1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Bezzdna [24]
3 years ago
13

In 8.4 s a fisherman winds 2.9 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation)

. The line is being reeled in at a constant speed. Determine the angular speed of the reel.
Physics
1 answer:
alukav5142 [94]3 years ago
3 0

Answer:

The angular speed of the reel is 11.33 rad/s

Explanation:

Given

The fisherman takes t = 8.4 s to wind distance x = 2.9 m into a circle radius of r = 3 cm = 0.03 m

Than the tangencial speed equals the change in the distance to the time

v = \frac{x}{t} = \frac{2.9 m}{8.4 s} = 0.34 \frac{m}{s}

Knowing the tangencial velocity is proportional to the radius r and the angular velocity

v = r*w

w = \frac{0.34 m/s}{0.03 m} = 11.33 \frac{rad}{s}

You might be interested in
Please help & actually answer thank you :)
Katarina [22]

Answer:

0.5x35=17.5

Explanation:

You throw 0.5 kg the ball leaves your hand with

A speed of 35

4 0
2 years ago
Read through the scenarios below and calculate the predicted change in kinetic energy of the object compared to a 100 kg ball tr
sashaice [31]

Okay, first off, the formula for Kinetic Energy is:

<em>KE = 1/2(m)(v)^2</em>

<em>m = mass</em>

<em>v = velcoity (m/s)</em>


Using this formula, we can then calculate the kinetic energy in each scenario:

1) KE = 1/2(100)(5)^2 = 1,250 J

2) KE = 1/2(1000)(5)^2 = 12,500 J

3) KE = 1/2(10)(5)^2 = 125 J

4) KE = 1/2(100)(5)^2 = 1,250 J

4 0
3 years ago
Read 2 more answers
9. a) What is the Doppler effect? b) How does it work? c) If 12 points
mart [117]

a) Doppler effect is an apparent change in the frequency of a wave due to the relative motion between the source and the observer

b) It is given by the equation f'=\frac{v\pm v_o}{v\pm v_s}f

c) The star is moving towards us

Explanation:

a)

The Doppler effect is a phenomenon that occurs whenever there is a source of a wave in relative motion to an observer. When such situation occurs, the apparent frequency of the sound as perceived by the observe is different from the proper frequency of the wave emitted by the source.

A typical example of this situation is when an ambulance is approaching you. The sound of the siren is perceived as having a higher pitch (higher frequency) as the ambulance moves towards you, and then is perceived as having a lower pitch (lower frequency) when the ambulance moves away from you.

The same phenomenon occurs not only with sound waves, but also with light waves and other types of waves.

b)

Mathematically, the Doppler effect can be summarized by the following equation:

f'=\frac{v\pm v_o}{v\pm v_s}f

where:

f is the proper frequency of the wave emitted by the source

f' is the apparent frequency, as perceived by the observer

v is the speed of the wave

v_o is the velocity of the observer, which is positive if the observer is moving towards the source and negative if the observer is moving away from the source

v_s is the velocity of the source, which is positive if the source is moving away from the observer and negative if the source is moving towards the observer

Applied to the example of the ambulance, we have that:

v_o = 0, assuming that the observer is at rest

- when the ambulance is moving towards the observer, v_s is negative, and therefore the fraction is larger than 1, therefore f'>f and the apparent frequency is higher than the real frequency

- when the ambulance is moving away from the observer, v_s is positive, and therefore the fraction is  smaller than 1, therefore f' and the apparent frequency is lower than the real frequency

c)

As we mentioned earlier, the Doppler effect also occurs with light waves. This is particularly relevant for stars or galaxies moving towards or away from us, since the light coming from these objects will have a frequency (and also a wavelength) "shifted" due to the Doppler effect.

In particular, we have two possible  cases:

- For a star moving away from us, the frequency of the light emitted by the star will appear lower than the real frequency --> this means that its wavelength will appear longer than the real wavelength (because wavelength is inversely proportional to the frequency), and this means that the light will appear shifted towards longer wavelengths (so, towards the red end of the visible spectrum)

- For a star moving away towards us, the frequency of the light emitted by the star will appear higher than the real frequency --> this means that its wavelength will appear shorter than the real wavelength, and this means that the light will appear shifted towards shorter wavelengths (so, towards the blue end of the visible spectrum)

Therefore, if a star looks bluer to us than it should, the star is moving towards us.

Learn more about waves:

brainly.com/question/5354733

brainly.com/question/9077368

#LearnwithBrainly

8 0
3 years ago
Other scientists left blanks in their tables. What did Mendeleev do that others did not
Sonbull [250]

Hope this helps:

(if so please mark brainlest!!)


"Mendeleev arranged the elements in the order of increasing atomic mass, the properties where repeated. And he corrected the known atomic masses of some elements and <u>used the patterns in his table</u> to predict the properties of the elements he thought must exist but had not been discovered yet"

6 0
3 years ago
When the temperature of an object increases, what happens to the kinetic energy of the particles in the object?
d1i1m1o1n [39]
When the average kinetic energy of the particles in the object increases, we sense and measure that change as an increase in the object's temperature.
3 0
3 years ago
Other questions:
  • When exposed to a radioactive source which emits 1.2-MeV gamma-rays, a particular material is found to have a half-value thickne
    8·1 answer
  • What do you mean by the statement relative density of gold is 19.3
    8·1 answer
  • We divide the electromagnetic spectrum into six major categories of light, listed below. Rank these forms of light from left to
    8·1 answer
  • To study the dependant variable, a scientist must A. manipulate the independent variable B. have more than one control group C.
    11·1 answer
  • What statement about the greenhouse effect is not true?
    15·1 answer
  • Resisting force is
    10·1 answer
  • A cell has an emf of 1.5 V and an internal resistance of 0.65 Q.
    8·1 answer
  • I really need some with help with this anyone who can help with acceleration and velocity pleasee and thank you
    8·1 answer
  • When a low-pressure gas of hydrogen atoms is placed in a tube and a large voltage is applied to the end of the tube, the atoms w
    14·1 answer
  • The plasma membrane of a neuron has voltage-gated sodium and potassium channels. What is the effect of membrane depolarization o
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!