Answer:
Option A
Explanation:
since the woman pushed on the door, the door pushes back on the girl's hand since every action has an equal and opposite reaction.
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A disk whose rotational inertia is 450 kg.m2 hangs from a wire whose torsion constant is 2300 N.m/rad. When its angular displacement is -0.23 rad, what is its angular acceleration
For a disk whose rotational inertia is 450 kg.m2 hangs from a wire whose torsion constant is 2300 N.m/rad, the angular acceleration is mathematically given as
a = 1.176 rad/s^2
What is its angular acceleration?
Generally, the equation for the angular acceleration is mathematically given as
a = torsion constant x theta/inertia
therefore,
a = 2300 x 0.23/450
a = 1.176 rad/s^2
In conclusion, the angular acceleration is
a = 1.176 rad/s^2
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Please help me i need know
Answer:
a) the result capacitor
ct=c1+c2+c3+c4
ct=2×10^-6+4×10^-6+6×10^-6+8×10^-6
ct=20×10^-14
b)q=ct×v
q=20×10^-14×50
q=1000×10^-14 c
Explanation:
c)v1=q/ct
v1=1000×10^-14/20×10^-14
v1=50 volt
v2=
A hand exerciser utilizes a coiled spring. A force of 108.0 N is required to compress the string by 0.0191 m. Determine the force needed to compress the spring by 0.0440 m. N
By Hooke's law, the spring exerts a restoring force with magnitude F when compressed by a distance x according to
F = kx
where k is the spring constant. Solve for k :
k = F / x = (108.0 N) / (0.0191 m) = 5654.45 N/m
Now solve for F when x = 0.0440 m :
F = (5654.45 N/m) (0.0440 m) = 248.796 N ≈ 249 N
A person driving in a neighborhood traveling 9 m/s slows to a stop (0 m/s) over 4 seconds as they approach a stop sign. What is the rate of acceleration of the car coming to a stop in m/s2?
Answer:
-2.25
Explanation:
v=u+at
0=9+a(4)
9+4a=0
4a=-9
a= -2.25
the rate of acceleration of the car coming to a stop is 2.25 m/s².
What is Speed?speed is described as. the pace at which an object's location changes in any direction. Speed is defined as the distance traveled divided by the travel time. Speed is a scalar quantity because it just has a direction and no magnitude.
given, A person driving in a neighborhood traveling 9 m/s slows to a stop (0 m/s) over 4 seconds as they approach a stop sign.
The acceleration of the car can be calculated using the formula:
acceleration = (final velocity - initial velocity) / time
Here, the initial velocity is 9 m/s (the speed at which the car was traveling before braking),
the final velocity is 0 m/s (the speed at which the car comes to a stop), and the time taken to stop is 4 seconds. Substituting these values into the formula,
we get:
acceleration = (0 m/s - 9 m/s) / 4 s
acceleration = -9 m/s / 4 s
acceleration = -2.25 m/s²
The negative sign indicates that the car is decelerating, or slowing down.
Therefore, the rate of acceleration of the car coming to a stop is 2.25 m/s².
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A uniform solid sphere of unknown radius and mass floats exactly half-submerged in a fluid of density 999 kg/m3. Find the density of the material of which the sphere is made (in kg/m3).
Answer:
Explanation:
ρ =
making mass subject of formula we have
m=ρv
from the question aluminium and zinc have same mass hence we can say;
Find the time required to move from the equilibrium position directly to a point a distance 12.3 cm away.A cheerleader waves her pom-pom in SHM with an amplitude of 18.0 cm and a frequency of 0.855 Hz
The time required to move from the equilibrium position directly to a point a will be 0.879 sec.
What is the period of oscillation?The period is the amount of time it takes for a particle to perform one full oscillation. T is the symbol for it. Taking the reciprocal of the frequency yields the frequency of the oscillation.
The standard equation for the SHM is found as;
[tex]\rm x = asin \omega t \\\\ \rm 12.3 \times 10^{-2} = 18.0 \times 10^{-2}sin \omega t \\\\ 0.6833=sin \omega t \\\\ \omega t =sin^{-1}0.6833 \\\\ \omega t =0.7522 \\\\ t = \frac{0.7522}{0.855 } \\\\ t=0.879\ sec[/tex]
Hence the time required to move from the equilibrium position directly to a point a will be 0.879 sec.
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A main difference between asteroids and comets is that asteroids are mostly made of rock and comets are mostly made of.
Explanation:
Comets are mostly made of ice and dust
Answer:
The main difference between asteroids and comets is their composition, as in, what they are made of. Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.Explanation:
Choose the true statements about electric fields and forces. (Choose 3)
Electric fields can be positive or negative.
Electric fields have a south pole and a north pole.
Electric fields can attract or repel objects.
Electric forces are strongest near the charged object.
Electric forces are strongest farther from the charged object.
Electric fields only repel objects.
Answer:
The three best answers are:
Electric fields can be positive or negative (depending on source)
Electric fields can attrace or repel objets (assuming the object is charged)
Electric forces are strongest near the charged object E ∝ 1 / R^2
How can you increase the torque you are putting on a lever, without exerting any more force?
Answer:
See below
Explanation:
Torgue = f * distance basically ...so if you want to increase torque with same f then the distance ( lever arm) must be increased
To increase the torque applied on a lever without exerting any more force, the length of the lever arm must be increased.
What is meant by torque?Torque is defined as the rotational analogue of force. It is the product of the applied force and the perpendicular distance.
Here,
A lever is a simple machine composed of a stiff beam and a fulcrum. Both the load and the effort are applied to the beam's ends (input force and output force, respectively).
The location on which the beam pivots is known as the fulcrum. When a force is exerted on one end of a lever, the opposite end of the lever experiences a load.
The expression for the torque acting on a lever arm is given by,
Torque, τ = Length of lever arm x Force applied
τ = L x F
From the equation, it is clear that the torque acting on the lever arm is directly proportional to its length.
τ ∝ L
Therefore, as the length of the lever arm increases, the torque applied also increases.
Hence,
To increase the torque applied on a lever without exerting any more force, the length of the lever arm must be increased.
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1 1.3.3 Test (CST): Marketing and
Question 19 of 20
What does the Federal Reserve help regulate?
A. Music
B. Clothing
C. Food
D. The economy
The Federal Reserve helps to regulate the economy of the United States. So, the correct option is D.
What is meant by marketing ?Marketing is defined as the activities done for promoting the products through creating offers and communicating to the customers.
Here,
The Federal Reserve of the United state is functioning as a Central Bank, such that they are maintaining the financial aspects of the system.
The Federal Reserve has a great role in regulating the financial system and at the same time, the establishing of the monetary policies.
The primary functions of the Federal Reserve includes the functions of maintaining the banking operations and reliable payments for the system.
Hence,
The Federal Reserve helps to regulate the economy of the United States.
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A vertical spring launcher is attached to the top of a block and a ball is placed in the launcher, as shown in the figure. While the block slides at constant speed to the right across a horizontal surface with negligible friction between the block and the surface, the ball is launched upward. When the ball reaches its maximum height, what will be the position of the ball relative to the spring launcher?.
For a vertical spring launcher is attached to the top of a block and a ball is placed in the launcher, the position of the ball will be behind the box
What will be the position of the ball relative to the spring launcher?Generally, the equation for the conservation of momentum principle is mathematically given as
(M+m) V1 = M*V2
Therefore, with the ball moving forward we have that; the ball at top it wii be behind the box,
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Answer:
Above and to the left of the spring launcher
Explanation:
The ball would be to the left of the box because the box is moving to the right at a constant speed. And when the ball goes and reaches its maximum height, the box would have passed the ball.
The main illustration in the video shows the life track of a one-solar mass star. Each point along this track represents __________.
Each point along the track of one solar mass star represents the star's surface temperature and luminosity at one time.
What is the one-solar mass star?A star having a mass equal to the mass of the Sun is called a one-solar mass star.
Its life track shows the luminous intensity as well as the surface temperature.
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Your neighbor is riding her bike around the block. When she slows down and turns a corner, what changes about her?.
Answer:
nothing
Explanation:If you ride a bike around the block and return to the exact point where you started, your displacement is zero.
By definition, displacement involves changing an object from its original position. No matter how far or for how long a body moves, if it returns to the position it started from, it has not been displaced at all. This means that the body has zero displacements.
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In which of the following forms is the energy stored in a capacitor?
(a) Charge
(b) Potential
(c) Capacitance
(d) Electric field
Answer:
Potential
Explanation:
The most accurate term is Electrostatic potential energy
It is denoted as UCIt's named like this because the force between charges or electrons is called electrostatic force .
Question 7 Points 2
The bicycle lamp glows when the bicycle's generator touches the wheel. This is because
Answer:
The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights. The faster the bicycle moves, the greater the induced voltage - and the brighter the lights.
Because of the bicycle's actions, the wheel turns a magnet internal a coil. This induces enough strength to run the bicycle's lighting fixtures. The faster the bicycle movements, the greater the caused voltage - and the brighter the lights.
What type of modern is produced with the aid of a bicycle dynamo?A trendy dynamo creates an instantaneous modern-day (DC) – a one-directional waft of electrical rate. A bicycle dynamo creates an alternating current (AC), which reverses course from time to time.
A dynamo is a tool normally positioned inside the hub of a motorcycle's wheel that converts the energy generated by means of the wheel spinning to electric power. That energy is then used to run front and rear dynamo lights at the bike, offering constantly-on illumination without the want to change the lighting.
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A stone dropped from the roof of a single-story building to the surface of the earth:
A.
falls because of the natural tendency of all objects to rest on the surface of the earth.
B.
reaches a maximum speed quite soon after release and then falls at a constant speed thereafter.
C.
speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth.
D.
speeds up because of an almost constant force of gravity acting upon it.
E.
falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward.
Answer:
D
Explanation:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion.
A=9.8m/s^2 or the gravitational accelerational
If a stone dropped from the roof of a single-story building to the surface of the earth speeds up because of an almost constant force of gravity acting upon it,there4fore the correct answer is option D.
What is gravity?It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another,
For any free-falling object, the acceleration due to gravity is constatant.
The correct response is option D if a stone thrown from the roof of a one-story structure to the surface of the ground accelerates due to an almost constant force of gravity acting upon it.
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what effect would you expect the termperature of a material to have on the ease with which electrons can be ejected from it via the photoelectric effect
Answer:
The photoelectric effect is a phenomenon in which the photoelectrons are emitted from the metal when an incident electromagnetic wave hits the metal. The incident light should have a threshold frequency to meet the work function of the metal
Which of the following is an example if an unbalanced force
A. a computer on a table
B. a man leaning against a wall
C. a girl severing a volleyball
D. fruit in a ball
Answer:
C
Explanation:
I would have to say C because the girl is constantly moving in the act of serving the volleyball.
A drill bit in a hand drill is turning at 1200 revolutions per minute (1200 rpm). Express this angular speed in radians per second (rad/s).
Answer:
the answer will be about 126 rad/s
Explanation:
is water a pollutant?
Please help
A nonsinusoidal electromagnetic wave like that described in Section 32.2 has uniform electric and magnetic fields. The magnitude of the Poynting vector for this wave is 11.0 W/m2. Find the magnitude of the electric field.
The magnitude of the electric field will be 64.38 V/m. Mathematically, the electric field is found as the ratio of the voltage per unit length.
What is electric field?A physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is referred to as an electric field.
The magnitude of the electric field in terms of the pointing vector for this wave is found as;
[tex]\rm E_{MAX} = \sqrt{S \times c \times \mu_0 }[/tex]
Where,
E is the electric field
c is the speed of light
[tex]\mu_0[/tex] is the permeability
On Putting the given data ;
[tex]\rm E_{MAX} = \sqrt{11.0 \times 3 \times 10^8 \times 4 \times \pi \times 10^{-7}} \\\\\ \rm E_{MAX} =\sqrt{4144.8} \\\\ E_{MAX} =64.38 \ V/m[/tex]
Hence, the magnitude of the electric field will be 64.38 V/m.
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Name one non-metal that is a good conductor and why??
Answer:
silver
Explanation:
It is because it contains a higher number of movable atoms ( free electrons)
Science!!
How much TIME would it take for Plutonium-239 to decay 50g of its original substance to 12.5g?
4. If everything lines up perfectly for superposition to occur, these massive waves would break with a force of 100
metric tons per m². She compares this to how much force standing on a car?
If everything lies perfectly for superposition to occur, the force on a car is 1000 N.
What is superposition?Superposition is the phenomenon of placing one wave over the other so that they coincide. The resultant force will be zero.
The force in kg will be
1mteric ton = 1000 kg
1metric ton per m²= 1000 N
1000 N force is applied to a car, which will be equal and opposite to the massive wave.
The equal force will act on a car equal to 1000 N.
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Two bodies of mass m1 and m2 are let fall freely from heights h1 and h2 respectively. The ratio of time taken by the bodies to fall through these heights is :
Answer:
√h₁/h₂
Explanation:
In free fall, the square of the time taken by the body is directly proportional to the height from which it is dropped.
t₁² ∝ h₁t₂² ∝ h₂Ratio
t₁²/t₂² = h₁/h₂t₁/t₂ = √h₁/h₂According to second equation of kinematics for free fall
h=-1/2gt²So
[tex]\\ \rm\Rightarrow h\propto t^2[/tex]
[tex]\\ \rm\Rightarrow h_1:h_2::t_1^2:t_2^2[/tex]
[tex]\\ \rm\Rightarrow t_1:t_2::\sqrt{h_1}:\sqrt{h_2}[/tex]
Peristalsis is the action caused by contractions of muscles in this structure in the digestive system...
Group of answer choices
liver
pancreas
esophagus
trachea
Answer:
I believe the answer is esophagus
If force = mass x acceleration, then if an object has a mass of 10 grams
and the acceleration of 20 m/s, what is the force on the object?
Answer:
10g to kg=0.01
20×0.01=0.2
Force of 0.2N
13. A type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. What force constant is needed to produce a period of 0.500 s for a 0.0150-kg mass?
The answer is 2.37N/m but please show your work.
The force constant that is needed to produce a period of 0.500 s for a 0.0150-kg mass is 2.37 N/m
Data obtained from the questionPeriod (T) = 0.5 s
Mass (m) = 0.015 Kg
Pi (π) = 3.14
Spring constant (K) =?
How to determine the spring constantThe spring constant can be obtained by using the formula for calculating the period of simple harmonic motion. This is illustrated below
T = 2π√(m /K)
Square both side
T² = 4π²m / K
Cross multiply
T² × K = 4π²m
Divide both side by T²
K = 4π²m / T
K = (4 × 3.14² × 0.015) / 0.5²
K = 2.37 N/m
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what characteristics are shared by both heating and cooling curves? choose 4
The characteristics shared by both heating and cooling curves is that phases changes when the temperature stays the same.
What is heating and cooling?Heating is the process by which the temperature of a place or substances or object is increased.
Cooling Is the process of lowering the temperature of a substance or object by using conditioners or by freezing .
Therefore, The characteristics shared by both heating and cooling curves is that phases changes when the temperature stays the same.
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A bird sitting on a high power line:
(a) gets killed instantly
(b) gets a mild shock
(c) gets a fatal shock
(d) is not affected practically
Answer:
(d) is not affected practically
Explanation:
A bird sitting on a high power line is not affected practically.
This is because both of its legs are at the same potential, and current cannot flow through its body.
Answer:
option D
Explanation:
The bird sitting on a high power line but the bird is not touching ground by its body parts .
Hence there is no way electricity can pass through its body to earth
Thus it won't get any shock .