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3 years ago

Is everyone in your class able to hear a quiet sound equally well?

Physics

1 answer:

Sergio039 [100]3 years ago

8 0

Answer:

Explanation:

Loudness describes how people perceive sound (see loudness). ... If people could hear equally well at all frequencies, the contour lines would be flat because the same measured sound intensity would be perceived to be equally loud regardless of the sound frequency. In fact, people do not hear as well at low frequencies.

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A uniform electric field of magnitude 112 kV/m is directed upward in a region of space. A uniform magnetic field of magnitude 0.

notsponge [240]

Answer:

$1.37\cdot 10^5 m/s$

Explanation:

The beam of positively charged particles would not be deflected if the electric force acting on them is equal to the magnetic force:

$F_E = F_B\\qE = qvB sin \theta$

where

q is the charge of the particles

E is the magnitude of the electric field

v is the speed of the particles

B is the intensity of the magnetic field

$\theta$ is the angle between the direction of v and B

Since the beam of particles travels perpendicular to the magnetic field, we have $\theta=90^{\circ}, sin \theta=1$ . So, we can rewrite the equation as

$v=\frac{E}{B}$

where

$E=112 kV/m = 1.12\cdot 10^5 V/m\\B=0.82 T$

Substituting into the formula,

$v=\frac{1.12\cdot 10^5 V/m}{0.82 T}=1.37\cdot 10^5 m/s$

4 0

3 years ago

Supporting your answer with a diagram, explain how a thermistor is used to determined the temperature of water at a depth of 200

Darya [45]

Hey hebdhhdhdhdhsksjkssisjshvscscscscsggs

3 0

3 years ago

A plate of uniform areal density is bounded by the four curves: where and are in meters. Point has coordinates and . What is the

Natali5045456 [20]

The question is incomplete. The complete question is :

A plate of uniform areal density $\rho = 2 \ kg/m^2$ is bounded by the four curves:

$y = -x^2+4x-5m$

$y = x^2+4x+6m$

$x=1 \ m$

$x=2 \ m$

where x and y are in meters. Point $P$ has coordinates $P_x=1 \ m$ and $P_y=-2 \ m$ . What is the moment of inertia $I_P$ of the plate about the point $P$ ?

Solution :

Given :

$y = -x^2+4x-5$

$y = x^2+4x+6$

$x=1$

$x=2$

and $\rho = 2 \ kg/m^2$ , $P_x=1 \$ , $P_y=-2 \$ .

So,

$dI = dmr^2$

$dI = \rho \ dA \ r^2$ , $r=\sqrt{(x-1)^2+(y+2)^2}$

$dI = (\rho)((x-1)^2+(y+2)^2)dx \ dy$

$I= 2 \int_1^2 \int_{-x^2+4x-5}^{x^2+4x+6}((x-1)^2+(y+2)^2) dy \ dx$

$I= 2 \int_1^2 \int_{-x^2+4x-5}^{x^2+4x+6}(x-1)^2+(y+2)^2 \ dy \ dx$

$I=2 \int_1^2 \left( \left[ (x-1)^2y+\frac{(y+2)^3}{3}\right]_{-x^2+4x-5}^{x^2+4x+6}\right) \ dx$

$I=2 \int_1^2 (x-1)^2 (2x^2+11)+\frac{1}{3}\left((x^2+4x+6+2)^3-(-x^2+4x-5+2)^3 \ dx$

$I=\frac{32027}{21} \times 2$

$= 3050.19 \ kg \ m^2$

So the moment of inertia is $3050.19 \ kg \ m^2$ .

4 0

3 years ago

What is the ball's acceleration?

muminat

Answer:

g, downward

Explanation:

It is given that, a baseball is thrown straight upward. The force acting on the stone is force of gravity. It is moving under the action of gravity. We know that the force of gravity always acts in a downward direction.

At the highest point, the velocity of the stone will be equal to 0. It will move will constant acceleration equal to g and it always acts in downward direction.

Hence, the correct option is (e) "downward direction".

5 0

3 years ago

I have 22 electrons; how many protons and neutrons do I have?

Vsevolod [243]

Answer:

11 electrons & 11 neutrons

Explanation:

8 0

4 years ago