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3 years ago

How is a sound wave made by plucking a guitar string?.

Physics

2 answers:

frozen [14]3 years ago

8 0

Answer:

Because of the vibration of the string. since it is vibrating it will make the other air molecules vibrate as well and air vibrating is basically a sound wave.

timurjin [86]3 years ago

8 0

Answer:

A sound wave is produced by a vibrating object

Explanation:

When a guitar string vibrates, it sets surrounding air molecules into motion. The frequency of vibration of these air molecules is the same as that of a guitar string.

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You have a radioactive sample with a half-life of 1 hour. At t = 1 hour, a Geiger counter measures its radiation at 40 counts/mi

Mama L [17]

Answer:

Explanation:

Given that, .

The half-life of a radioactive element is

t½ = 1 hr.

At the first hour, the radioactive element has 40 counts/minute

After 4 hours it has 5 counts/minute

So,

We want to filled the table.

0 hours, I.e at the start

40 counts/mins × 2 = 80 counts / mis

First half-life (first hour) is

40 counts/mins

Second half-life (second hour)

40 counts/mins × ½ = 20 counts/mins

Third half-life (third hour)

40 counts/mins × ¼ = 10 counts / mins

Fourth half life (fourth hour)

40 counts/mins × ⅛ = 5 counts / mins

So, the table is

Time........................Geiger Counter Rate

0 hours.................... 80 counts / minutes

1 hour........................ 40 counts / minutes

2 hours..................... 20 counts / minutes

3 hours..................... 10counts / minutes

4 hours...................... 5 counts / minute

6 0

3 years ago

A 70.0-kilogram man is walking at a speed if 2.0 m/s. What is the kinetic energy?

Paraphin [41]

Answer:

140 J

Explanation:

From the the question, the mass of the man =70.0 kg and the speed at which the man is walking =2.0 m/s.

$K.E = \frac{1}{2}m {v}^{2}$

where K.E = the kinetic energy, m=mass and v= speed.

By substitution,

$K.E = \frac{1}{2} \times 70 \times {2}^{2}$

$\implies \: K.E = \frac{280}{2}$

$\implies K.E =140$

Hence the kinetic energy of the man is 140J

3 0

3 years ago

A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s while comin

Bogdan [553]

Answer: $1.53g$

Explanation:

average deceleration= ?

inial velocity: $u=0$

final velocity: $v=30m/s$

time: $t=2seconds$

The first law of kinematics :

$v=u+at$

find a the subject of the formula

$a=v-u/ t$

$a=\frac{0-30} 2$

$a=-30/2$

$a=-15m/s^{2}$

The deceleration about g(acceleration due to gravity) will be:

$15/9.8$

$1.53g$

4 0

3 years ago

A toy rocket is launched with an initial velocity of 10.0 m/s in the horizontal direction from the roof of a 38.0-m-tall buildin

Bas_tet [7]

Answer:

Explanation:

Consider downward displacement first .

downward displacement h = 38 m .

downward acceleration = g

downward initial velocity u = 0

h = ut + 1/2 g t ²

38 = 0 + 9.8 t ²

t = 1.97 s

During this period , there will be horizontal displacement with initial velocity u = 10 m /s and acceleration a = 1.6 m /s²

s = ut + 1/2 a t²

= 10 x 1.97 + .5 x 1.6 x 1.97²

= 19.7 + 3.10

= 22.8 m

3 0

3 years ago

A car that increase its speed from 20 km/h to 100 km/h undergoes -------acceleration,

stepladder [879]

negative acceleration- deceleration

8 0

4 years ago