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soldi70 [24.7K]
3 years ago
6

A mass on the end of a spring undergoes simple harmonic motion. At the instant when the mass is at its maximum displacement from

equilibrium, what is its instantaneous acceleration?
a. At maximum displacement, its instantaneous acceleration is zero.
b. At maximum displacement, its instantaneous acceleration is less than its maximum but not zero.
c. At maximum displacement, its instantaneous acceleration is also at maximum.
d. Instantaneous acceleration cannot be determined without additional information.
Physics
1 answer:
hodyreva [135]3 years ago
5 0

Answer:

C. At maximum displacement, its instantaneous acceleration is also at maximum.

Explanation:

Lets take

The general equation of the SHM  

Displacement

x= A sinω t

velocity

V=  Aω cosω t

Acceleration

a= -Aω² sinω t

Form the above we can say that displacement and the acceleration are in the same phase.

Therefore when displacement is maximum then acceleration also will be maximum.

Therefore the answer is C.

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A traveling electromagnetic wave in a vacuum has an electric field amplitude of 93.3 V/m. Calculate the intensity S of this wave
7nadin3 [17]

Answer:

Intensity = 11.56W/m²

The energy flowing through the given area is 4.55 J

Explanation:

The expression for the intensity of the electromagnetic wave is,

I = \frac{1}{2} C{ {\varepsilon _0}E_m^2

Here,\varepsilon _0 is the permittivity of the free space,

E_m  is the electric field amplitude and

c is the speed of the light.

substitute

⁸m/s for c

8.85×10  −12  C² /N⋅m² for {\varepsilon _0}

and 93.3 V/m for {E_{\rm{m}

I = \frac{1}{2} \times (3\times10^8)\times(8.85\times10^-^1^2)(93.3)\\\\I = 11.56W/m^2

The expression for the energy is,

E = I×A×t

Here, I is the intensity of the electromagnetic wave,

A is the area, and

t is the time.

Substitute

11.56W/m² for I

0.0287m ² for A

13.7s for t

E = (11.56)\times(0,0287)\times(13.7)\\E = 4.55J

The energy flowing through the given area is 4.55 J

5 0
4 years ago
1. Determina el momento que produce una fuerza de 7 N tangente a una rueda de un metro de diámetro, sabiendo que el punto de apl
Rudik [331]

Answer:

τ= F r     into the blade

Explanation:

The moment of a force is defined by

         τ = F x r

where the bold indicates vectors

Let us write in the expression in magnitude

         τ = F r sin θ

in our case the force is tangent to the wheel therefore the angle between F and the radius is 90º, and the sin 90 = 1

       τ= F r

The direction of τ can be used by the rule of the right hand, the fingers curve in the direction of the torque when advancing from the force to the radius and the thumb points in the direction of the torque.

In this case, for a clockwise rotation, the fingers are curved in the direction and the thumb points into the blade, this is the direction of the τ.

TRASLATE

El momento de una fura es definido por

         τ = F x r

donde la negrillas indican vectores

Escribamos en ta expresión en magnitud

          τ = F r sin θ

en nuestro caso la fuerza es tangente a la rueda por lo tanto el angulo entre F y el radios es 90º, y el sin 90=1

        τ = F r

la dirección de tau la podemos  usar la regla de la mano derecha, los dedos curva en la dirección del torque al avanzar dese la fuerza al radio y el pulgar apunta en la dirección del torque.

En este caso para un giro en sentido horario los dedos se curvan ente sentido y el pulgar apunta hacia dentro de lla hoja, esta es la dirección del troque

5 0
4 years ago
A standing wave on a string that is fixed at both ends has frequency 80.0 Hz. The distance between adjacent antinodes of the sta
OlgaM077 [116]

Answer:

v = 19.2 m/s

Explanation:

In order to find the speed of the string you use the following formula:

f=\frac{v}{2L}          (1)

f: frequency of the string = 80.0Hz

v: speed of the wave = ?

L: length of the string = 12.0cm = 0.12m

The length of the string coincides with the wavelength of the wave for the fundamental mode.

Then, you solve for v in the equation (1), and replace the values of the other parameters:

v=2Lf=2(0.12m)(80.0Hz)=19.2\frac{m}{s}

The speed of the wave is 19.2 m/s

8 0
4 years ago
How much work does a 65 kg gymnast have to do to climb a rope to a height of 7? meters? PLEASE HURRY ITS A TEST​
Karo-lina-s [1.5K]
How much force did the gymnast use to climb the rope?
4 0
3 years ago
Which characteristic do all minerals have in common?
Korolek [52]

Answer:

Five Characteristics of a Mineral

Minerals Are Natural. You must find minerals in nature; substances concocted in laboratories don't qualify. ...

Minerals Are Inorganic. ...

Minerals Are Solids. ...

Definite Chemical Composition. ...

Crystalline Structure.

These are just some examples.

Explanation:

7 0
3 years ago
Read 2 more answers
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