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3 years ago

True or False. A loud noise gives off less energy than a quiet noise.

Physics

2 answers:

zvonat [6]3 years ago

5 0

Answer:

true

Explanation:

hope it helped you

Zielflug [23.3K]3 years ago

4 0

Answer:

True

Explanation:

A loud noise cancels out

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In a ballistic pendulum, a spring pushes a ball from rest It ies through the air and sticks in the base of a pendlum that swings

Marysya12 [62]

Answer:

The final velocity is $\bf{562.9}$ .

Explanation:

Given:

The maximum angle that the pendulum and the ball system can travel, $\theta_{m} = 45^{0}$ .

The length of the pendulum, $l = 30~cm$ .

The mass of the pendulum, $m_{p} = 250~g$ .

The mass of the ball, $m_{b} = 76~g$ .

Consider that the initial velocity of the ball-pendulum system is $v_{i}$ . So the initial total energy of the system is given by

$E_{i} = K.E. + P.E.\\~~~~= \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2} + 0\\~~~~= \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2}$

Consider the final velocity of the ball is $v_{0}$ and the final height attended by the system is $h$ . So the final total final energy of the system is given by

$E_{f} = K.E. + P.E.\\~~~~~= 0 + (m_{b} + m_{s})gh\\~~~~~= (m_{b} + m_{s})gh$

From the conservation of energy,

$E_{i} = E_{f}\\&or,& \dfrac{1}{2}(m_{b} + m_{s})v_{i}^{2} = (m_{b} + m_{s})gh\\&or,& v_{i} = \sqrt{2gh}$

From the conservation of momentum,

$&& m_{b}v_{0} = (m_{b} + m_{s})v_{i}\\&or,& v_{0} = (1 + \dfrac{m_{p}}{m_{b}})\sqrt{2gh}$

The final height attended by the system is given by

$h = l(1 - \cos 45^{0}) = 8.787~cm$

The final velocity is given by

$v_{0} = (1 + \dfrac{250}{76}})\sqrt{2(980)(8.787)}\\~~~~= 562.9$

7 0

4 years ago

A solid cube of aluminum (density of 2.7 g/cm³) has a volume of 0.9 cm³. how many atoms are contained in the cube?

Reika [66]

Answer:

$0.542*10^{23}\ Aluminum\ Atoms$

Explanation:

$We\ are\ given:\\Density\ of\ aluminum=2.7\ g/cm^3\\Volume\ of\ aluminum-cube=0.9\ cm^3\\Hence,\\As\ we\ know\ that,\\Density=\frac{Mass}{Volume}\\Mass=Density*Volume\\Hence,\ here,\\Mass\ of\ the\ solid\ iron\ cube=2.7*0.9=2.43\ g\\Now,\\We\ also\ know\ that,\\Gram\ Atomic\ mass\ of\ Aluminum = 26.98 \approx 27\ g\\Hence,\\No.\ of\ particles=\frac{Mass}{GAM}*Avagadro's Constant\\Hence,\ here\\No.\ of\ Aluminum\ atoms=\frac{2.43}{27}*6.022*10^{23} \approx 0.542*10^{23}\ Aluminum\ Atoms$

8 0

3 years ago

Defind wave.then explain how vibrations,waves,and energy are related to sound

vagabundo [1.1K]

Waves are either transversal stereotypical pictures of waves or longitudinal it goes in rings waves are just different forms of vibration of any kind of energy

7 0

3 years ago

Read 2 more answers

4.72 A full-wave bridge-rectifier circuit with a 1-k load operates from a 120-V (rms) 60-Hz household supply through a 12-to-1 s

melisa1 [442]

Answer:

a) 12.74 V

b) Two pairs of diode will work only half of the cycle

c) 8.11 V

d) 8.11 mA

Explanation:

The voltage after the transformer is relationated with the transformer relationshinp:

$V_o=Vrms*\frac{1}{12}\\V_o=10Vrms$

the peak voltage before the bridge rectifier is given by:

$V_{op}=Vo*\sqrt{2}\\V_{op}=14.14V$

The diodes drop 0.7v, when we use a bridge rectifier only two diodes are working when the signal is positive and the other two when it's negative, so the peak voltage of the load is:

$V_l=V_{op}-2(0.7)\\V_l=12.74V$

As we said before only two diodes will work at a time, because the signal is half positive and half negative,so two of them will work only half of the cycle.

The averague voltage on a full wave rectifier is given by:

$V_{avg}=2*\frac{V_l}{\pi}\\V_{avg}=8.11V$

Using Ohm's law:

$I_{avg}=\frac{V_{avg}}{R}\\\\I_{avg}=8.11mA$

7 0

3 years ago

A small plane flies at 200 km/h in still air. If the wind blows directly out of the west at 50.0 km/h, (a) in what direction mus

GenaCL600 [577]

Answer:

a)θ=74.03° (N-E)

b)t=1.56 hr

Explanation:

Given that

Plane speed = 200 km/h

Wind speed = 55 km/h

Now from diagram

V is the resultant velocity of plane

$200^2=V^2+55^2$

V=192.28 km/h towards north

From triangle ABC

$cos\theta =\dfrac{55}{200}$

θ=74.03°

Given that

d=300 km

We know that

d = V x t

300 = 192.28 x t

t=1.56 hr

7 0

3 years ago

True or False. A loud noise gives off less energy than a quiet noise.​

True or False. A loud noise gives off less energy than a quiet noise.