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
Amiraneli [1.4K]
3 years ago
14

A string under a tension of 50.4 N is used to whirl a rock in a horizontal circle of radius 2.51 m at a speed of 21.1 m/s. The s

tring is pulled in and the speed of the rock increases. When the string is 1.22 m long and the speed of the rock is 51.6 m/s, the string breaks. What is the breaking strength (in newtons) of the string?
Physics
1 answer:
Leokris [45]3 years ago
5 0

Answer:

619.8 N

Explanation:

The tension in the string provides the centripetal force that keeps the rock in circular motion, so we can write:

T=m\frac{v^2}{r}

where

T is the tension

m is the mass of the rock

v is the speed

r is the radius of the circular path

At the beginning,

T = 50.4 N

v = 21.1 m/s

r = 2.51 m

So we can use the equation to find the mass of the rock:

m=\frac{Tr}{v^2}=\frac{(50.4)(2.51)}{21.1^2}=0.284 kg

Later, the radius of the string is decreased to

r' = 1.22 m

While the speed is increased to

v' = 51.6 m/s

Substituting these new data into the equation, we find the tension at which the string breaks:

T'=m\frac{v'^2}{r'}=(0.284)\frac{(51.6)^2}{1.22}=619.8 N

You might be interested in
some animals communicate by emitting low frequency sound waves.When the animal emits a low frequency sound wave what is the resu
valentina_108 [34]

Pitch is way to relate a sound to its frequency. High frequencies have high pitches (think of a flute), and low frequencies have low pitches (think of a bass).
<span>
</span>
7 0
3 years ago
A bowler throws a bowling ball of radius R = 11 cm down the lane with initial speed v₀ = 7.5 m/s. The ball is thrown in such a w
salantis [7]

Answer:

a) t = 0.74s

b) D = 4.76m

c) Vf = 5.35m/s

Explanation:

The ball starts rolling when Vf = ωf*R.

We know that:

Vf = Vo - a*t

ωf = ωo + α*t

With a sum of forces on the ball:

Ff = m*a

\mu*N = m*a

\mu*m*g = m*a

a=\mu*g=2.9m/s^2

With a sum of torque on the ball:

Ff*R = I*\alpha

\mu*m*g*R = 2/5*m*R^2*\alpha

\alpha=5/2*\mu*g/R=65.9rad/s^2

Replacing both accelerations:

Vo - a*t=\alpha*t*R

7.5 - 2.9*t=65.9*t*0.11

t=0.74s

The distance will be:

D = Vo*t-1/2*a*t^2

D = 4.76m

Final velocity:

Vf=Vo-a*t

Vf=5.35m/s

7 0
3 years ago
Which of the following is an example of bad sportsmanship?
Minchanka [31]

I believe that B is the answer.

3 0
3 years ago
Bruh how did i get 3 warnings and 3 brainliests removed
Brums [2.3K]

Answer:

Wait, that can happen? I'm sorry.

Explanation:

5 0
3 years ago
Read 2 more answers
Name five characteristics of a star that can be determined by measuring its spectrum. Explain how you would use a spectrum to de
Ne4ueva [31]

Answer:

Chemical composition, Temperature, Radial velocity, Size or diameter of the star, Rotation.

Explanation:  

Elemental abundances are determined by analyzing the relative strengths of the absorption lines in the spectrum of a star.

The Spectral class to which the star belongs gives the information related to the temperature of the star. It is the spectral lines that determine the spectral class O B A F G K M are the spectral classes.

By measuring the wavelengths of the lines in the star's spectrum gives the radial velocity. Doppler shift is the method used to find the radial velocity.

A star can be classified as a giant or a dwarf . A giant star will have narrow width spectral lines whereas a dwarf star has wider spectral lines.

Broadening of the spectral lines will determine the star's rotation.

6 0
3 years ago
Other questions:
  • Calculate the translational speed of a cylinder when it reaches the foot of an incline 7.35 m high. assume it starts from rest a
    10·1 answer
  • If your vehicle sinks in water, which window should you kick out when the pressure equalizes?
    9·1 answer
  • What is the power when a crane lifts a piece of pipe from the ground to a certain height, doing 15000 J of work in 25s?
    13·1 answer
  • What is the main factor that prevents the growth of tropical plants in the northern part of the United States?
    11·1 answer
  • A woman is sitting at a bus stop when an ambulance with a siren wailing at 317 Hz approaches at 69 miles per hour (mph). Assume
    5·1 answer
  • The speed of sound in liquids, gases, and solids is as follows, from fastest to slowest a Gas, liquid, solid b- Liquid, solid, g
    9·1 answer
  • If stretching is done during the cool-down, it can help the muscle _____.
    9·1 answer
  • Calculate the mass of a planet that exerts a 1.5 X 10 13 N force on a 5.4 x 10
    14·2 answers
  • Two resistors R1 = 3 Ω and R2 = 6 Ω are connected in parallel. What is the net resistance in the circuit?​
    13·1 answer
  • A wave travels one complete cycle in20sec and has wavelength of 1000mm.what is the speed​
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!