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3 years ago

What are three things that transfer energy by sound

Physics

2 answers:

Sergio039 [100]3 years ago

7 0

3 things that transfer energy by sound is a plucking guitar strings,speakin into a microphone and banging a drum

Bezzdna [24]3 years ago

5 0

1. Hair dryer. 2. A tv. 3. Radio

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Adolf and Ed are wearing harnesses and are hanging at rest from the ceiling by means of ropes attached to them. Face to face, th

exis [7]

Answer:

0.78 m

Explanation:

By the conservation of energy, the energy that they gain from potential energy, must be equal to the kinetic energy. So, for Adolf:

Ep = Ek

ma*g*ha = ma*va²/2

Where ma is the mass of Adolf, g is the gravity acceleration (10 m/s²), ha is the height that he reached, and va is the velocity. So:

100*10*0.51 = 100*va²/2

50va² = 510

va² = 10.2

va = √10.2

va = 3.20 m/s

Before the push, both of them are in rest, so the momentum must be 0. The system is conservative, so the momentum after the push must be equal to the momentum before the push:

ma*va + me*ve = 0, where me and ve are the mass and velocity of Ed. So:

100*3.20 + 81ve = 0

81ve = 320

ve = 3.95 m/s

By the conservation of energy for Ed:

me*g*he = me*ve²/2

81*10*he = 81*(3.95)²/2

810he = 631.90

he = 0.78 m

5 0

3 years ago

Calculate the acceleration of a student riding his bicycle in a straight line that speeds up from 4 m/s to 6 m/s in 5 seconds.

solong [7]

Acceleration is equal to velocity final minus velocity initial divided by time. 6m/s minus 4m/s divided by 5 seconds is 0.4m/s^2.

7 0

3 years ago

A Texas cockroach of mass 0.117 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical a

kozerog [31]

Answer

given,

mass of cockroach = 0.117 Kg

radius = 17.3 cm

rotational inertia = 5.20 x 10⁻³ Kg.m²

speed of cockroach = 1.91 m/s

angular velocity of Susan (ω₀)= 2.87 rad/s

final speed of cockroach = 0 m/s

Initial angular velocity of Susan

L_s = I ω₀

L_s = 5.20 x 10⁻³ x 2.87

L_s=0.015 kg.m²/s

initial angular momentum of the cockroach

L_c = - mvr

L_c = - 0.117 x 1.91 x 0.173

L_c = - 0.0387 kg.m²/s

total angular momentum of Both

L = 0.015 - 0.0387

L = - 0.0237 kg.m²/s

after cockroach stop inertia becomes

I_f = I + mr^2

I_f = 5.20 x 10⁻³+ 0.117 x 0.173^2

I_f = 8.7 x 10⁻³ kg.m²/s

final angular momentum of the disk

L_f = I_f ω_f

L_f = 8.7 x 10⁻³ x ω_f

using conservation of momentum

L_i = L_f

-0.0237 =8.7 x 10⁻³ x ω_f

$\omega_f = \dfrac{-0.0237}{8.7 \times 10^{-3}}$

$\omega_f = -2.72\ rad/s$

angular speed of Susan is $\omega_f = -2.72\ rad/s$

The value is negative because it is in the opposite direction of cockroach.

$|\omega_f |= 2.72\ rad/s$

b) the mechanical energy is not conserved because cockroach stopped in between.

7 0

3 years ago

Which of the following statements accurately describes the properties gases

lana [24]

2 they are easy to compress,

2 they expand to fill their containers,

3 they occupy far more space than the liquids or solids from which they form.

hope this helped!

5 0

3 years ago

Read 2 more answers

. The speedometer readings of a car are shown below. Find the acceleration of the car and its displacement.

Alchen [17]

It is given that u=36km/h

V= 72km/h

We have to convert it into m/s ao we will multiply it with 5/18

U=36×5/18=10

V=72×5/18=20

So acceleration =v-u/t

= 20-10/t

The time will be 9:45-9:25=20min

So we will convert it into second

= 20×60

a=20-10/20×60

=10/20×60

1/120

From newtons 2nd law

V^2-u^2=2as

S=v^2-u^2/2a

=400-100×120/2

=18000m/s

7 0

3 years ago