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
jarptica [38.1K]
3 years ago
9

A uniform disk with mass m = 8.54 kg and radius R = 1.35 m lies in the x-y plane and centered at the origin. Three forces act in

the +y-direction on the disk: 1) a force 334 N at the edge of the disk on the +x-axis, 2) a force 334 N at the edge of the disk on the –y-axis, and 3) a force 334 N acts at the edge of the disk at an angle θ = 30° above the –x-axis.
a. What is the magnitude of the torque on the disk about the z axis due to F1?
b. What is the magnitude of the torque on the disk about the z axis due to F2?
c. What is the magnitude of the torque on the disk about the z axis due to F3?
d. What is the x-component of the net torque about the z axis on the disk?
e. What is the y-component of the net torque about the z axis on the disk?
f. What is the z-component of the net torque about the z axis on the disk?
g. What is the magnitude of the angular acceleration about the z axis of the disk?
h. If the disk starts from rest, what is the rotational energy of the disk after the forces have been applied for t = 1.6 s?
Physics
1 answer:
Brrunno [24]3 years ago
3 0

Answer:

A) τ_1 = 450.9 N.m

B) τ_2 = 0 N.m

C) τ_3 = 390.47 N.m

D) There is no x-component.

E) There is no y-component.

F) τ_z = 60.43 N.m

G) α = 7.765 rad/s²

H) K = 600.6J

Explanation:

A) τ_1 = F1•r1•sinθ1

τ_1 = 334 x 1.35 x sin90

τ_1 = 450.9 N.m

B) τ_2 = F2•r2•sinθ2

τ_2 = 334 x 1.35 x sin180

τ_2 = 0 N.m

C) τ_3 = F3•r3•sinθ3

τ_3 = 334 x 1.35 x sin60

τ_3 = 390.47 N.m

D) Torque from F2 is zero and both torques from F1 and F3 are in z direction, thus, there is no x-component.

E) Torque from F2 is zero and both torques from F1 and F3 are in z direction, thus, there is no y-component.

F) τ_1 is in the positive z direction

τ_2 is zero

τ_3 is in the negative z direction

Hence, τ_z = 450.9 - 390.47 = 60.43 N.m

G) moment of inertia is given as ;

I = (1/2)MR²

Thus ;

I = (1/2) x 8.54 x 1.35² = 7.782 N.m

Angular acceleration is;

α = τ_z/I

α = 60.43/7.782 = 7.765 rad/s²

H) angular velocity is;

ω = αt = 7.765 x 1.6 = 12.424 rad/s

Rotational energy, K = (1/2)Iω²

K = (1/2) x 7.782 x (12.424)² = 600.6J

You might be interested in
Select the correct answer. Which event is an example of distress (or negative stress)? A. Moving to a new city B. Getting a new
brilliants [131]

Answer:

I think it's<u> D. Getting divorced</u>

Explanation:

3 0
3 years ago
After a 50-kg person steps from a boat onto the shore, the boat moves away with a speed of 0.70 m/s with respect to the shore. I
Svetradugi [14.3K]

Answer:

M=125 kg

v=1.75 m/s

Explanation:

From the law of linear momentum

  P =mv

Case 1     50*V =M* 0.7     equation 1

               50*V =(M+50)* 0.5    equation 2

equating 1 and 2

               M* 0.7=(m+50)* 0.5

               0.2 M= 25

                    M=125 kg

Putting value of M in equation 1

               50*V =125*0.7

                     V=1.75 m/s

                   

7 0
3 years ago
Read 2 more answers
crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied​
Klio2033 [76]

Answer:

 F = 5226.6 N

Explanation:

To solve a lever, the rotational equilibrium relation must be used.

We place the reference system on the fulcrum (pivot point) and assume that the positive direction is counterclockwise

         F d₁ = W d₂

where F is the applied force, W is the weight to be lifted, d₁ and d₂ are the distances from the fulcrum.

In this case the length of the lever is L = 5m, t the distance desired by the fulcrum from the weight to be lifted is

d₂ = 200 cm = 2 m

therefore the distance to the applied force is

          d₁ = L -d₂

         d₁ = 5 -2

         d₁= 3m

we clear from the equation

          F = W d₂ / d₁

          W = m g

          F = m g d₂ / d₁

we calculate

      F = 800 9.8 2/3

      F = 5226.6 N

4 0
2 years ago
Charge q is accelerated starting from rest up to speed v through the potential difference V. What speed will charge q have after
adoni [48]

Answer: v = 1.19 * 10^{6} m/s

Explanation: q = magnitude of electronic charge = 1.609 * 10^{-19} c

mass of an electronic charge = 9.10 * 10^{-31} kg

V= potential difference = 4V

v = velocity of electron

by using the work- energy theorem which states that the kinetic energy of the the electron must equal the work done use in accelerating the electron.

kinetic energy = \frac{mv^{2} }{2},  potential energy = qV

hence, \frac{mv^{2} }{2} = qV

\frac{9.10 *10^{-31} * v^{2}  }{2} = 1.609 * 10^{-16} * 4\\\\\\\\9.10*10^{-31}  * v^{2} = 2 * 1.609 *10^{-16} * 4\\\\\\9.10 *10^{-31} * v^{2} = 1.287 *10^{-15} \\\\v^{2} = \frac{1.287 *10^{-15} }{9.10 *10^{31} } \\\\v^{2} = 1.414*10^{15} \\\\v = \sqrt{1.414*10^{15} } \\\\v = 1.19 * 10^{6} m/s

7 0
2 years ago
you decide to work part time at a local supermarket. The job pays eight dollars and 60 per hour and you work 20 hours per week.
aleksley [76]

Answer:

I guess that we want to find how much money you get each week.

We know that the job pays $8.60 per hour.

We know that you work 20 hours per week.

Then the gross pay (the total money that you earn) in a week is 20 times $8.60, or:

20*$8.60 = $172.

Now we know that your employer witholds:

10% + 7.65% + 5% = 22.65%

Then your employer withholds 22.65% of your gross pay.

if the 100% of your gross pay is $172

Then the 22.65% will be:

(22.65%/100%)*$172 = 0.2265*$172 = $38.96

This means that your employer withholds $38.96 of your weekly gross pay.

Then each week you get:

$172 - $38.96 = $133.04

4 0
2 years ago
Other questions:
  • A pipe of length 6.8 m is closed at one end and sustains a standing wave at its second overtone. determine the distance between
    13·1 answer
  • How far will a cheetah travel if it runs at 30 m/s for 60s?
    14·1 answer
  • Why do you want the lights in a circuit in parallel instead of series
    8·2 answers
  • Mary just received a traffic ticket but decided it is not worth being upset about. Mary just made a__________.
    15·1 answer
  • Which method is used to assign weights to various features of a system?
    7·1 answer
  • Can someone list two non-examples of volcano formations/eruptions?
    8·1 answer
  • The idealized body that emits the maximum amount of radiation at a given temperature and absorbs all the radiation incident on i
    7·1 answer
  • In which item is energy stored in the form of gravitational potential energy?
    13·2 answers
  • What is Triangle ill send a picture​
    13·2 answers
  • 2)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!