Answer:
Well velocity is the varaible with direction
Explanation:
Mention the key scientists contributed in the following realizations and list the years: 1- Electric charges (positive and negative) 2- Coulomb's law 3- Electric field 4- Gauss's law Type your answer and keep everything to less than 200 words.
Answer:
1- Electric charges (positive and negative) - Benjamin Franklin in 1742.
2- Coulomb's law: Charles Augustin Coulomb from 1764 to 1772.
3- Electric field: Michael Faraday - 1821
4- Gauss's Law: Joseph Louis Lagrange was the first to formulate the rule in 1773, followed by Carl Friedrich Gauss in 1867.
Explanation:
The Electric charge: In 1742, an American orator and inventor named Benjamin Franklin designed the positive and negative values of the charge.
Coulomb's law: The theory was first published in 1785 by Charles Augustin de Coulomb, a French physicist who was instrumental and prominent in the advancement of electromagnetism theory.
Gauss Law: Carl Friedrich Gauss developed this law in 1835. It was not released until 1867, However, Classical electrodynamics is based on this law.
Prove these statements:______.
(a) As long as you can neglect the effects of the air, if you throw anything vertically upward, it will have the same speed when it returns to the release point as when it was released.
(b) The time of flight will be twice the time it takes to get to its highest point.
Answer:
a. The final speed , v' when it returns is the same speed, u as when it was released. v' = u
b. The time of flight T equals twice the time taken to reach the highest point, t. T = 2t
Explanation:
(a) As long as you can neglect the effects of the air, if you throw anything vertically upward, it will have the same speed when it returns to the release point as when it was released.
Using v² = u² - 2gh, we find the maximum height the object reaches. With u = initial vertical velocity, v = velocity at maximum height = 0 m/s (since it momentarily stops), g = acceleration due to gravity and h = maximum height
So, v² = u² - 2gh
0² = u² - 2gh
0 = u² - 2gh
-u² = -2gh
h = -u²/-2g
h = u²/2g
On its return trip to the point where it is released, the distance covered is h and its initial velocity u' = 0
With v' as the final velocity, we use
v'² = u'² + 2gh
substituting the values of the variables into the equation, we have
v'² = 0² + 2g(u²/2g)
v'² = 0² + u²
v'² = u²
taking square-root of both sides, we have
√v'² = √u²
v' = u
So, the final speed , v' when it returns is the same speed u as when it was released. v' = u
(b) The time of flight will be twice the time it takes to get to its highest point.
At the highest point, its velocity is zero.
Using v = u - gt where u = initial velocity, v = final velocity(velocity at highest point) = 0 (since it is momentarily at rest), g = acceleration due to gravity and t = time taken to reach the highest point.
So, substituting the values of the variables into the equation, we have
v = u - gt
0 = u - gt
-u = -gt
t = u/g
On its return trip, since we know its final velocity = u and its initial velocity is 0 m/s, again, using
v' = u' + gt' where u' = initial velocity = 0 (since it is at its highest point), v' = final velocity = u (velocity on return to release point), g = acceleration due to gravity and t' = time taken to reach release point from highest point
So, substituting the values of the variables into the equation, we have
v' = u' + gt'
u = 0 + gt'
u = gt'
t' = u/g = t
So, the time of flight, T = time taken to reach highest point + time taken to return to release point
T = t + t'
T = u/g +u/g
T = 2u/g
T = 2t
So, the time of flight T equals twice the time taken to reach the highest point, t. T = 2t
Take 100 points look the picture
Answer:
An aqueous stagnant layer that overlies the apical membrane and the subepithelial blood flow are potential barriers to the absorption of drugs that readily penetrate the absorbing cell of the epithelium. The apical, basal, and basement membranes are potential barriers to the absorption of less permeable drugs.
claiming points because question is old + no keywords in title
How do you add sound waves?
The addition of two sound waves produces a new wave of higher amplitude if their compressions and refractions line up. It is also known as constructive interference.
What is interference?Interference can be described as a phenomenon in which two waves combine by adding at every single point in space and time, to form a resultant wave of greater or lower amplitude.
Constructive and destructive interference occurs in the interaction of waves that are correlated with each other because they come from the same source.
When two sound waves propagate in the same direction in phase with each other, their amplitude gets added, and the resultant wave is produced from constructive interference.
When two waves interfere with each other and have a displacement in the opposite direction. When a crest of a wave meets the trough of another wave, the waves undergo destructive interference.
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which of the following changes will increase the frequency of an oscillating pendulum?
a. an increase in the mass of the pendulum.
b. an increase in the initial height of release.
c. an increase in the length of the rope.
d. more than one of the above
e. none of the above
explain your answer.
NO LINKS.
Answer:
e. none of the above
Explanation:
The frequency of an oscillating pendulum is the number of oscillation per unit time.
Mathematically, the frequency of an oscillating pendulum is given by the formula;
F = 1/2π√(k/m)
Where;
F is the frequency of oscillation.
k is the spring constant.
m is the mass of the spring.
Hence, none of the changes mentioned will increase the frequency of an oscillating pendulum.
The lower the temperature of the solvent, the faster the solute will dissolve. True False
Answer:
false.
Explanation:
Since temperature and kinetic energy of molecules are proportional, the more we increase the temperature of the solvent, the faster the solute will dissolve.
This increase of kinetic energy allows the solvent molecules to more effective break apart the solvent molecules that are held together by intermolecular forces.
A person has a far point of 50 cm. If he is wearing glasses 2 cm from the eyes, determine
the power of the lens needed for him to see distant object clearly.
Answer:
The power will be "2.08 D".
Explanation:
According to the question,
The location of the image form lens,
[tex]d_i=50-2[/tex]
[tex]=48 \ cm[/tex]
We know that,
⇒ [tex]\frac{1}{d_i} -\frac{1}{d_o} =\frac{1}{f}[/tex]
here,
[tex]d_o[/tex] = Object location
[tex]d_i[/tex] = Image location
[tex]f[/tex] = Focal length
On putting the values in the above expression, we get
⇒ [tex]\frac{1}{48} -\frac{1}{\infty} =\frac{1}{f}[/tex]
[tex]f=48 \ cm[/tex]
or,
[tex]f=0.48 \ m[/tex]
hence,
The refractive power will be:
⇒ [tex]P=\frac{1}{f}[/tex]
[tex]=\frac{1}{0.48}[/tex]
[tex]=2.08 \ D[/tex]
What are the names and number of of atoms in a molecule of nitrous oxide,N2O?
Answer:
2 nitrogen and 1 oxygen,
Explanation:
N2=2 nitrogen
O= a single element
When gas condense it ______ heat and temperature _____
A. gain heat, temperature decrease
B. gain heat, temperature increase
C. loses heat, temperature doesn't change
Answer:
C
Explanation:
Usain Bolt is wicked fast. In fact, he is the fastest human in the world and
ran at a crazy 10.1 m/s in the Olympic Games. What is his mass if he had
9.890 Joules of kinetic energy in that race?
Explanation:
KE = (1/2)mv^2 ---> m = 2KE/v^2 = 2(9.890 J)/(10.1 m/s)^2
= 0.194 kg
Note: I think there's something wrong with the energy value given. The mass value for Usain Bolt is too small. That's less than a pound!
You are in the year where the earth has no more land available for houses you decide to build an apartment up and need things to survive in each earths 5 layers (troposphere,stratosphere, mesosphere, thermosphere, exosphere) Question: what things would you need to survive the mesosphere
PLS I RLLY NEED SOME HELP
The things that I will need to survive the layer of the earth called the mesosphere would be thick clothings.
What are the 5 layers of the earth?The five(5) layers of the earth include the following such as:
troposphere,stratosphere, mesosphere, thermosphere, and exosphere.The Mesosphere is one of the layers of the earth that is found directly above the stratosphere and then below the thermosphere.
The characteristics of the mesosphere is that the temperature rises due to reduced absorption of solar radiation and increased cooling by CO2 radiative emissions.
Therefore, for an individual to survive and live effectively at the Mesosphere layer of the earth, such needs thick clothings.
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Subtract the following and give the answer using significant figures 3.400-0.7591
Answer:
the answer is 2.6409.
Explanation:
i asked my teacher
When floating a ping-pong ball with a hairdryer, which two forces are balanced?
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
There are two forces which are being balanced :
(Ⅰ) The force of gravity which is pushing the ping-pong ball downwards.
(Ⅱ) The force of the air that's coming from hairdryer which is pushing ping-pong ball upwards.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
A perpendicular force is applied to a certain area and produces a pressure P. If the
same force is applied to a twice bigger area, the new pressure on the surface is:
Answer:
p/2
Explanation:
Which law of motion accounts for the following statement? An apple accelerates as it falls from a tree
The law of motion that accounts for an apple accelerating as it falls from a tree is the law of gravity, specifically Newton's Second Law of Motion.
Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In the case of an apple falling from a tree, the net force acting on it is the gravitational force pulling it toward the Earth. The acceleration of the apple is therefore determined by the strength of this gravitational force and the mass of the apple.
As the apple falls from the tree, it accelerates toward the ground due to the gravitational force acting on it. The faster the apple falls, the greater its acceleration. This acceleration is commonly referred to as acceleration due to gravity, which is a constant value of 9.81 m/s^2 near the surface of the Earth.
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define quant......am physics
Answer:
✍ What is quantum physics?➳ It's the physics that explains how everything works; the best description we have of the nature of the particles that make up matter and the forces with which they interact. Quantum physics underlies how atoms work, and so why chemistry and biology work as they do.At what separation will two charges, each of magnitude 6.0 μC, exert a force of 0.70 N on each other?
At separation of 1470 meters, the two charges exert a force of 0.70 N on each other.
What is electric force?Electric force is the interaction between any two charged objects that can be either attractive or repelling. Newton's rules of motion, which apply to all forces, explain how each one affects the target body and how it does so. The electric force is one of the many forces that operate on objects.
We know that electric force can be mathematically defined as:
F = kQq/r²
0.70 = 9.0 × 10⁹ × (6.0×10⁻⁹)²/r²
r = 1.47 meter.
Hence, the separation between two charges is 1.47 meters.
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plzz help .....When comparing a prokaryotic cell to a eukaryotic cell, an important difference is that the prokaryotic cell
A.is simple, performing limited functions.
B.is relatively small in size and unorganized.
C.has its genetic information stored in the nucleus.
D.has no structures that allow it to store food.
Answer:
C
Explanation:
4. How many excess electrons does a balloon that was rubbed on a child's hair and
now has a charge of 4.0 x 107 Coulombs?
The number of excess electrons is 4.0 x 107 Coulombs divided by 1.60 x 10-19 Coulombs, which is 2.5 x 1026 electrons.
What is electrons?Electrons are particles of matter that carry a negative electrical charge. Electrons are the smallest particles in the atom and are responsible for most of the atom's mass. Electrons orbit around the nucleus of the atom and are held together by the electromagnetic force. Electrons have a property called spin, which can have a value of either +1/2 or -1/2. Electrons are found in all elements and are important in chemical reactions as they are able to move around and form bonds with other atoms. Electrons are also important in electricity and magnetism.
The number of excess electrons on the balloon is equal to the charge of the balloon divided by the charge of an electron. Since the charge of an electron is 1.60 x 10-19 Coulombs, the number of excess electrons is 4.0 x 107 Coulombs divided by 1.60 x 10-19 Coulombs, which is 2.5 x 1026 electrons.
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The position-versus-time plot of a boat positioning itself next to a dock is shown in the figure (Figure 1).
Rank the six points indicated in the plot order of increasing value of the velocity v, starting with the most negative. Rank the points in order of increasing value of the velocity. To rank items as equivalent, overlap them.
Incorrect: Try Again; 2 attempts remaining: no points deducted
The points in order of increasing value of the velocity can be ranked as:
B < C < A ≡ F < E < D.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
According to the figure:
The points in order of increasing value of the velocity can be written as:
B < C < A ≡ F < E < D.
As the displacement becomes from positive to negative near point B, it has the lowest velocity and as the displacement becomes from negative to positive near point D, it has the highest velocity
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Explain using physics vocabulary WHY the volume increases as the temperature increases.
Answer:
P V = n R T ideal gas equation
V = k T where k = a constant and equals k = n R / P
V is proportional to T when other factors are constant
This theory of motivation focuses on finding the right level of stimulation. An organism tries to find behaviors that actually increase arousal because everything else bores them.
*
2 points
Cognitive Theory
Hierarchy of Needs
Drive-Reduction Model
Optimal Arousal Theory
Optimal Arousal theory focuses on finding the right level of stimulation.
What is Optimal Arousal theory?William James (1842–1910), frequently referred to as the father of psychology in the United States, made significant contributions to early studies on motivation.
James proposed a number of instincts that help with survival as the driving forces behind conduct . An instinct is a species-specific pattern of behavior that is not taught, according to biology.
But there was a lot of disagreement over what exactly constitutes instinct among James's contemporaries. James postulated a number of unique human instincts, although many of his contemporaries had different lists.
Therefore, Optimal Arousal theory focuses on finding the right level of stimulation.
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It is found that the most probable speed of molecules in a gas at equilibrium temperature
T2 is the same as the root-mean-square speed of the molecules in this gas when its equilibrium
temperature is T1. Find T2/T1.
Answer:
[tex]\frac{T_2}{T_1} = 1[/tex]
Explanation:
The root mean square velocity of the gas at an equilibrium temperature is given by the following formula:
[tex]v = \sqrt{\frac{3RT}{M} }[/tex]
where,
v = root mean square velocity of molecules:
R = Universal Gas Constant
T = Equilibrium Temperature
M = Molecular Mass of the Gas
Therefore,
For T = T₁ :
[tex]v = \sqrt{\frac{3RT_1}{M} }[/tex]
For T = T₂ :
[tex]v = \sqrt{\frac{3RT_2}{M} }[/tex]
Since both speeds are given to be equal. Therefore, comparing both equations, we get:
[tex]\sqrt{\frac{3RT_1}{M} }=\sqrt{\frac{3RT_2}{M} }\\\\\frac{T_2}{T_1} = 1[/tex]
The uniform beam has a weight W and length L and is supported by a pin at A and cable BC ( figure 1)
Part A
Determine the horizontal and vertical components of reaction at A
Express your answers in terms of some or all of the variables W, R. Φ and θ). Enter your answers separated by a comma.
View Available Hint's)
Aa + Ay = ____
Parts B
Determine the one cable car necessary to hold the beans position shown
Express your answers in terms of some or all of the variables W, R. Φ and θ).
The reaction is in A in vertical direction is W(2cosϕsinθ−sinϕcosθ)/2sin(θ−ϕ).
What is Normal Stress and Strain?In terms of psychology, "stress" and "strain" are sometimes used interchangeably in popular culture, as in the expressions "I'm feeling stressed" or "I'm under a lot of pressure."
In engineering, these phrases have specific, technical meanings. If a hook in the steel wire is attached,
If you hang the wire from the ceiling while placing a weight on the lower end, it will sag. By dividing the length change by the starting length, the strain in the wire may be computed.
Thus, as per the given scenario, W(2cosϕsinθ−sinϕcosθ)/2sin(θ−ϕ) will be the equation.
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A 10 kg box is on an inclined plane that is 40 degrees above the horizontal. It is sliding
down with a constant velocity.
a. Draw a free body diagram with Fg, FN, F₂ and Ff.
b. What is the weight of the box?
What is the normal force of the box?
c. What is the force of friction acting on the box?
d. What is the net force acting on the box?
A horizontal force of 10.0 N is acting on a 10 kg box that is sliding to the right along the floor with velocity v.
What are the assumptions for drawing a free-body diagram?Most people make the common assumptions of rigid body action and ignoring air resistance and friction. In statics, all forces and moments must balance to zero; if they don't, the body is accelerating and the laws of statics do not apply, according to the physical interpretation.
The specific situation and the presumptions used will determine how many forces and moments are displayed. Most people make the common assumptions of rigid body action and ignoring air resistance and friction.
In statics, all forces and moments must balance to zero; if they don't, the body is accelerating and the laws of statics do not apply, according to the physical interpretation. The resultant forces and moments in dynamics can have non-zero values.
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Ms. Mayo challenged her students to build a pendulum that would hit a block of wood and make it travel the farthest distance. The group that moved the block of wood the most would win a prize. One group's experimental data is shown above.
What is this group's independent variable?
A) height of bob drop
B) mass of pendulum bob
C) length of bob string
D) distance block moves
Answer:
B) mass of pendulum bob
You are asked to design a spring that will give a 1110 kg satellite a speed of 3.55 m/s relative to an orbiting space shuttle. Your spring is to give the satellite a maximum acceleration of 5.00g. The spring's mass, the recoil kinetic energy of the shuttle, and changes in gravitational potential energy will all be negligible.
(a) What must the force constant of the spring be?
(b) What distance must the spring be compressed?
Answer:
Explanation:
Kinetic energy of satellite = 1/2 m v²
= .5 x 1110 x 3.55²
= 6994.39 J
This energy comes from the elastic energy of compressed spring
elastic energy = 1/2 k d² where k is elastic constant and d is compression in spring .
1/2 k d² = 6994.39 J
kd² = 13988.77 --------------------------- (1)
force created by spring = k d
acceleration = force / mass
= k d / 1110
Given ,
k d / 1110 = 5 x g = 5 x 9.8 = 49
kd = 54390 ------------------------------------------------- ( 2 )
dividing ( 1 ) and ( 2 )
d = 13988.77 / 54390
= .25719 m
= 25.72 cm
kd = 54390
k x .25719 m = 54390
k = 211477.9 N /m
a garden hose of diameter 2cm is used to fill 1000 litre container in a time of 10 minutes.calculate the flow rate in cubic cm per second
Answer: Flow rate 1670 cm³/s
Explanation: Cross section A = π · (2 cm)² = 12.56 cm²
V = 1000 l , t = 10 min = 600 s
dV / dt = 1000 l / 600 s = 1,67 l/s = 1670 cm³ /s
That was not asked,
dV / dt = vA and flow speed v = (dV/dt)/A = 133 cm/s
A box is dropped out of a moving airplane. The airplane is traveling at 50m/s East. The box is dropped from rest with respect to the airplane. The box travels a vertical distance of 40 m before landing on a trampoline. The airplane continues traveling at a constant speed after the box is dropped and the wind resistance on the falling box is negligible
The horizontal distance travelled by the box is 143 m.
What is the horizontal distance travelled by the box?
The horizontal distance travelled by the box is calculated by determining the time of motion of the box and the horizontal velocity of the airplane.
The time of motion of the box from the vertical height in which it was dropped is calculated as follows;
h = vt + ¹/₂gt²
where;
v is the initial vertical velocity of the box = 0t is the time of motion of the boxg is acceleration due to gravityh is the height of fall of the boxh = 0 + ¹/₂gt²
t = √ ( 2h / g )
t = √ ( 2 x 40 / 9.8 )
t = 2.86 seconds
The horizontal distance travelled by the box is calculated as follows;
d = Vₓ t
where
Vₓ is the horizontal velocity of the airplanet is the time of motiond = ( 50 m/s ) x ( 2.86 s )
d = 143 m
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The complete question is below;
A box is dropped out of a moving airplane. The airplane is traveling at 50m/s East. The box is dropped from rest with respect to the airplane. The box travels a vertical distance of 40 m before landing on a trampoline. The airplane continues traveling at a constant speed after the box is dropped and the wind resistance on the falling box is negligible. Find the horizontal distance travelled by the box.
What is the power of a lightbulb that has a current of 0.480 A at 120.0 V?
Answer:
The power is 57.6 watts
Explanation:
We can use the Electric Power Equation to evaluate the power.
Electric Power Equation
[tex]P=IV[/tex]
[tex]P[/tex] is the power in watts
[tex]I[/tex] is the current in amps
[tex]V[/tex] is the voltage in volts
Our lightbulb has current of 0.480 A and a voltage of 120.0 V.
[tex]I=0.480\\V=120.0[/tex]
Now we can evaluate power.
Substitute our values in for the variables.
[tex]P=0.480*120[/tex]
[tex]P=57.6[/tex]