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4 years ago

Is it possible for an atom to have an electric charge?

Physics

1 answer:

jeka57 [31]4 years ago

7 0

False an atom can not have an electric charge.

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A sound wave, with speed of 340 m/s has a frequency of 17,000 Hz. What

Fiesta28 [93]

Wavelength = speed / frequency = 340 / 17000 = 0.02 m

6 0

3 years ago

A wire with a linear mass density of 1.17 g/cm moves at a constant speed on a horizontal surface and the coefficient of kinetic

stira [4]

Answer:

The value is $B = 0.2312 \ T$

The direction is into the surface

Explanation:

From the question we are told that

The mass density is $\mu =\frac{m}{L} = 1.17 \ g/cm =0.117 kg/m$

The coefficient of kinetic friction is $\mu_k = 0.250$

The current the wire carries is $I = 1.24 \ A$

Generally the magnetic force acting on the wire is mathematically represented as

$F_F = F_B$

Here $F_F$ is the frictional force which is mathematically represented as

$F_F = \mu_k * m * g$

While $F_B$ is the magnetic force which is mathematically represented as

$F_B = BILsin(\theta )$

Here $\theta =90^o$ is the angle between the direction of the force and that of the current

$F_B = BIL$

$BIL = \mu_k * m * g$

=> $B = \mu_k * \frac{m}{L} * [\frac{g}{I} ]$

=> $B = 0.25 * 0.117 * [\frac{9.8}{1.24} ]$

=> $B = 0.2312 \ T$

Apply the right hand curling rule , the thumb pointing towards that direction of the current we see that the direction of the magnetic field is into the surface as shown on the first uploaded image

8 0

3 years ago

The foot pedal on hydraulic brake system exerts a force of 45 lb on a piston with a diameter of 1.00 cm. The brake fluid in the

ElenaW [278]

Answer:

the correct answer is C, 281 lb

Explanation:

This is an exercise in fluid mechanics specifically on Pascal's principle, which states that the pressure in a fluid is equal to all points that are at the same depth

P = $\frac{F_{1} }{A_{1} }$ = $\frac{F_{2} }{A_{2} }$

If we use the subscript 1 for the piston diameter mentor (d = 1.00vm) which is r = 0.05 cm, the force is F1 = 45 lb

F₂ = \frac{F_{1} }{A_{1} } F₁

in area of a circules

A = π r²

we substitute

F₂ = $\frac{r_{2}^2 }{r_{1}^2} F_{1}$

let's calculate

F2 = 2.50² / 1.00² 45

F2 =281 lb

therefore the correct answer is C

3 0

3 years ago

What is the angle o in the triangle below? (Hint: Use an inverse trigonometric<br> function.)

Margaret [11]

Answer:

Zero angle is possible geometrically in a right triangle when its length of opposite side is equal to zero. Due to zero length of opposite side, the length of hypotenuse is absolutely equal to the length of hypotenuse.

5 0

3 years ago

What is the potential energy of a 2500 g object suspended 5 kg above the earth's surface?

Alinara [238K]

Answer:

$potential \: energy = mgh \\ = ( \frac{2500}{1000} ) \times 10 \times 5 \\ = 125 \: newtons$

if height is 5 m

8 0

3 years ago