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
ryzh [129]
3 years ago
15

A boy is playing with a ball of mass 72g attached to a string. He is moving it at constant speed in a horizontal circle of radiu

s 0.9m. a. State the net work done on the ball in one complete revolution. (1) b. The tension in the string is 60N. Determine the angular velocity of the ball. (4) c. Calculate the time it takes for the ball to complete 20 revolutions. (2)
Physics
1 answer:
irina [24]3 years ago
3 0

Answer:

Explanation:

radius of circle r = 0.9 m.

(a ) In a motion on circular path , work done is zero because force ( centripetal force ) acts perpendicular to displacement .

( b )

Tension in string T = m ω²r

Putting the values

60 = .072 x ω² x 0.9

ω² = 926

ω = 30.4 rad /s

angle made in 20 revolutions θ = 20 x 2π = 126.6 rad

time taken = θ / ω

= 126.6 / 30.4

= 4.16 s .

You might be interested in
Which two Bible verses state that Jesus Christ holds together everything in the universe by His power?
lidiya [134]

Answer:

Colossians 1:17

Explanation:

He is before all things, and in him all things hold together.

7 0
3 years ago
Read 2 more answers
True or False. Only the initial ball carrier<br><br> can recover a fumble.
Mrrafil [7]

Answer:

A fumbled ball may be recovered and advanced by either team

hope it helps

4 0
2 years ago
Read 2 more answers
The figure below shows a dipole. If the positive particle has a charge of 37.3 mC and the particles are 3.08 mm apart, what is t
kolbaska11 [484]

The electric field at point A located 2.00 mm above the dipole's midpoint is 5.287 X 10¹³ N/C.

<h3>Electric field of the positive particle</h3>

The electric field is calculated as follows;

E = kq/r²

where;

  • r is the distance between the charges
  • k is Coulomb's constant
  • q is magnitude of the charge

midpoint of 3.08 m, x = 1.54 mm

r(1.54 mm, 2.00 mm)

|r| = √(1.54² + 2²)

|r| = 2.52 mm

E = (9 x 10⁹ x 37.3 x 10⁻³)/(2.52 x 10⁻³)²

E = 5.287 X 10¹³ N/C

Thus, the electric field at point A located 2.00 mm above the dipole's midpoint is 5.287 X 10¹³ N/C.

Learn more about electric field here: brainly.com/question/14372859

#SPJ1

5 0
1 year ago
How do scientists classify small objects in the solar system?
LiRa [457]
*size
*shape
*temperature
*compostion
4 0
3 years ago
Water flows over a section of Niagara Falls at rate of 1.1×10^6 kg/s and falls 49.4 m. How much power is generated by the fallin
DerKrebs [107]

Answer:

<em>The power generated is =  5.33×10⁸ Watt. </em>

Explanation:

Power: Power can be defined as the time rate of doing work. The S.I unit of power is <em>Watt(W).</em>

<em>Mathematically,</em>

<em>Power (P) = Work done/time or Energy/time</em>

P = mgh/t............................... Equation 1

P = δgh............................. Equation 2

Where δ = fall rate, g = acceleration due to gravity, h = height.

<em>Given: </em>δ = 1.1×10⁶ kg/s, h = 49.4 m g = 9.81 m/s²

Substituting these values into equation 2

P = 1.1×10⁶×49.4×9.81

P = 533.08×10⁶

<em>P = 5.33×10⁸ Watt.</em>

<em>Thus the power generated is =  5.33×10⁸ Watt. </em>

5 0
3 years ago
Other questions:
  • Which of the following occurs when a wire is looped into a coil?
    9·1 answer
  • A boy throws a steel ball straight up. consider the motion of the ball only after it has left the boy's hand but before it touch
    11·2 answers
  • A measure of your memory in which you need to pick the correctly learned answer from a displayed list of options is known as a m
    9·2 answers
  • Which of these is a good conductor?<br> A. silver<br> B. rubber<br> C. paper<br> D. cotton
    13·1 answer
  • An electron is located on a pinpoint having a diameter of 3.52 µm. What is the minimum uncertainty in the speed of the electron?
    15·1 answer
  • When we talk about how a Ferrari obtains a top speed of 349 km/h, are we referring to average speed or instantaneous? How do you
    7·2 answers
  • A car accelerates on a horizontal road due to the force exerted by :
    9·1 answer
  • Describe the path of the electric current through a circuit?​
    10·1 answer
  • 2. If rain is falling vertically downward, and you are running for shelter, should you hold your umbrella
    10·1 answer
  • Which statement does not describe a characteristic of a good outline?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!