2·m·v² = $\mu _k$ ×m×g×s

1/2·v² = $\mu _k$ ×g×s

v² = 2× $\mu _k$ ×g×s = 2 × 0.0368 × 9.8 × 12.4 = 8.943872

v = √(8.943872) ≈ 2.99063070271 ≈ 2.9906 m/s

The speed with which the skier was going = v ≈ 2.9906 m/s.

3 0

3 years ago

Which electromagnetic wave has the longest wavelength?

Irina18 [472]

Radio waves have the longest wavelength

8 0

3 years ago

Read 2 more answers

Two narrow slits 84 mum apart are illuminated with light of wavelength 650 nm. What is the angle of the m = 3 bright fringe in r

Digiron [165]

Answer:

The angle is 1.33°.

Explanation:

Given that,

Distance $d=84\times10^{-6}\ m$

Wavelength = 650 nm

Number of fringe = 3

We need to calculate the angle

Using formula of angle for brightness

$d\sin\theta=m\lambda$

$\theta=\sin^{-1}\dfrac{m\lambda}{d}$

Where, d = distance

$\lambda$ =wavelength

m = number of fringe

Put the value into the formula

$\theta=\sin^{-1}\dfrac{3\times650\times10^{-9}}{84\times10^{-6}}$

$\theta=1.33^{\circ}$

Hence, The angle is 1.33°.

3 0

4 years ago