The statement that is true about height and strength is that In boys, the strength spurt occurs about a year after their height spurt
What is puberty?Puberty is the transformational change that occur between childhood and adulthood. It is a stage of maturity
Height of a person is the distance from the feet of a person to the peak or his head.
Strength is the ability of a person to be very strong and can do vigorous things.
Therefore, The statement that is true about height and strength is that In boys, the strength spurt occurs about a year after their height spurt.
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Choose all the answers that apply.
Erosion can be reduced by:
1. contour plowing
2. putting up fences
3. planting trees
4. removing topsoil
Answer:
The answer will be #3 and #4
Explanation:
Because the more the organisms live in the topsoil the weaker the soil would get and most likely that would happen and planting trees stop soil erosion because when the trees absorb water underground it makes the soil firm and tight just like the (abnormal) soil you would see near few feet near most trees.
PLS HELP! VERY URGENT! Choose three answers in the question below. I will give five stars the thanks and BRAINLIEST! I will give 50 point for this one! And brainly, this is only my assignment and its just one question.
Answer:
sawing a board in half
dissolving sugar in water
a block of ice subliming
Explanation:
Answer: Dissolving sugar in water, burning a match, and sawing a board in half
Explanation: Dissolving sugar in water is an example of a physical change. Here's why: A chemical change produces new chemical products. In order for sugar in water to be a chemical change, something new would need to result. A chemical reaction would have to occur.
When a match burns, it undergoes a chemical change. Matches use sulfur, phosphate and a friction agent held together by a binding agent. With a match, heat ignites the phosphorous on the head of the match
cutting of wood is a physical change because only physical property of wood is changed and no new substance is formed. the properties of wood remains the same. burning of wood is a chemical change as new substances are formed that is smokes and CO2. it is different from wood.
I hope this is the correct answer im pretty sure because I've finished that quiz or test already
water falls off a cliff of height 20m at a rate of 50kg per second
calculate the mass of water that falls in 1 minute
calculate the gravitational potential energy lost by the water in 1 minute
Answer:
M = 50 kg / sec * 60 sec = 3000 kg water that falls
PE = M g h initial potential energy of water
PE = 3000 kg * 9.8 m/s^2 * 20 m = 588,000 joules of energy lost
Objects in space are moving at a constant velocity in a straight line.
Which phrase tells what they do?
O always move in an orbit
O stop on their own when they run out of energy
o keep moving at a constant velocity until some force acts on them
O require constant energy to keep moving in one or more directions
Answer:
C
Explanation:
An object in motion will stay in motion unless acted on by a net positive or negative force.
For answer A. If the object were to be in an orbit, it would inevitably accelerate due to it being acted on by the gravitational force from the object it is orbiting. At different points in the orbit, the object will move at different speeds and continuously transfer between kinetic and potential energy.
For answer B. The object would would not stop their motion. In order for the object to lose energy, it would have to transfer it through friction or through its interaction with a gravitational field.
For answer D. No energy is "required" to maintain constant motion unless the object is willingly fighting against a resistive force like friction or a graviational well.
A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a horizontal plane, as shown above. A student wishes to determine the frictional torque exerted on the platform by the axle as the platform rotates. The student has access to equipment that would usually be found in a school physics laborator
The frictional torque exerted on the platform by the axle as the platform rotates will be;
[tex]\rm T_f \theta =\frac{1}{2} I [\omega^2-\omega_0^2][/tex]
What is torque?Torque is the force's twisting action about the axis of rotation. Torque is the term used to describe the instant of force. It is the rotational equivalent of force. Torque is a force that acts in a turn or twist.
The amount of torque is equal to force multiplied by the perpendicular distance between the point of application of force and the axis of rotation.
Work done by the frictional torque = Change in the rotational kinetic energy of the wheel
[tex]\rm T_f \theta =\frac{1}{2} I [\omega^2-\omega_0^2][/tex]
Where,
[tex]\rm T_f[/tex] is the frictional torque
[tex]\rm \omega[/tex] is the final angular velocity
[tex]\rm \omega_0[/tex] is the initial angular velocity
[tex]\rm \theta[/tex] is the angular displacement
Hence, the frictional torque exerted on the platform by the axle as the platform rotates will be;
[tex]\rm T_f \theta =\frac{1}{2} I [\omega^2-\omega_0^2][/tex]
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13. What happens to the number of times you must rotate a screw in order to drive it into
an object when you increase the number of threads on the screw?
a. You must rotate the screw more times and apply a stronger force
b. You must rotate the screw more times but can apply a smaller force
c. You will rotate the screw less times but must apply a stronger force
d. You will rotate the screw less times and can apply a smaller force
14. What do you
hvor
Answer:
B
Explanation:
What is the voltage of the following circuit?
Answer:
v = 48
Explanation:
follow the formula v = i x r add up all the resistors an multiply it by the current
Saturn is moving with uniform angular speed of 2πf along the circumference of it's orbit around the sun with radius R, having centre O. At any time, the angular position of Saturn is (2πf)t and the displacement in SHM at that time t is given by x(t)=Rcos(2πf)t. Find it's acceleration.
Answer:Sir haymo knows
Explanation:
he gave as homework
The acceleration of the Saturn is - (2πf)²x(t).
What is Simple harmonic motion?A motion in which the restoring force is directly proportional to the body's displacement from its mean position is known as a simple harmonic motion, or SHM. This restoring force always moves in the direction of the mean position. A particle moving in simple harmonic motion accelerates as a(t) = - ω² x (t). Here, ω denotes the particle's angular velocity.
The acceleration of the particle at any position is directly proportional to the displacement from the mean position in simple harmonic motion, which is an oscillatory motion.
Given that:
at any time, the angular position of Saturn is (2πf)t.
the displacement in SHM at that time t is given by x(t)=R cos(2πf)t.
Hence, speed in SHM at that time t is given by
[tex]v(t) = \frac{dx(t)}{dt} =R \frac{d }{dt} cos(2\pi f)t = -(2\pi f) sin(2\pi f)t[/tex]
it's acceleration is
[tex]a(t) = \frac{dv(t)}{dt} =-(2\pi f) R \frac{d }{dt} sin(2\pi f)t = -(2\pi f)^2 Rcos(2\pi f)t = -(2\pi f)^2 x(t)[/tex]
hence, at any time t, the acceleration of the Saturn is - (2πf)²x(t).
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MARKING BRAINLIEST
What is the zeroth law of black hole thermodynamics?
The zeroth law states that a simple, non-rotating black hole has uniform gravity at its event horizon. This is kind of like saying that such a black hole is at thermal equlibrium.
hope it helps...!!!
Answer ASAP and only if you know its correct
this is science btw
Answer:
jupiter
Explanation:
from the list, Jupiter is closest to the sun.
Answer ASAP and only if you know its correct
this is science btw also, brainliest to the correct answer
Answer:
the answer is B
Explanation:
its b
Scientists such as Heinrich Hertz, Philipp Lenard, Max Planck, and Albert Einstein made scientific contributions that ultimately demonstrated that light is electromagnetic radiation, and that it has a “dual nature.” Some electromagnetic phenomena are best explained with a particle model, and some with a wave model. In a sense, “wave” and “particle” are just easy mental models for light. We employ them because we are used to seeing waves and particles—such as those in water waves and baseballs—in our daily lives. Electromagnetic radiation is a basic concept in physics, but it doesn’t fit completely into one of these neat little boxes.
Research and discuss at least one modern technology that employs electromagnetic radiation and that can be explained by the wave model, the particle model, or a combination of the two. Some possible technologies include solar panels, burglar alarms, cameras, and cell phones.
A common application of the wave/particle duality of ligt is in the technology of the solar panel.
Photoelectric effectOne of the greatest breakthroughs of mordern physics is the establishment of the fact that light could both behave as a light and a particle. The ressearch into the particle nature of light gave rise to the phenomenon of the photoelectric effect.
Now, a very popular application of this is in the solar panel where light impinges on a metal panel which is connected to a battery that can be used to store charges.
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Jeff's body contains about 5.12 L of blood that has a density of 1060 kg/m3. Approximately 45.0% (by mass) of the blood is cells and the rest is plasma. The density of blood cells is approximately 1125 kg/m3, and about 1% of the cells are white blood cells, the rest being red blood cells. The red blood cells are about 7.50m across (modeled as spheres).
What is the mass blood of the blood in Jeff's body?
blood=
Approximately how many blood cells (of both types) are in Jeff's blood?
Answer:Answer:
a) The mass of the blood is 5.788 kg
b) The total cells is 1.041x10¹³cells
Explanation:
Given:
V = volume of blood = 5.46 L = 0.00546 m³
ρ = density of blood = 1060 kg/m³
a) The mass of the blood is equal:
b) mc = mass of cells = 45% of mass of blood
mc = 0.45 * 5.788 = 2.6046 kg
ρc = density of cells = 1125kg/m³
The volume of the cells:
Vwc = volume of white blood cells = 1% of volume of the cells
Vwc = 0.01 * 0.0023 = 2.3x10⁻⁵m³
The radius of the cell is:
The volume of a single cell is:
The number of the red blood cells is:
The number of the white blood cells is:
The total cells is:
Tc = 1.031x10¹³ + 1.041x10¹¹ = 1.041x10¹³cells
Explanation: I just copied from another answer
what is the time right now and why.
Answer:
Its 11:21 AM where i am
Explanation:
I d k cuz the sun is up? XD i d k
a ballon holds 24L at 45 k . find the volume if the temperature is increased to 911 k
The speed of light is 300,000,000 m/s, what is the frequency of an x-ray that has a wavelength of .1 m? ____Hz?
Answer:
Explanation:
The speed of light is 300,000,000 m/s. Shat is the frequency of microwaves with a wavelength of 0.01 meter
a. The flow of energy from Earth's interior to the surface is about 50 terawatt (1 terawatt = 1e12 joule/sec). This is the energy that gives Earth an active surface geology (hot springs, volcanoes, plate tectonics, etc). Roughly half of this geothermal is from the energy produced by radioactive decay, and roughly half is from the energy left from the formation of the hot Earth.
Estimate how much geothermal energy reaches Earth’s surface in one day (in Joule).
b. Estimate humanity’s current consumption of energy in one day (in Joule).
c.Assuming 100% efficiency of extracting geothermal energy, estimate the ratio of geothermal energy to human's current annual world consumption of energy.
A) The amount of geothermal energy that reaches Earth's surface in one day is : 43.2 * 10¹⁷ joules
B) Humanity's current consumption of energy is; 71.4 GJ per individual.
C) Ratiois ; 60.5 * 10⁶ Joules
Given data :
Amount of energy flow = 50 terawatt = 50*10¹² joule/sec.
Determine the geothermal energy that reaches the earthSince the geothermal energy reaches the earth in a single day
Energy = power * time
Time = 24 hours ( 1 day ) = 86400 secs.
Energy = 50*10¹² joule/sec * 86400 secs
= 43.2 * 10¹⁷ joules
B) Estimating humanity's current consumption of energy in one day.Humanity's current consumption of energy in one day is estimated to be 71.4 GJ per individual.
C) Determine the ratio of geothermal energy to human's current annual consumptionGeothermal energy / human current annual consumption
= 43.2 * 10¹⁷ Joules / 71.4 * 10⁹ Jolues
= 60.5 * 10⁶ Joules
Hence we can conclude that A) The amount of geothermal energy that reaches Earth's surface in one day is : 43.2 * 10¹⁷ joules
B) Humanity's current consumption of energy is; 71.4 GJ per individual.
C) Ratiois ; 60.5 * 10⁶ Joules
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2. Anna mixes 200 g of hot coffee at 90 °C with 50 g of cold water at 3 °C to bring down the temperature of the coffee. Explain what happens to the mixture using kinetic molecular model. (3 marks)
The average kinetic energy of the molecules of the coffee will decrease and the speed of the individual molecules will also reduce.
Temperature of resultant mixtureThe temperature of the resultant mixture will be higher than the cold water temperature and lower than the hot coffee temperature.
Based on the decrease of the resulting temperature (equilibrium temperature) of the mixture, the average kinetic energy of the molecules of the coffee will decrease and the speed of the individual molecules of the hot coffee mixture will reduce, leading to a resultant cold mixture of coffee.
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Help me balance ittt
Answer:
CH4 + 2O2 -> CO2+2H20 Here we add 2 in front of H2O and 2 in front of O2
What happens to light when it enters a lens?
Question 9 options:
It speeds up.
It is reflected.
It is refracted.
It becomes brighter.
Answer:
It is refracted.
Explanation:
Answer:
It is refracted
Explanation:
The light changes direction when it enters and exits the prism. When white light is shone through a triangular prism, a rainbow of light is seen on the opposite side of the prism.
A scientist thinks that a certain chemical is a mutagen. She exposes plant cells to a large amount of this chemical in the laboratory.
Which statement best provides evidence that the substance is a mutagen?
1
Lighting a match results in light and heat. Since energy was not created by the match, what transformation took place?
A.
Friction generated heat to release chemical energy.
B.
Light energy was generated from radiant energy.
C.
Sound energy generated heat energy.
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Unit 7 - Post Test
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Answer:
The answer is A.
Explanation:
The friction generated heat to release chemical energy because the same same thing happens with fluorescent and sodium vapor lamps; heat causes the (low-pressure) mercury/sodium vapor gas lamp to cause a lot of heat energy resulting in the same thing happening when you strike a match.
B. A 20kg wagon is pulled up a 30° incline at an acceleration of 2.5ms?. The force pulling the wagon is parallel to the incline and its value is 182N. Determine the value of the co-efficient of kinetic friction. [5]
The value of the coefficient of kinetic friction between the wagon and inclined surface is 0.78.
Coefficient of the kinetic frictionThe value of coefficient of kinetic friction is calculated as follows;
F - Ff = ma
F - μmgcosθ = ma
where;
F is applied forceμ is coefficient of kinetic frictionm is mass of the wagona is acceleration of the wagon182 - μ(20 x 9.8 x cos30) = 20(2.5)
182 - 169.74μ = 50
182 - 50 = 169.74μ
132 = 169.74μ
μ = 132/169.74
μ = 0.78
Thus, the value of the coefficient of kinetic friction between the wagon and inclined surface is 0.78.
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A 43 kg rock is dropped from a 36 tower. How long does it take the rock to fall to the ground?
A 43-kg rock is dropped from a 36 m, experiencing a Uniformly Accelerated Motion and falling to the ground 2.7 s later.
What is a Uniformly Accelerated Motion?A Uniformly Accelerated Motion is a motion in which the acceleration of the object is constant.
A 43 kg rock is dropped from a 36 m tower. Given the only acceleration is that of gravity, we can calculate the time required to hit the ground using the following kinematic equation.
s = 1/2 × a × t²
t = √(2s / a)
t = √[2 × 36 m / (9.8 m/s²)] = 2.7 s
where,
s is the displacement.a is the acceleration.t is the time.A 43-kg rock is dropped from a 36 m, experiencing a Uniformly Accelerated Motion and falling to the ground 2.7 s later.
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MARKING BRAINLIEST
Who discovered the four laws of black hole mechanics?
Explanation:
Jacob Bekenstein, Brandon Carter, and James Bardeen(few new stuff were done by Stephen hawking)
4. What type of assessments are based on repeatable, measurable data?
Objective assessment is the type which is based on repeatable, measurable data.
What is Objective assessment?This involves the use of unbiased and balanced observation based on verified facts.
This is verified by the use of repeatable and measurable data so as to ensure the accuracy is high in this scenario.
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what kingdom are true bacteria in
Answer: Kingdom Monera
A current-carrying gold wire has diameter 0.88 mm. The electric field in the wire is0.55 V/m. (Assume the resistivity ofgold is 2.44 10-8 Ω · m.)
(a) What is the current carried by thewire?
1 A
(b) What is the potential difference between two points in the wire6.3 m apart?
2 V
(c) What is the resistance of a 6.3 mlength of the same wire?
3 Ω
Hi there!
a)
We know that the resistance of the wire is equivalent to:
[tex]R = \frac{\rho L}{A}[/tex]
R = Resistance (Ω)
ρ = Resistivity (Ωm)
L = Length (m)
A = Cross-sectional area (m²)
We can relate the voltage to an electric field by:
[tex]V = Ed \\\\V = El[/tex]
V = Potential Difference (V)
E = Electric Field (V/m)
l = Length of wire (m)
And Ohm's Law:
[tex]V =iR[/tex]
i = Current (A)
V = Potential Difference (V)
R = Resistance (Ω)
We do not know the length, so we can solve using the above relationships.
[tex]V = iR\\\\V = i\frac{\rho L}{A}\\\\\frac{V}{L} = E = i\frac{\rho}{A}\\\\i = \frac{EA}{\rho} = \frac{.55 \times \pi (0.00044^2)}{(2.44 \times 10^{-8})}} = \boxed{13.71 A}[/tex]
b)
We know that V = Ed (Electric field × distance), so:
[tex]V = 0.55 \times 6.3 = \boxed{3.465 V}[/tex]
c)
Calculate the resistance using the above equation.
[tex]R = \frac{\rho L}{A}\\\\R = \frac{(2.44\times 10^{-8})(6.3)}{\pi(0.044^2)} = \boxed{2.527 \times 10^{-5} \Omega}[/tex]
Two boats - Boat A and Boat B - are anchored a
distance of 4.1 meters apart. The incoming water
waves force the boats to oscillate up and down,
making five complete cycles every 26.1 seconds.
When Boat A is at its peak, Boat B is at its low point.
There are never any waves between the two boats.
The vertical distance between Boat A and Boat B at
their extreme is 6.9 meters. Determine the wavelength
(in meters), frequency (in Hertz), and speed (in
meters/second) of the wave. (HINT: begin with a
diagram.)
Answer:
the wave length is 7.6 inches
Explanation:
List two similarities between combustion and fission
Answer:
Explanation:
Bot produce heat both produce end products that are different than the beginning products