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
Vikentia [17]
3 years ago
11

A boy is whirling a stone around his head by means of a string. The string makes one complete revolution every second, and the t

ension in the string is directed horizontally. The boy then speeds up the stone, keeping the radius of the circle constant, so that the string makes two complete revolutions every second. What happens to the tension in the sting?The tension reduces to one-fourth of its original value.The tension is unchanged.The tension reduces to half of its original value.The tension increases to four times its original value.The tension increases to twice its original value.
Physics
1 answer:
slega [8]3 years ago
5 0

Answer:

The tension increases to four times its original value.

Explanation:

v = Velocity

r = Radius

m = Mass of stone

The centripetal force is

F_c=m\dfrac{v^2}{r}

The tension will balance the centripetal force

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

\\\Rightarrow T\propto v^2

\dfrac{T_1}{T_2}=\dfrac{v_1^2}{v_2^2}\\\Rightarrow \dfrac{T_1}{T_2}=\dfrac{v_1}{2^2v_1^2}\\\Rightarrow \dfrac{T_1}{T_2}=\dfrac{1}{4}\\\Rightarrow T_2=4T_1

The new tension will be 4 times the old tension

You might be interested in
Two forces act on the screw eye. If F = 600 N, determine the magnitude of the resultant force and the angle θ if the resultant f
asambeis [7]

Answer:

What does ur question mean can u explain me

7 0
2 years ago
Why is there convection in the outer core and what is the result of this?
mars1129 [50]

Answer:

re believed to influence the Earth's magnetic field. ... As heat is transferred outward toward the mantle, the net trend is for the inner boundary of the liquid region to freeze, causing the solid inner core to grow

Explanation:

6 0
3 years ago
A child on a sled has a combined mass of 54 kg. At the top of a 2.7 meter hill, the sled has a
leonid [27]

Answer:

8.78?m/s

Explanation:

There are many students who can not get answers step by step and on time

So there are a wats up group where you can get help step by step and well explained answer from trusted experts.

so hurry up

5 0
2 years ago
Two magnets are sliding towards each other. One of the magnets, which has a mass of 125 grams, is moving in the positive x-direc
olasank [31]

Answer:

0.45 m/s in the negative x-direction

Explanation:

From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum

Momentum, p=mv where m is the mass and v is the velocity

m_1v_1+m_2v_2=(m_1+m_2)v_c where v_c is the common velocity, v_1 and v_2 are velocities of magnet moving in positive x-direction and magnet moving in negative x-direction respectively, m_1 and m_2 are masses of magnet moving in positive x-direction and magnet moving in negative x-direction respectively.

Substituting 125 g for m_1 and 85 g for m_2, 7.33 m/s v_1, -11.9 m/s for v_1 then

125 g\times 7.33 m/s + (85 g\times -11.9)=(125 g+ 85 g)\times v_c

-95.25 g. m/s=210 g v_c

v_c=\frac {-95.25 g.m/s}{210 g}=-0.453571429 m/s
\approx -0.45 m/s

Therefore, the velocity of single unit is 0.45 m/s in the negative x-direction

5 0
3 years ago
Design your own roller coaster
Sophie [7]

Answer:

roller coaster is very nice to see

5 0
2 years ago
Other questions:
  • Using the rules for the significant figures what do you get when you add 24.545 and 307.3
    5·1 answer
  • A swimmer can swim in still water at a speed of 9.50 m/s. he intends to swim directly across a river that has a downstream curre
    14·1 answer
  • At what age is a child likely to learn to sit up without support?
    10·1 answer
  • A box weighing 52.4 N is sliding on a rough horizontal floor with a constant friction force of magnitude LaTeX: ff. The box's in
    14·1 answer
  • I need to know everything about mars. I need to do a full 3 page essay. please help!
    9·1 answer
  • PLSS HELP!! Are these True or False questions
    9·1 answer
  • In any given wave, when the frequency of the wave doubles (f = 2f), which of the following other changes would also take place?
    8·1 answer
  • A gun is fired on a day when the speed of sound is 335 m/s and an echo is heard 0.75 seconds later. How far away is the object t
    9·1 answer
  • A gun can fire a bullet at 540 m/s. If the gun is aimed at an angle of 55o above the horizontal and fired, what will be the hori
    12·1 answer
  • How would the period of a planet depend on its orbital distance from a star? in this comparison,
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!