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3 years ago

7

True or False?

1 answer:

olga nikolaevna [1]3 years ago

6 0

Answer:

False

Explanation:

It is better to be logical when proving a point

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A fisherman's scale stretches 3.7 cm when a 3.5 kg fish hangs from it. (a) what is the spring constant? n/m (b) what will be the

Karo-lina-s [1.5K]

(a) the weight of the fish is:
$W=mg=(3.5 kg)(9.81 m/s^2)=34.3 N$
and this is the force that stretches the spring by $x=3.7 cm=0.037 m$ . So, we can use Hook's law to find the constant of the spring:
$k= \frac{F}{x}= \frac{34.3 N}{0.037 m}=927.0 N/m$

(b) The fish is pulled down by 2.8 cm = 0.028 m more, so now the total stretch of the spring is
$x'=3.7 cm+2.8 cm=6.5 cm$
But this is also the amplitude of the new oscillation, because this is the maximum extension the spring can get, so A=6.5 cm.

The angular frequency of oscillation is given by:
$\omega= \sqrt{ \frac{k}{m} }= \sqrt{ \frac{927.0 N/m}{3.5 kg} }=16.3 Hz$
and so the frequency is given by
$f= \frac{\omega}{2 \pi} = \frac{16.3 Hz}{2 \pi}=2.6 Hz$

8 0

3 years ago

A bubble, located 0.200 m beneath the surface in a glass of beer, rises to the top. The air pressure at the top is 1.01x10⁵ Pa.

Cerrena [4.2K]

Answer:

$\frac{1.019}{1}$

Explanation:

To solve this equation we will have to consider that the bubble is filled with an Ideal Gas and as such we can use the Ideal Gas Law

$PV = nRT$

Where

$P$ = Pressure

$V$ = Volume

$n$ = Moles

$R$ = Ideal Gas Constant

$T$ = Temperature

Now since we know that the value for the temperature and moles is constant we can simply use Boyles Law for the two states

$P_{1} V_{1} =P_{2} V_{2}$

Let us look at the two states

State 1 (at top)

Pressure = $1.01*10^5$

Volume = $V_{1}$

State 2 (at bottom)

Pressure = $1.01*10^5 + dgh$

Where

$d$ = Density of liquid (1000 kg/m³)

$d$ = Acceleration due to gravity (9.8 m/s²)

$d$ = Height of liquid (0.200 m)

Pressure = $102,962$

Volume = $V_{2}$

Inputting these values into the Boyles Law

$P_{1} V_{1} =P_{2} V_{2}\\ (101000)V_{1} = (102962)V_{2}\\ \frac{V_{1}}{V_{2}} = \frac{102962}{101000} \\ \frac{V_{1}}{V_{2}} = \frac{1.019}{1}$

6 0

3 years ago

A maroon plane has a takeoff speed of 88.3 m/s and requires 1635 m to reach that speed. Determine the acceleration of the plane

tensa zangetsu [6.8K]

18.5164213 if you divide them both you get that number so the volceity is the number shown above.

6 0

3 years ago

Two charged objects have a repulsive force of 0.050 N. If the charge of both of the objects is doubled, then what is the new for

grandymaker [24]

Answer: 4 times grease

Explanation: Force F= C · q1·q2/r². C = Coulomb's constant.

If charges double you have 2q1 and 2q2.

7 0

3 years ago

Which of the following is an example of the Doppler effect?

Oliga [24]

b is your answers in this thread

3 0

2 years ago