



Test prep for ap courses
Which of the following represents the distance (how much ground the particle covers) moved by a particle in a simple harmonic motion in one time period? (Here,
A represents the amplitude of the oscillation.)
 0 cm

A cm
 2
A cm
 4
A cm
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In the formula
$F\text{\hspace{0.17em}}=\text{\hspace{0.17em}}kx$ , what does the minus sign indicate?
 It indicates that the restoring force is in the direction of the displacement.
 It indicates that the restoring force is in the direction opposite the displacement.
 It indicates that mechanical energy in the system decreases when a system undergoes oscillation.
 None of the above
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The splashing of a liquid resembles an oscillation. The restoring force in this scenario will be due to which of the following?
 Potential energy
 Kinetic energy
 Gravity
 Mechanical energy
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Section summary
 An oscillation is a back and forth motion of an object between two points of deformation.
 An oscillation may create a wave, which is a disturbance that propagates from where it was created.
 The simplest type of oscillations and waves are related to systems that can be described by Hooke’s law:
$F=\text{kx},$
where
$F$ is the restoring force,
$x$ is the displacement from equilibrium or deformation, and
$k$ is the force constant of the system.
 Elastic potential energy
${\text{PE}}_{\text{el}}$ stored in the deformation of a system that can be described by Hooke’s law is given by
${\text{PE}}_{\text{el}}=(1/2){\mathit{\text{kx}}}^{2}.$
Conceptual questions
Problems&Exercises
Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to truthfully report the mass).
(a) What is the force constant of the spring in such a scale if it the spring stretches 8.00 cm for a 10.0 kg load?
(b) What is the mass of a fish that stretches the spring 5.50 cm?
(c) How far apart are the halfkilogram marks on the scale?
(a)
$1\text{.}\text{23}\times {\text{10}}^{3}\phantom{\rule{0.25em}{0ex}}\text{N/m}$
(b)
$6\text{.}\text{88 kg}$
(c)
$4\text{.00 mm}$
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It is weighin time for the local under85kg rugby team. The bathroom scale used to assess eligibility can be described by Hooke’s law and is depressed 0.75 cm by its maximum load of 120 kg. (a) What is the spring’s effective spring constant? (b) A player stands on the scales and depresses it by 0.48 cm. Is he eligible to play on this under85 kg team?
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One type of BB gun uses a springdriven plunger to blow the BB from its barrel. (a) Calculate the force constant of its plunger’s spring if you must compress it 0.150 m to drive the 0.0500kg plunger to a top speed of 20.0 m/s. (b) What force must be exerted to compress the spring?
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(a) The springs of a pickup truck act like a single spring with a force constant of
$1\text{.}\text{30}\times {\text{10}}^{5}\phantom{\rule{0.25em}{0ex}}\text{N/m}$ . By how much will the truck be depressed by its maximum load of 1000 kg?
(b) If the pickup truck has four identical springs, what is the force constant of each?
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When an 80.0kg man stands on a pogo stick, the spring is compressed 0.120 m.
(a) What is the force constant of the spring? (b) Will the spring be compressed more when he hops down the road?
(a)
$6\text{.}\text{53}\times {\text{10}}^{3}\phantom{\rule{0.25em}{0ex}}\text{N/m}$
(b) Yes
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A spring has a length of 0.200 m when a 0.300kg mass hangs from it, and a length of 0.750 m when a 1.95kg mass hangs from it. (a) What is the force constant of the spring? (b) What is the unloaded length of the spring?
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Questions & Answers
Suppose a speck of dust in an electrostatic precipitator has 1.0000×1012 protons in it and has a net charge of –5.00 nC (a very large charge for a small speck). How many electrons does it have?
how would I work this problem
Alexia
how can you have not an integer number of protons? If, on the other hand it supposed to be 1e12, then 1.6e19C/proton • 1e12 protons=1.6e7 C is the charge of the protons in the speck, so the difference between this and 5e9C is made up by electrons
Igor
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
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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