



Test prep for ap courses
A piece of wood can be carved by spinning it on a motorized lathe and holding a sharp chisel to the edge of the wood as it spins. How does the angular velocity of a piece of wood with a radius of 0.2 m spinning on a lathe change when a chisel is held to the wood's edge with a force of 50 N?
 It increases by 0.1 N•m multiplied by the moment of inertia of the wood.
 It decreases by 0.1 N•m divided by the moment of inertia of the woodandlathe system.
 It decreases by 0.1 N•m multiplied by the moment of inertia of the wood.
 It decreases by 0.1 m/s
^{2} .
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A Ferris wheel is loaded with people in the chairs at the following positions: 4 o'clock, 1 o'clock, 9 o'clock, and 6 o'clock. As the wheel begins to turn, what forces are acting on the system? How will each force affect the angular velocity and angular momentum?
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A lever is placed on a fulcrum. A rock is placed on the left end of the lever and a downward (clockwise) force is applied to the right end of the lever. What measurements would be most effective to help you determine the angular momentum of the system? (Assume the lever itself has negligible mass.)
 the angular velocity and mass of the rock
 the angular velocity and mass of the rock, and the radius of the lever
 the velocity of the force, the radius of the lever, and the mass of the rock
 the mass of the rock, the length of the lever on both sides of the fulcrum, and the force applied on the right side of the lever
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You can use the following setup to determine angular acceleration and angular momentum: A lever is placed on a fulcrum. A rock is placed on the left end of the lever and a known downward (clockwise) force is applied to the right end of the lever. What calculations would you perform? How would you account for gravity in your calculations?
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Consider two sizes of disk, both of mass
M . One size of disk has radius
R ; the other has radius 2
R . System A consists of two of the larger disks rigidly connected to each other with a common axis of rotation. System B consists of one of the larger disks and a number of the smaller disks rigidly connected with a common axis of rotation. If the moment of inertia for system A equals the moment of inertia for system B, how many of the smaller disks are in system B?
 1
 2
 3
 4
(d)
You are given a thin rod of length 1.0 m and mass 2.0 kg, a small lead weight of 0.50 kg, and a notsosmall lead weight of 1.0 kg. The rod has three holes, one in each end and one through the middle, which may either hold a pivot point or one of the small lead weights.
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Section summary
 The farther the force is applied from the pivot, the greater is the angular acceleration; angular acceleration is inversely proportional to mass.
 If we exert a force
$F$ on a point mass
$m$ that is at a distance
$r$ from a pivot point and because the force is perpendicular to
$r$ , an acceleration
$\text{a = F/m}$ is obtained in the direction of
$F$ . We can rearrange this equation such that
$\mathrm{F\; =\; ma}\text{,}$
and then look for ways to relate this expression to expressions for rotational quantities. We note that
$\mathrm{a\; =\; r\alpha}$ , and we substitute this expression into
$\mathrm{F=ma}$ , yielding
$\mathrm{F=mr\alpha}$
 Torque is the turning effectiveness of a force. In this case, because
$F$ is perpendicular to
$r$ , torque is simply
$\tau =\mathit{rF}$ . If we multiply both sides of the equation above by
$r$ , we get torque on the lefthand side. That is,
$\text{rF}={\text{mr}}^{2}\alpha $
or
$\tau ={\text{mr}}^{2}\alpha \text{.}$
 The moment of inertia
$I$ of an object is the sum of
${\text{MR}}^{2}$ for all the point masses of which it is composed. That is,
$I=\sum {\text{mr}}^{2}\text{.}$
 The general relationship among torque, moment of inertia, and angular acceleration is
$\tau =\mathrm{I\alpha}$
or
$\begin{array}{}\alpha =\frac{\text{net \tau}}{I}\cdot \\ \end{array}$
Questions & Answers
Why does earth exert only a tiny downward pull?
what is radioactive element
an 8.0 capacitor is connected by to the terminals of 60Hz whoes rms voltage is 150v.
a.find the capacity reactance and rms to the circuit
thanks so much. i undersooth well
is the study of matter in relation to energy
Kintu
a submersible pump is dropped a borehole and hits the level of water at the bottom of the borehole 5 seconds later.determine the level of water in the borehole
power P = Work done per second W/ t. It means the more power, the stronger machine
Sphere
e.g. heart Uses 2 W per beat.
Rohit
A spherica, concave shaving mirror has a radius of curvature of 32 cm .what is the magnification of a persons face. when it is 12cm to the left of the vertex of the mirror
my name is Abu m.konnek
I am a student of a electrical engineer and I want you to help me
Abu
the magnification k = f/(fd) with focus f = R/2 =16 cm; d =12 cm
k = 16/4 =4
Sphere
what do we call velocity
Kings
A weather vane is some sort of directional arrow parallel to the ground that may rotate freely in a horizontal plane. A typical weather vane has a large crosssectional area perpendicular to the direction the arrow is pointing, like a “One Way” street sign. The purpose of the weather vane is to indicate the direction of the wind. As wind blows pa
what about the wind vane
Godfred
If a prism is fully imersed in water then the ray of light will normally dispersed or their is any difference?
the same behavior thru the prism out or in water bud abbot
Ju
If this will experimented with a hollow(vaccum) prism in water then what will be result ?
Anurag
What was the previous far point of a patient who had laser correction that reduced the power of her eye by 7.00 D, producing a normal distant vision power of 50.0 D for her?
What is the far point of a person whose eyes have a relaxed power of 50.5 D?
Jaydie
What is the far point of a person whose eyes have a relaxed power of 50.5 D?
Jaydie
A young woman with normal distant vision has a 10.0% ability to accommodate (that is, increase) the power of her eyes. What is the closest object she can see clearly?
Jaydie
In what ways does physics affect the society both positively or negatively
how can I read physics...am finding it difficult to understand...pls help
try to read several books on phy don't just rely one. some authors explain better than other.
Ju
And don't forget to check out YouTube videos on the subject. Videos offer a different visual way to learn easier.
Ju
Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
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