Columbia University Physics Questions answer these physics questions in the image belowAnswer these physics questions in the image belowAnswer these physic

Columbia University Physics Questions answer these physics questions in the image belowAnswer these physics questions in the image belowAnswer these physics questions in the image below Kudu
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Question 1
(1 points)
A rigid rod of length L rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following must
always be equal at all points on the rod?
1. Angular position
II. Angular velocity
III. Angular acceleration
IV. Tangential acceleration
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O I, II and III
O III and IV
O I, II, III, and IV
O i and 11
0 I and
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Question 2
(1 points)
(#816101)
{Rotational Kinematics)
The figure shows a graph of angular velocity as a function of time for a car driving around a circular track. Through how many radians does the
car travel in the first & minutes?
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5346
(rad minute)
10
VI.
1 minutes)
12
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(rad minute)
10
13%
(minutes)
-10
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Question 3
This question contains multiple parts. Make sure to read all the instructions and answer each part.
(#882009)
{Rotational Kinematics)
13%
Alice and Bob are each riding horses on a carousel. Alice’s horse is twice as far from the axis of spin of the carousel as Bob’s horse.
Part a
(1 points)
Let wА be the angular velocity of Alice’s horse, and let wo be the angular velocity of Bob’s horse. Which of the following is true?
Select the correct answer
اند می هرات 0
OWA – wn
OW W
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Part b
(1 points)
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Part b
(1 points)
Let A denote the speed of Alice’s horse, and let up denote the speed of Bob’s horse. Which of the following is true?
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55°C
Select the correct answer
OUA = Juni
OVA –
OWA = 0
O WA = 40p
OUA – 2u
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Partc
(1 points)
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Part
(1 points)
Let a, A denote the radial acceleration of Alice’s horse and let ar, denote the radial acceleration of Bab’s horse. Which of the following is most
nearly true?
Select the correct answer
OG.,4 – 3ar, 13
13%
+ 190/
O 0,1 = ar,
0,4 – 30-B
O 0,4 = 4ar,
OQA – 20.7
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Question 4
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Question 4
This question contains multiple parts. Make sure to read all the instructions and answer each parl
13
(#602437)
{Rotational Kinematics}
+141/8
The hammer throw event in track and field involves spinning a heavy ball attached to a strong wire in a circle, then releasing it at just a particular
moment in the throw, and at the particular angle, attempting to maximize the horizontal range of its trajectory away from the starting point.
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4
Part a
(1 points)
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Question 12
(1 points)
(#835302) {Rotational Kinetic Energy}
13%
+144604
Consider the motion of the forearm about the elbow during a baseball pitch (a baseball pitch involves several other motions as well, but we will
focus on the rotation of the forearm about the elbow). The linear (tangential) velocity of the ball relative to the elbow joint is 20.8 m/s. Assume
the ball a distance of 0.480 m from the elbow and that the moment of inertia of the forearm+ball combination is 0.429 kg . m, what is the
rotational kinetic energy of the forearrn?
Please enter a numerical answer below. Accepted formats are numbers or “e” based scientific notation e.g. 0.23, -2, 105, 5.231-8
Enter answer here
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Question 13
(1 points)
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Question 13
1 (1 points)
(#611274) Rotational Kinetic Energy}
A4 kg, hollow sphere is rolling on a horizontal surface without slipping. What is the ratio of the sphere’s rotational kinetic energy to its
translational kinetic energy?
13%
+12345
Select the correct answer
04/3
0 2/3
0 1/2
0 1
O 1/3
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Question 14
(1 points)
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Question 14
(1 points)
(#177525)
(Rotational Kinetic Energy)
A hollow sphere (ICON – MR) of mass 2.07 kg and radius 0.138 m rolls without slipping at a speed of 7.57 m/s toward an inclined plane,
which is tilted 8 = 18.2 degrees above horizontal. The ball rolls up the incline plane, again without slipping. How far does the ball go up the plane
(L) before it comes to a momentary stop? Assume there is negligible loss due to any friction in this process.
Image size: SML Max
L
ө
Please enter a numerical answer below. Accepled formals are numbers or ‘e’ based scientific notation e.g. 0.23, 2, 1e6 5.23e8
Enter answer here
meters
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Parta
(1 points)
At the moment that the hammer thrower shown above is spinning at an angular rate of 2.94 revolutions per second, with the ball located 1.35 m
from the center axis of the spin, what is the tangential velocity of ball?
Please enter a numerical answer below. Accepted formats are numbers or “e” based scientific notation e.g. 0.23,-2, 106, 5.231-8
13x
Enter answer here
m/s
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Part b
(1 points)
When a hammer thrower releases her ball, she is aiming to maximize the distance from the starting ring. Assume she releases the ball at an
angle of 50.3 degrees above horizontal, and the ball travels a total horizontal distance of 33.9 m. what angular velocity must she have achieved
(in radians/s) at the moment of the throw, assuming the ball is 1.35 m from the axis of rotation during the spin?
[For this calculation, you may assume that hammer is released from ground level – treating the small actual release height as negligible relative
to the distances involved in this problem]
Please enter a numerical answer below. Accepted formats are numbers or ‘e” based scientific notatione.g. 0.23,-2, 1e6 5.231-8
radians
/second
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Question 5
(1 points)
(#665748)
{Torque)
A 30 cm wrench is used to loosen a bolt with a force applied 0.3 m from the bolt. It takes 60 N to loosen the bolt when the force is applied
perpendicular to the wrench. How much force would it take if the force was applied at a 30 degree angle from perpendicular?
Please enter a numerical answer below. Accepled formals are riurnbers or “e” based scientific notatione.g. 0.23, 2, 106, 5.23e-8
Enter answer here
N
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Question 6
(1 points)
For Workbook Module 9. Exercise 3c, rank the net torques.
Select the correct answer
03>2 > 1
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Question 7
(1 points)
(#468234)
{Moment of Inertia)
The triceps muscle in the back of the upper arm extends the forearm. This muscle in a professional boxer can exert a force of 1.24 x 10°N
with an effective perpendicular lever arm of 3.38 cm, producing an angular acceleration of the forearm of 136 rad/s. What is the moment of
inertia of the boxer’s forearm?
13
13%
[Note: the perpendicular lever arm is defined as r_ – rsin(@); it incorporates both the distance from the joint to the insertion point of the
muscle group (by way of tendons) to the bone as well as the angle of the insertion]
Please enter a numerical answer below. Accepled formals are numbers or ‘e’ based scientific notatione.g. 0.23, 2, 1e6 5.23e 8
Enter answer here
kg – m?
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Question 8
(1 points)
(#867266)
{Moment of Inertla)
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Question 8
(1 points)
(#867266)
{Moment of Inertia)
A weight of mass 1.97 kg is suspended by a string wrapped around a pulley wheel, which consists of a solid disk of mass 5.23 kg and radius
1.03 m. The system is released from rest. Over what vertical distance does the hanging mass move in 3.0 seconds? Ignore friction and drag
forces, and assume that the string does not slip.
Image size: SML Max
13%
м”.
18
m
Please enter a numerical answer below. Accepted formats are numbers or “e” based scientific notation e.g. 0.23,-2, 106, 5.231-8
Enter answer here
_m
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points)
(#078493)
Moment of Inertia)
In fast-pitch softball, a pitcher swings her arm from straight overhead in a circle, releasing the 0.190 kg ball at the bottom of the swing. If a
pitcher’s arm has a length of 0.911 m and mass of 3.17 kg, and the ball goes from initially at rest to a tangential speed of 25.9 m/s before
release, what average torque must the pitcher apply to the ball? Model the pitcher’s arm as a uniform thin rod swung about one end, and make
sure you don’t forget the mass of the softball (but you can ignore its shape; i.e., treat it like a point mass). Hint: you will need to make use of the
equations of circular motion for constant angular acceleration that we derived back in week 2.
13%
+ 127KUS
Extra Credit as it involves some more advanced concepts on moment of inertia that we had no
time to cover.
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Question 11
(1 points)
(#761691)
{Rotational Kinetic Energy}
The net work done in accelerating a suspended wheel (hanging by its axle from a string) from rest to an angular speed of 50 rev/ min is
W – 5900 J. What is the moment of inertia of the wheel?
13
Select the correct answer
O 430.4 kg.mp
4916 kg.m
O 2.362 kg – m
O 118.1 kg.m?
O 1054 kg.mº
No answer submitted
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Question 12
(1 points)
(#835302)
{Rotational Kinetic Energy}
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