Which of the following is a sign of puberty?
A.
intense changes in hormone balance
B.
increased height and strength
C.
development of sexual characteristics
D.
all of the above
Please select the best answer from the choices provided.
A
B
C
D
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
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
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]
Which would help you perform a basketball skill well with
speed?
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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Earth's gravitational
attraction
vanishes at
force of
force
(a) 6400 km (b) infinity
(c) 42300 km
(d) 1000 km
Answer:
b> infinity
Explanation:
i think b is the correct one
Answer:
(B) Infinity
Explanation:
Gravity can basically never become zero except hypothetically at infinity.
A set of charged plates is
separated by 2.22*10^-4 m. When
5.24*10^-9 C of charge is placed
on the plates, it creates a potential
difference of 240 V. What is the
area of the plates?
(The answer is *10^-4 m^2. Just fill
in the number, not the power.)
Answer:
5.49×10¯⁴ m²
Explanation:
From the question given above, the following data were obtained:
Distance (d) = 2.22×10¯⁴ m
Charge (Q) = 5.24×10¯⁹ C
Potential difference (V) = 240 V
Permittivity of free space (ε₀) = 8.85×10¯¹² F/m
Area (A) =?
Thus, the area of the plate can be obtained as follow:
Q = ε₀AV /d
5.24×10¯⁹ = 8.85×10¯¹² × A × 240 / 2.22×10¯⁴
5.24×10¯⁹ = 2.12×10¯⁹ × A / 2.22×10¯⁴
Cross multiply
2.12×10¯⁹ × A = 5.24×10¯⁹ × 2.22×10¯⁴
Divide both side by 2.12×10¯⁹
A = (5.24×10¯⁹ × 2.22×10¯⁴) / 2.12×10¯⁹
A = 5.49×10¯⁴ m²
Thus, the area of the plates is 5.49×10¯⁴ m².
Answer:
it's actually 5.48
Explanation:
helpp tyy
Which of the following is a way to make magnets?
heating
freezing
pressure
heating or pressing but heating is most appropriate, so the answer is heating.
Six vectors (a through f ) have the magnitudes and directions indicated in the figure. (Figure 1)
1.Rank the vector combinations on the basis of their magnitude.
Rank from largest to smallest. To rank items as equivalent, overlap them.
a+c
f+c
d
a+b
a+e
a+d
2.Rank the vector combinations on the basis of their angle, measured counterclockwise from the positivexaxis. Vectors parallel to the positivexaxis have an angle of0^\circ. All angle measures fall between0^\circand360^\circ.
Rank from largest to smallest. To rank items as equivalent, overlap them.
a+d
f+c
a+b
a+e
a+c
d
1. The rank of the vector combinations on the basis of their magnitude
a+b = a +d > a+c > f +c = d > a + e.
2. The rank of the vector combinations on the basis of their magnitude
a+d = a +b > a+c > f +c =d > a+e.
What is vector quantity?Any physical quantity having both magnitude and direction is called vector quantity.
According to figure:
a = 2 unit b = 2 unit c = 1 unit d = 2 unit e = 1 unit and f = √5 unit.
a + c = 2+1 unit = 3 unit
a + b = 2√2 unit
a + e = 2 -1 = 1 unit
a +d = 2√2 unit
f+ c = 2 unit
a+d = 2√2 unit
f+c = 2 unit
a+b = 2√2 unit
a+e = 1 unit
a+c = 3 unit
Hence, rank of the vector combinations on the basis of their magnitude
a+b = a +d > a+c > f +c = d > a + e.
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A graph of v(t) is shown for a world-class track sprinter in a 100 -m race. (See figure below. For each answer, enter a number.)
(a) What is his average velocity (in m / s ) for the first 4 s} ?
______ m/ s
(b) What is his instantaneous velocity (in m / s ) at t=6 s ?
______ m / s
(c) What is his average acceleration (in m / s²) between 0 and 4s?
________m / s²
(d) What is his time (in s) for the race?
______ s
a) The average velocity at 4s is 12 m/s
b) The instantaneous velocity at t= 6s is 12 m/s
c) The average acceleration is; 12 - 0/ 4 - 0 n= 3 m/s^2
d) The time for the race is 10 s
What is the velocity time graph?We know that the velocity time graph is the kind of set up that has two axis and we can be able to use it to be read off the velocity of the acceleration of the object. I would want us to recall that the acceleration is the rate of change of the velocity of the object with time.
Now we have that;
The graph for the velocity of the object can be obtained by looking at the image that has been shown and then we read off the points that are on the graph. The vertical axis shows the velocity of the graph while the horizontal axis shows the time that is covered in the graph.
The acceleration would be the ratio of the change in the velocity to the change in the time of the object.
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Two long straight parallel wires separated by 1m carry 20A current each in the same direction. Find the magnitude and direction of the magnetic field at a) point midway between the wires; b) point 25cm to the right of point midway between the wires; c) point 75cm to the right of point midway between the wires; d) point 25 cm above one of the wires.
Answer:
Explanation:
a )
At a point midway between the wires , magnetic field due to two wires will be equal and opposite so they will cancel each other . Therefore , net magnetic field will be zero .
b )
At a point 25cm to the right of point midway between the wires
distance of this point will be .25 m from one wire and .75 m from other wire .
Magnetic field due to a current carrying wire can be given by the following expression .
B = (μ₀ / 4π ) x 2I / R where I is current and R is distance of the point
= 10⁻⁷ x 2I / R
For the wire at a distance of .25 m
magnetic field B₁ = 10⁻⁷ x 2 x 20 / .25
= 160 x 10⁻⁷ T .
For the wire at a distance of .75 m
magnetic field B₂ = 10⁻⁷ x 2 x 20 / .75
= 53.33 x 10⁻⁷ T .
These fields are opposite to each other , so
net magnetic field = 160 x 10⁻⁷ T - 53.33 x 10⁻⁷ T
= 106.67 x 10⁻⁷ T .
If the wires are horizontal and current is flowing away from the observer , net magnetic field will be in vertically upward direction .
c )
At a point 75cm to the right of point midway between the wires
The point will be .25 m from one wire and 1 .25 m from other wire . And the magnetic field will be aligned in the same direction .
For the wire at a distance of .25 m
magnetic field B₁ = 10⁻⁷ x 2 x 20 / .25
= 160 x 10⁻⁷ T
For the wire at a distance of 1.25 m
magnetic field B₂ = 10⁻⁷ x 2 x 20 / 1.25
= 32 x 10⁻⁷ T
As the fields are aligned in the same direction
Net magnetic field = 160 x 10⁻⁷ T + = 32 x 10⁻⁷ T
= 192 x 10⁻⁷ T .
If the wires are horizontal and current is flowing away from the observer , net magnetic field will be in vertically downward direction.
Physics Question!!!!!
Answer:
bbibinononobyvtcrxrxextcyvubuvububububububbu
Answer:
im just gettin these points babbbyyyyyy
Explanation:
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
8. Jane rides a sled down a slope of angle θ at constant speed v. Determine the coefficient of kinetic friction between the sled and the slope. Neglect air resistance.
(A) μ=gsinθ (B) μ=mgcosθ (C) μ=tanθ (D) μ=gcosθ
Answer:ssssw
Explanation:
Which of the following best illustrates an application of the principles of behaviorism?
A therapist is helping a client explore feelings about past events.
O A parent is using "time out" as a consequence for bad behavior.
O A friend is listening intently and showing concern for another.
O A mechanic is developing a mental map of the engines she routinely fixes.
The statement that best illustrates the application of the principles of behaviorism is -
"A parent is using "time out" as a consequence for bad behavior".
What is behaviorism?The theory that human and animal behaviour can be explained in terms of conditioning, without appeal to thoughts or feelings, and that some mental conditions are best treated by altering behaviour patterns.
Given are the applications of the principles of behaviorism.
The statement that best illustrates the application of the principles of behaviorism is -
"A parent is using "time out" as a consequence for bad behavior".
Therefore, the statement that best illustrates the application of the principles of behaviorism is -
"A parent is using "time out" as a consequence for bad behavior".
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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
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
You are in space station in orbiting around mars, will your weight increase, or decrease explain.
Answer and Explanation:
Your mass will always stay the same, the same as it is on Earth.
It is your weight that changes, which is why you would jump higher on the moon and on mars. You would have a decrease in weight, allowing you to jump higher and stay in the air longer.
#teamtrees #PAW (Plant And Water)
When the Apollo 11 lunar module Eagle lands on the moon it comes to a stop 10m above the surface of the moon. The last 10m it freely falls to the surface of the Moon.
i) How long does it take for the Eagle to touch down?
ii) What is the velocity of the lunar module when it hits the surface of the moon?
Answer:
i) 3.514 s, ii) 5.692 m/s
Explanation:
i) We can use Newton's second law of motion to find out how long does it take for the Eagle to touch down.
as the equation says for free-falling
h = ut +0.5gt^2
Here, h = 10 m, g = acceleration due to gravity = 1.62 m/s^2( on moon surface)
initial velocity u = 0
10 = 0.5×1.62t^2
t = 3.514 seconds
Therefore, it takes t = 3.514 seconds for the Eagle to touch down.
ii) use Newton's 1st equation of motion to calculate the velocity of the lunar module when it hits the surface of the moon
v = u + gt
v = 0+ 1.62×3.514
v= 5.692 m/s
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:
a boy is swinging a toy on apiece of string in a vertical circle. the toy has mass 150g and the radius of circle is 0.8m. a) he swings the toy with a linear velocity 2m/s. will the top move in a circle? explain your answer.
The top move will in a circle because there is tension at the top which will add up with the weight of the toy to maintain equal centripetal force providing the circular motion.
What is tension of the top of the vertical circle?
The tension experienced by the top of the vertical circle is calculated by using the following formula.
T = Fc - W
where;
Fc is the centripetal force of the toyW is the weight of the toyT = mv²/r - mg
where;
m is the mass of the toyv is the linear speed of the toyg is acceleration due to gravityr is the radius of the vertical circleThe tension experienced by the toy at the top of the vertical circle is calculated as follows;
T = ( 0.15 x 2² / 0.8 ) - ( 0.15 x 9.8 )
T = 0.75 - 1.47
T = -0.72 N
Thus, with the negative tension at the top of the vertical circle, the sum of the tension force and the weight of the toy will be equal to the centripetal force to maintain the orbit of the toy in a circular path.
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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 wire with a current of 5.2 A is at an angle of 45° relative to a magnetic field of 0.87 T. What is the force exerted on a 1.2 m length of the wire
Answer:
F = I L X B = I L B sin theta
F = 5.2 * 1.2 * .87 sin 45 = 3.84 N in the direction of (L X B)
Note: L and B must be at right angles for F = I L B
describe wht happends to the motion of the moving object when there is no resultant force acting on it
Answer:
it keeps moving until a force disturbs it
Explanation:
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
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.
The slope of a velocity time graph will give___
Answer:
THE ANSWER IS ( acceleration of the object )Write 3 – 4 sentences evaluating the use of nuclear fission to generate electric energy. Provide at least one point in favor of and two points against using fission.
Answer:
One point in favor of using nuclear fission to generate electric energy is that it is a relatively low-carbon option, producing fewer greenhouse gas emissions than fossil fuels. However, there are several points against using fission as an energy source. One is that it produces radioactive waste that can be difficult and costly to dispose of safely. Another is that there is the risk of accidents or leaks, which can have serious consequences for both people and the environment. Additionally, the construction of nuclear power plants is expensive and time-consuming, and the plants themselves have a limited lifespan.
Taylor has set this fitness goal: I will go to the YMCA and lift weights for 30 minutes every other day for the entire month of January. What is MOST likely TRUE about this goal?
Since Taylor has set this fitness goal: I will go to the YMCA and lift weights for 30 minutes every other day for the entire month of January. The option that MOST likely TRUE about this goal is option A:It is a short-term goal.
What is the fitness goal about?A short-term goal is a goal that can be achieved within a relatively short period of time, usually less than a year. In this case, the goal is to go to the YMCA and lift weights for 30 minutes every other day for the entire month of January.
In this case, Taylor's goal is to go to the YMCA and lift weights for 30 minutes every other day for the entire month of January. This goal is specific, as it clearly states what Taylor wants to accomplish, and it is measurable.
This goal can be achieved within the month of January and it's a specific, measurable and time-bound goal, which are characteristics of short-term goals.
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See full question below
Taylor has set this fitness goal: I will go to the YMCA and lift weights for 30 minutes every other day for the entire month of January. What is MOST likely TRUE about this goal?
It is a short-term goal.
It is a long-term goal.
It is an unrealistic goal.
It is a mental health goal.
Answer:it’s a short-term goal
Explanation:
because it’s only for the month of January she will be doing this goal.