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3 years ago

Frequency more than 20,000 HZ

Physics

2 answers:

Ilya [14]3 years ago

6 0

Answer:

dvhd

Explanation:

xhxjjdvcbxhjddvifidid

Leviafan [203]3 years ago

5 0

Answer:

The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound

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At what position or positions on the x-axis is the electric field zero?

ElenaW [278]

Answer:

The electric field will be zero at x = ± ∞.

Explanation:

Suppose, A -2.0 nC charge and a +2.0 nC charge are located on the x-axis at x = -1.0 cm and x = +1.0 cm respectively.

We know that,

The electric field is

$E=\dfrac{kq}{r^2}$

The electric field vector due to charge one

$\vec{E_{1}}=\dfrac{kq_{1}}{r_{1}^2}(\hat{x})$

The electric field vector due to charge second

$\vec{E_{2}}=\dfrac{kq_{2}}{r_{2}^2}(-\hat{x})$

We need to calculate the electric field

Using formula of net electric field

$\vec{E}=\vec{E_{1}}+\vec{E_{2}}$

$\vec{E_{1}}+\vec{E_{2}}=0$

Put the value into the formula

$\dfrac{kq_{1}}{r_{1}^2}(\hat{x})+\dfrac{kq_{2}}{r_{2}^2}(-\hat{x})=0$

$\dfrac{kq_{1}}{r_{1}^2}(\hat{x})=\dfrac{kq_{2}}{r_{2}^2}(\hat{x})$

$(\dfrac{r_{2}}{r_{1}})^2=\dfrac{q_{2}}{q_{1}}$

$\dfrac{r_{2}}{r_{1}}=\sqrt{\dfrac{q_{2}}{q_{1}}}$

Put the value into the formula

$\dfrac{2.0+x}{x}=\pm\sqrt{\dfrac{2.0}{2.0}}$

$2.0+x=x$

If x = ∞, then the equation is be satisfied.

Hence, The electric field will be zero at x = ± ∞.

4 0

4 years ago

A first year student projected a farm business brochure to a farmer at 30 degrees to horizontal. calculate the maximum height at

IceJOKER [234]

Answer:

Maximum height = 2040 m

Explanation:

We can solve the problem using kinematics.

Consider the vertical motion of the object and use the equation:

$\boxed{v^2 = u^2 + 2as}$

where:

• v = final velocity (0 m/s, because when the object is at max. height, it has no vertical velocity)

• u = initial velocity (400sin30° m/s ⇒ vertical component of 400 m/s at 30° to horizontal)

• a = acceleration (-9.81 m/s²; considering upward acceleration to be negative)

• s = displacement (? m; this represents the max. height of the object),

Substitute the values into the equation and solve for s :

$0^2 = (400 sin (30 \textdegree))^2 + 2(-9.81)(s)$

⇒ $2(9.81)(s) = (400 sin (30 \textdegree))^2$

⇒ $s = 2040 \space\ m$ (3 s.f.)

6 0

2 years ago

Help me and you will meet your favorite singer at your door.

Goshia [24]

Sunlight, because it provides a source of energy is the answer because plants also provide a food source (please put as brainliest answer)

4 0

3 years ago

Read 2 more answers

if you have a kinetic energy of 1470 J, and you are 60kg mass and 0 m above the ground, what is you velocity?

laiz [17]

Answer:

The 39.

Explanation:

8 0

3 years ago

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An elevator motor in a high-rise building can do 3500 kJ of work in 5 min. Find the power developed by the motor. Explain if you

Ilya [14]

Answer:

P = 11666.6 W

Explanation:

Given that,

Work done by the motor, W = 3500 kJ

Time, t = 5 min = 300 s

We need to find the power developed by the motor. Power developed is given by :

$P=\dfrac{E}{t}\\\\P=\dfrac{3500\times 10^3}{300}\\\\P=11666.7\ W$

So, the required power is 11666.6 W.

4 0

3 years ago

Frequency more than 20,000 HZ​

Frequency more than 20,000 HZ