Answer:
A hypothesis is a possible explanation for a set of observations or an answer to a scientific question. A hypothesis must be testable and measurable.
Explanation:
Answer:
hypothesis is likely tobe the answer, im indian
The air is 80% Nitrogen, in what form do organisms use nitrogen?
Answer:
Nitrogen in the air
Explanation:
The Earth's atmosphere contains almost 80 % nitrogen gas. It cannot be used in this form by most living organisms until it has been fixed, that is reduced (combined with hydrogen), to ammonia.
Select all that apply.
The spectrum of Star S is compared to a reference hydrogen spectrum. What can be concluded about Star S?
Star S is moving away from Earth.
Star S is moving toward Earth.
Star S has transverse motion.
Star S has radial motion.
Answer:
Star S has radial motion
Explanation:
Because the radial motion stracture is kinda similar to hydrogen spectrum(I'm guessing,only lol)
The spectrum of Star S is compared to a reference hydrogen spectrum. It is concluded that Star S has transverse motion.
What is hydrogen spectrum?Hydrogen spectrum is used to show the quantized electronic structure of an atom.
If Star S is not showing radial motion. So, it is not moving away or towards the Earth.
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Encontrar la distancia y desplazamiento de las dos trayectorias si se mueve el móvil Desde A hasta B
Answer:
Build Your Confidence
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Explanation:
Which city has the lowest temperature and slowest speed of sound?
a. Baguio
b. Manila
c. Lipa
d. Cagayan
e. Cebu
f. Tagaytay
ITS A a AAA A A a A A A A A A A
fraction that occurs in gases and liquids is called what
plzz help meeeee
Answer:
it is called fluid friction.
Pls answer it ASAP I need it today
Activity 6: Write the uses of each cleaning compound.
1. Detergent-
2. Solvent cleaners-
3. Avid cleaners-
4. Abrasives-
Answer this question i will mark you brainliest
Answer:
all of the above OR LETTER B
Explanation:
THAT'S WHAT I KNOW:))
Answer:
la c)
Explanation:
HELP!
Electronic signals can travel very long distances in _______ fibers, due to total internal reflection.
optical fibre
[tex] \huge \mathfrak \blue{hope \: it \: helps}[/tex]
in longitudinal waves in a spring, the parts where the coils are close together are called
Answer:
compression
Explanation:
compression
which type of wave has rarefactions and compressions
Help asap please thank you
in figure Car’s weight = 16,000 N. What is the external input force?
The answer is 200 Newton
Answer:
The answer is 200 Newtok
A 70 kg child escapes from a burning building by walking off a roof 30 m above a catching net. Assuming that resistance is a constant 90 N on the child during their fall, calculate the person's velocity just before hitting the net.
Newton's second law and kinematics allow to find the result for the velocity at the point of reaching the child's net is:
v = 23.7 m / s
Newton's second law states that the net force is proportional to the mass and acceleration of the body.
∑ F = m a
Where F is the force, m the mass and the acceleration of the body.
In the attachment we can see a free body diagram of the system, where the positive direction is up.
F -W = m a
Weight is
W = m g
[tex]a = \frac{F}{m} - g[/tex]
Let's calculate
[tex]a= \frac{30}{70} - 9.8[/tex]
a = -9.37 m / s²
Negative indicates downward direction.
Kinematics studies the movement of the body, let's look for speed.
v² = v₀² - 2 a (y-y₀)
Where v is the speed, v₀ is the initial speed, a tha acceleration ang (y-y₀) is the eight.
As the child is released, his initial velocity is zero, upon reaching the floor his height is zero and his initial height is I = 30 m.
[tex]v= \sqrt{2 a y_o}[/tex]
Let's calculate
v = [tex]\sqrt{2 \ 9.37 \ 30}[/tex]
v = 23.7 m / s
In conclusion using Newton's second law and kinematics we can find the velocity at the point where the child reaches the net is:
v = 23.7 m / s
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The velocity of the child before hitting the ground is 22.596 m/s.
The given parameters;
mass of the child, m = 70 kgheight of the roof, h = 30 mair resistance on the child, F = 90 NThe weight of the child acting downwards is calculated as follows;
W = mg
W = 70 x 9.8
W = 686 N
The net force on the child is calculated as follows;
∑Fₙ = 686 N - 90 N
∑Fₙ = 596 N
The acceleration of the child is calculated as follows;
F = ma
[tex]a = \frac{F}{m} \\\\a = \frac{596}{70} \\\\a = 8.51 \ m/s^2[/tex]
The velocity of the child before hitting the ground is calculated as;
v² = u² + 2as
v² = 0 + (2 x 8.51 x 30)
v² = 510.6
v = √510.6
v = 22.596 m/s
Thus, the velocity of the child before hitting the ground is 22.596 m/s.
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Which describes a phase change? (Select all that apply.)
Energy is released or absorbed.
The process is reversible.
The process moves atoms into permanent places.
The compounds transform protons into neutrons.
Answer:
Energy is released or absorbed
The process is reversible
Phase change can be described as:
Energy is released or absorbed.The process is reversible.What is phase change?The physical process of changing a medium's state from one to another is known as a phase transition (or phase change) in the domains of chemistry, thermodynamics, and other related sciences.
The phrase is frequently used to describe transitions between the three fundamental states of matter—solid, liquid, and gas—and, in rare instances, plasma.
The physical characteristics of a phase of a thermodynamic system and the states of matter are constant. Certain properties of a given medium change during a phase transition as a result of a change in the environment, such as temperature or pressure. This change can be discontinuous.
Hence, Phase change can be described as:
Energy is released or absorbed and the process is reversible.
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Which 2 points are unbalanced??
Answer: section 2 and 4
Explanation:
I had this problem before and that was the answer.
what process is a form of mechanical weathering ?
Answer: abrasion-is the physical process by which rocks and clasts are reduced in size
Explanation: but i didn't see any answer chooses
what is deltoids muscle?
Answer:
The deltoid muscle is a large triangular shaped muscle associated with the human shoulder girdle, explicitly located in the proximal upper extremity.
Explanation:
A mango fruit drop from a branch 10m above the ground. Just before hitting the ground the velocity is ?
Answer:
Below
Explanation:
Here are all the values we are given :
dy = 10m
We know that :
a = 9.8 m/s^2 because it is a free falling object
vi = 0 m/s
Here is the formula to find the final velocity :
vf^2 = vi^2 + 2ad
vf^2 = (0)^2 + 2(9.8)(10)
vf^2 = 196
vf = 14 m/s
Therefore the mango's velocity before hitting the ground is 14 m/s
Hope this helps!
need an answer asap
if u know physics pls answer the rest of my question!!
i will give brainliest
a] negative charge it's e-
A box is being pushed at constant speed up an inclined
Answer:
ok what is the question
Explanation:
I don't know what the question is
Sound wave is an example of ……………………………………. wave.
1.Energy
2.Medium
3.Transverse
4.Longitudinal
Answer:
4
Explanation:
longitudinal
have a beautiful day ahead
What is the physical dimension for moment
what piece of equipment on a boat is most important in preventing propeller
Explain the Kinetic Theory of Matter
and use an example from everyday life
Answer:
The Kinetic Theory of Matter or KTM as i will call it, states that every object is made of many many small particles (humans are made of sextillions of atoms), and that they are constantly moving and bumping each other. The degree to which the particles move is determined by the amount of energy they have and their relationship to other particles.
An example would be Brownian Motion- the random movement of dust particles because of collisions with "air" molecules and how gases behave i.e. Boyle's, Charles', and Gay-Lussac's Laws.
Describe all the ways that Newton’s Laws can apply in the game of football?
Answer:
Newton's Second Law of Motion states that a force on an object is equal to the mass of the object multiplied by its acceleration (F=ma). ... When the punter kicks the ball, his foot exerts a force on the ball. The football then exerts an equal amount of force in the opposite direction on the kicker's foot.
In football, the foot of a kicker applies force to the ball when he kicks it, as the force acting on a ball is equal to that ball's mass times its acceleration, so Newton's second law is applied here.
What is Newton's Second Law?The precise explanation of how a force can change a body's motion is given by Newton's second law. A body's momentum is said to vary at a rate equal to the force acting on it over time, both in magnitude and direction. A body's momentum is determined by its mass and velocity together.
According to Newton's Second Law of Motion, a force acting on an object is equal to that object's mass times its acceleration (F=ma). The punter's foot applies force to the ball when he kicks it. The kicker's foot is then subjected to an equivalent force from the football acting in the opposite direction.
Therefore, In football, the foot applies force to the ball when he kicks it, so Newton's second law is applied here.
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which type of energy does a ball falling through the air have?
Answer:
the answer would be kinetic energy
Calculate the pressure increase at the bottom of a pool of depth 2m. Density of water=1000kg/m^3 g=10N/kg
Quinn accelerates her skateboard along a straight path from 0 m/s to 4.0 m/s
in 2.5 seconds. Calculate the acceleration of the skateboard
[tex]\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{4-0}{2.5}[/tex]
[tex]\\ \sf\longmapsto Acceleration=\dfrac{4}{2.5}[/tex]
[tex]\\ \sf\longmapsto Acceleration=1.6m/s^2[/tex]
A cup of tea with a temp. of 80°C is put on a table in a 20°C room. What happens to thermal energy and molecular motion of the tea when it is left on the table? *
Answer:
The thermal energy increases and the molecules move faster.
A battery-powered lawn mower has a mass of 48.0 kg. If the net external force on
the lawn mower, including both your push and any resistance, is 40.5 N, then what
is the mower's acceleration?
The lawnmower's acceleration is 0.844 meters/sec².
Given to us:
Mass of the lawnmower, m = 48.0 kgs. ,
Net external force, F = 40.5 N,
As we know, a force can change the motion of an object. A force causes an object with mass to change its velocity.
Therefore, when we calculate force, we take force as a net force.
[tex]\bold{ Force= Mass\times (change\ in\ velocity)=Mass\times acceleration}[/tex]
[tex]F = m\times a\\40.5 = 48 \times a\\\\a= \dfrac{40.5}{48} \\\\a= 0.844\ m/sec^2[/tex]
Hence, the lawnmower's acceleration is 0.844 meters/sec².
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