Answer:
Critical angle
Explanation:
The angle of incidence when the refracted angle is 90°; we have the critical angle at this point. At this point, the refracted ray lies between the boundary between the two medium, this is the angle just before total internal reflection occurs, as the refracted angle exceeds 90°, all rays are reflected. Hence, we can conclude that it is the largest angle at which reflection can still occur.
Which object would most like absorb sound?
Answer:
a blanket
Explanation:
soft materials absorb sounds meanwhile hard materials just reflect them causing an echo
HELP NOWWWWW PLEASE
Which of the following materials is most efficient at transferring vibrations?
a) water
b) air
c) pillow
d) steel rod
Answer:it is A
Explanation:
ok
What is the weight of an object that has a mass of 12 kg if it is on Earth, where the acceleration due to gravity (g) is 9.8 m/s/s ? (units would be “Newtons” of force)
Please help ASAP
Answer:
Weight is ambiguous; depending on which meaning you use, either 12 kg or 117.7 N. Since you haven’t mentioned any other forces and assuming it is on earth, the force of gravity acting on 12 kg is about 117.7 N. That is one meaning of weight, the other (in law and commerce) is the mass.
Oh, in Customary, about 26.5 lb (mass) or 26.5 lbf (gravity).
See, weight = mass × acceleration due to gravity.
From the ques, we already have mass(12 kg) and acceleration(9.8 m/s²)
It's pretty simple now,
w = mg
w = 12 × 9.8
w = 117.6 N
Plz someone help me Asap
Answer:
all I know is C
are there more questions? anyone?
-KARL IS STOOPID
Explanation:
The energy diagram shows the changes in energy during a chemical reaction.
Which statement best describes the total energy change of the system?
Potential energy
n
Reaction progress
O A. Energy is released, and the products have higher potential energy,
O B. Energy is absorbed, and the reactants have higher potential
energy
O C. Energy is released, and the reactants have higher potential energy.
O D. Energy is absorbed, and the products have higher potential energy.
Statement B best describes the total energy change of the system. Energy is absorbed, and the reactants have higher potential energy.
What is a chemical reaction?One or more compounds, known as reactants, are transformed into one or more distinct substances, known as products. Such a process is known as a chemical reaction.
The energy diagram depicts how energy fluctuates during a chemical process.
The statement that best characterizes the overall energy change of the system is, "energy is absorbed, and the reactants have greater potential energy".
Hence, statement B best describes the total energy change of the system.
To learn more about the chemical reaction refer to the link;
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Answer: Energy is RELEASED and the REACTANTS have HIGHER potential energy.
Explanation: I took the test
What is the reciprocal of X/1
Answer:
Explanation:
the answer is there, is in the graph
A bullet is fired at 660 ms and strikes a target 200 m away. How long has it
taken to hit the target?
Calculate the mass of a bus if it produces a force of 14,000 N while accelerating
at a rate of 5 ms 2 ?
You toss a ball at 30 ms' straight upward. How much time will the ball take
to reach the top of its path?
35
Answer:
Explanation:
The first question utilizes the one-dimensional equation
Δx = [tex]v_0t+\frac{1}{2}at^2[/tex] where Δx is the displacement of the bullet, v₀ is te initial velocity with which the bullet was fired, a is the acceleration in the horizontal dimension (which is always 0!), and t is the time in seconds. That's our unknown here. Filling in:
[tex]200.0=660t+\frac{1}{2}(0)t^2[/tex] and
200.0 = 660t so
t = .30 seconds
The second question is a simple application of Newton's 2nd Law which says force = mass times acceleration:
14000 = m(5.0) so
2800 kg = m
The third question is a bit more interesting. We will use the one-dimensional equation
[tex]v=v_0+at[/tex] where v is the final velocity of the ball (which is always 0 at the top of its projectile path!), v₀ is the initial velocity of the ball, a is the pull of gravity on the ball, and t is the time it takes to do this. Filling in:
0 = 30 + (-9.8)t and
-30 = -9.8t so
t = 3.1 seconds
A scientist recorded the number of geese found in a park on various days of the week. The data are shown below. 22, 25, 29, 21, 33, 28, 28 What is the range of these data? O A. 33 O B. 7 O C. 21 O D. 12
Answer: it's 12
Explanation:
Range is the difference between the highest and lowest numbers.
33-21=12
If a machin
has a mechanical advantage of 4, and an ideal mechanical advantage of 5. What is the
efficiency of the machine?
Answer:
Efficiency = 80%
Explanation:
Given the following data;
Mechanical advantage (MA) = 4
Ideal mechanical advantage (IMA) = 5
To find the efficiency of the machine;
Mathematically, the efficiency of a machine is given by the formula;
[tex] Efficiency = \frac {MA}{IMA} * 100 [/tex]
Substituting into the formula, we have;
[tex] Efficiency = \frac {4}{5} * 100 [/tex]
[tex] Efficiency = 0.8 * 100 [/tex]
Efficiency = 80%
.
Evidence obtained by simply copying files changes the date stamp. These files are not allowed to be used as admissible evidence
True or false
Answer:False
Explanation:
Which identification and treatment model takes family environment into account for diagnosis and treatment?
If this question is the essay one the answer would be " The biopsychosocial model is the distinguishing proof and treatment model that considers family climate for conclusion and treatment. It takes a gander at both clinical and mental reasons for problems, and treats mental issues as cooperation of natural, mental, and sociocultural components. Family climate is considered as one of these sociocultural elements."
Fill in the blanks! Please, help me ASAP
I’ll give extra points
Answer:
Please find attached the required filled diagram created with MS Visio
Explanation:
Waves → Are produced by → Vibrating molecules → Which pass energy to → neighboring molecules
Waves → Are → Repeating disturbances → That transfers → Energy → Through → Matter or Space
Waves → that need a → Medium → are called → Mechanical → And can be either → Compressional → Or → Transverse
A metal ball rolls from rest at Point A down the track to Point E as shown below.
At which point in the picture above is the velocity at its greatest?
Answer:
Explanation:
Velocity is at its greatest when kinetic energy is at its max which is when all the ball's energy has been transformed from potential energy to kinetic energy which is at the lowest point in its travels (assuming the ball is rolling down a ramp). You have no picture here so this answer is a general one, not a specific one.
Elements in the same group have…
A. A wide range of chemical properties
B. The same atomic radius
C. Number of electrons in its outer shell.
D. Same number of protons
E. The same number of electron shells.
Part D
From this data, how many male, female, adult, and baby mountain goats do you predict are in the park?
Answer:
80
Explanation:
I literally just did this question lol I hope I helped
In an ecosystem having a park, from the given data there are 71 male,93 female, 103 adults and 61 baby goats in the park.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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A mechanical machine requires 210 J of work to do 115 J of work in lifting a crate. What is the efficiency of the machine?
Answer:
efficiency is equal to work output over work input times 100 ÷ so the answer for this question is 54.7 percent
A pair of oppositely charged plates is separated by 0.09 m. A potential difference of
285 V exists between the plates. What is the electric field that exists between the plates?
Answer:
25.65 V/m
Explanation:
Applying,
V = Er................. Equation 1
Where V = Electric potential, E = electric field, r = distance of seperation.
make E the subject of the equation
E = V/r.............. Equation 2
From the question,
Given: V = 285 V, r = 0.09 m
Substitute these values into equation 2
E = (285×0.09)
E = 25.65 V/m
Hence the electric field between the plates is 25.65 V/m
How are the lenses of 3-D glasses polarized?
Both lenses are polarized horizontally.
Both lenses are polarized vertically.
They are not polarized.
One lens is polarized horizontally, and one is polarized vertically.
Answer:
I think the last one which one lens is polarized horizontally, and one is polarized vertically
What is the difference between the chemical bonds formed in molecules of
N2 and the chemical bonds formed in crystals of Mgo?
A. MgO is a covalent substance, and N2 is an ionic substance.
B. Both N2 and MgO are covalent substances, but the bonding
electrons in MgO are shared more equally between atoms than
they are in N2
C. Both N2 and MgO are covalent substances, but the bonding
electrons in N2 are shared more equally between atoms than they
are in Mgo.
D. Mgo is an ionic substance, and N2 is a covalent substance.
Answer:
D
Explanation:
Mgo is ionic and N2 has covalent bonds
Which statement accurately describes how the velocity of an object in free
fall changes?
A. The velocity increases at first, and then it stays constant.
B. The velocity stays constant during the entire fall.
C. The velocity steadily increases throughout the fall.
D. The velocity increases at a faster rate the closer the object gets to
the ground.
Answer:
A
Explanation:
An object reaches top velocity for its mass, then it falls at that same speed until a force acts on it
O aparelho de som do carro de João dissipa uma potência de 150W quando ligado em volume máximo. Sabendo que a bateria de seu carro fornece uma diferença de potencial de 12V, calcule a corrente máxima nesse circuito, quando esse aparelho está ligado em volume máximo e a resistência elétrica.
Answer:
i not sure
Explanation:
Determine the mechanical advantage of a car jack that uses an input force of 30 N and provides an output force of 600 N. pls answer quick
Answer:
Mechanical Advantage of car jack is 20
Jeremy is pushing his two children on a set of swings. He gives his daughter a push and she swings
Jeremy gives his son the same push, but he only swings about two feet high. What could account f
the kids got?
Jeremy's daughter has more mass, so it takes less force to get her into the air.
Jeremy's son has more mass, so it would take more force to reach the same height as his da
O
Jeremy's son has less mass, so it would take more force to reach the same height as his da
O
Jeremy's daughter has more mass, so she accelerates faster than his son.
what is the density to the nearest hundredths, of a metal with a volume of 3.00 cm3 and a mass of 8.13g?
badly need help with this question....
Answer:
When there's no external force, the total momentum of system remains the same before and after collision
Less than the kinetic energy of the system before the collision
Explanation:
Definition of conservation of momentum
: the total linear momentum of a system of particles not acted upon by external forces is constant in magnitude and direction irrespective of any reactions among the parts of the system
Definition of inelastic collision:An inelastic collision is a collision in which there is a loss of kinetic energy.
Brainliest please
What is the y component of a vector defined as 12.2m at 81.5°?
12.1m
1.80m
-1.80m
-12.1m
Answer:
Explanation:
This is a displacement vector since it is defined in terms of distance (meters, to be exact). The way you find the y-component is
[tex]V_y=Vsin\theta[/tex] which says that you multiply the magnitude of the vector (its length) by the sin of the direction (the angle):
[tex]V_y=12.2sin(81.5)[/tex] and get
[tex]V_y=[/tex]12.1 m
[tex]give \: some \: example \: of \: non - contact \: force \: [/tex]
what happens to the piece of plastic?
Answer:
it reheated and use form another
How fast is lightening
Answer:
According to online, it shows that lightning can be traveling at 186,000 miles in only one second!
Hope it was helpful
What is the force weight of a jaguar who jumps 3 meters to a tree branch with 2670 J of work?
Answer:
[tex]we \: know \: energy \: = \: force \: \times distance \\ e = f \times d \\ so \: f \: = \frac{e}{d} \\ so \: th \: force \: here \: = (\frac{2670}{3}) newton \\ = 890newton[/tex]
Hope it helps