Which of these is MOST LIKELY to cause natural pollution?
Answer:
volcano
Explanation:
the ash and stuff pollutes the air
An electron with a kinetic energy of 3.90 ev collides with a sodium atom.
Which of the following best describes alternating current? current that increases and decreases in temperature current that constantly turns on and off current in which charges change direction current that gains and loses electrons
Answer: Charge that jiggles back and forth very quickly.
Explanation: Alternating current is an electric current that peroidically reverses direction .
A P E X
The following best describes alternating current, Charge that jiggles back and forth very quickly.
What increases or decreases alternating current?A transformer is a machine that either boosts or reduce the voltage of alternating current.
Step-up transformer rises the voltage of alternating current whereas step-down transformer reduces the voltage of alternating current.
Thus, Alternating current is an electric current that peroidically reverses direction.
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What aspects of bone’s structure make it stronger than concrete? think about the engineering design of bone. use the terms tensile strength and compressional strength in your answer?
Bone's structure is optimized for strength due to its complex arrangement of organic and inorganic materials.
Tensile strength is a key factor: collagen fibres in bone resist pulling forces, making it flexible yet tough.
Compressional strength is achieved through the dense arrangement of mineralized hydroxyapatite crystals, providing resistance against crushing loads.
This combination of tensile and compressional strength allows bone to withstand bending, twisting, and impact. In contrast, concrete primarily relies on compressional strength, making it brittle and prone to fracture under tension.
Bone's intricate structure, with collagen providing flexibility and hydroxyapatite providing rigidity, makes it significantly stronger and more resilient than concrete in various mechanical scenarios.
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Bones have a higher tensile and compressional strength than concrete due to their composite structure of collagen fibers and mineralized matrix, along with a complex microarchitecture designed to adapt to mechanical stresses. These aspects make bones robust and efficient weight-bearing structures.
The aspects of bone's structure that make it stronger than concrete are related to its complex microarchitecture and composite nature, which enable it to have a high tensile strength and compressional strength. Bones are formed from collagen, much like the steel rebar in concrete, and a mineralized matrix rich in calcium, which bears similarity to the concrete itself. However, the collagen provides flexibility and tensile strength, while the inorganic salts provide compressional strength, making bones robust and capable of adapting to mechanical stresses.
The ultimate strength of human bones, particularly in the femur, is impressive, with an ultimate compressive strength of 205 MPa and an ultimate tensile strength of 135 MPa. This strength is a result of bones being weight-bearing structures, designed to carry loads much like the columns in a building or fibrous structures like trees. The engineering design of bones takes into account different stresses on different parts of the body, which is why the structure of the femur can vary from thin sheets separated by marrow to cylindrical shapes filled with or without marrow.
The elastic modulus of bone also varies based on whether it is under tension or compression, highlighting the bone's capability to withstand different directional forces. Such properties make bones incredibly efficient at carrying weight and resisting different types of stresses without fracturing under normal circumstances.
1.The question below refers to the following graph.
What is the approximate period of this wave?
15 centimeters
15 seconds
10 seconds
5 seconds
2. The question below refers to the following graph.
What is the wavelength of this wave?
10 cm
15 cm
60 cm
cannot be determined
3. The question below refers to the following graph.
What is the frequency of this wave?
1 wave/sec
10 waves/sec
0.1 wave/sec
cannot be determined
1. 10sec
2. Can not be determined
3. 0.1wave/sec
Answer :
(1) T = 10 seconds
(2) Wavelength cannot be determined.
(3) Frequency, [tex]\nu=0.1\ waves/sec[/tex]
Explanation :
(1) From the given graph :
Time period of the wave is defined as the time taken by it to complete one cycle.
So, the period of this wave is (C) " 10 seconds".
(2) The distance between two consecutive crest or the trough is called the wavelength of the wave.
From the graph it is clear that the distance between two consecutive crests is 10 cm(see attached figure).
So, the correct option is (a) "10 cm".
(3) As the time period of the wave is 10 seconds.
So, [tex]f=\dfrac{1}{T}[/tex]
[tex]f=\dfrac{1}{10\ s}\ waves/sec[/tex]
[tex]f=0.1\ waves/sec[/tex]
So, the correct option is (c) " 0.1 wave/sec ".
Why is the reactor coolant water kept contained within the primary loop instead of allowing it to mix with the feed water and leave through the cooling tower? it is contaminated and radio active?
Answer:
Yes, It is contaminated and radio active
Explanation:
The coolant in the primary loop is actually in contact with the reactor fuel. So it will have some trace amount of the reactor fuel and all the other radioactive by products like cobalt.
Also the neutrons in the reactor will convert the hydrogen in the water into radioactive tritium. and the oxygen into radioactive nitrogen.
This is why the primary loop water is kept isolated from the feed water.
which of the following discoveries can be directly attributed to the use of imaging radar
Final answer:
Imaging radar has enabled the monitoring of flood extents, improved aircraft detection via Doppler technology, and contributed significantly to space exploration by mapping celestial bodies.
Explanation:
The use of imaging radar has led to several significant discoveries. One such discovery is the ability to monitor flood extents under any weather condition, as demonstrated by data from the European Resource Satellite (ERS-1), which clearly depicted the smooth surface of a flooded Mississippi River deflecting radio signals away while the surrounding rougher land reflected them. Additionally, the Doppler radar technology has enabled the differentiation of aircraft from ground echoes by leveraging the Doppler shift, significantly improving aerial detection systems. Beyond aviation and weather forecasting, radar has been instrumental in space exploration, determining distances to planets, rotation periods of Venus and Mercury, and mapping the terrain of various celestial bodies with high resolution.
((((Psychology))))According to Rubin, the desire to share your innermost thoughts and feelings is:
A. attachment.
B. caring.
C. intimacy.
D. all of the above.
Which of the following are disadvantages of solar energy? Check all that apply. A. It contributes to global warming. B. It is expensive. C. It is not equally effective for all areas of the world. D. It is not effective at all times of day.
you stretch a spring by a distance of 0.3 m. the spring has a spring constant of 440 n/m. when you release the spring, it snaps back. what is the kinetic energy of the springs as it reaches its natural length?
Answer:
19.8 J
Explanation:
According to the law of conservation of energy, the total mechanical energy of the spring (sum of kinetic energy and elastic potential energy) must be conserved:
[tex]K_i + U_i = K_f + U_f[/tex] (1)
where we have
[tex]K_i[/tex] is the initial kinetic energy of the spring, which is zero because the spring starts from rest (2)
[tex]U_i[/tex] is the elastic potential energy of the spring when it is fully stretched
[tex]K_f[/tex] is the kinetic energy of the spring when it reaches the natural length
[tex]U_f[/tex] is the elastic potential energy of the spring when it reaches its natural length, which is zero because the stretch in this case is zero (3)
So
[tex]U_i = \frac{1}{2}k(\Delta x_i)^2[/tex]
where
k = 440 N/m is the spring constant
[tex]\Delta x_i = 0.3 m[/tex] is the initial stretching of the spring
Substituting,
[tex]U_i = \frac{1}{2}(440)(0.3)^2=19.8 J[/tex]
And so using eq.(1) and keeping in mind (2) and (3) we find
[tex]K_f= U_i = 19.8 J[/tex]
50 POINTS!! I'M BEING TIMED, PLEASE HURRY!!
A box is sitting on the floor. It is then pulled with a force, Ft. The free-body diagram of the box is shown. Which describes the motion of the box? It is moving up with a net force of 20 N. It is moving to the right with a net force of 10 N. It is in dynamic equilibrium with a net force of 0 N. It is in static equilibrium with a net force of 0 N.
A car travels straight for 20 miles on a road that is 30 degrees north of east what is the east component of the cars displacement to the nearest tenth of a mile
*a small object with a momentum of 6 kg∙m/s to the west approaches head-on a large object at rest. the small object bounces straight back with a momentum of 5 kg∙m/s. what is the change in the momentum of the small object? what is the impulse exerted on the small ball? what is the impulse exerted on the large object?
The impulse exerted on the large object will be [tex]J=11\ kg\frac{m}{s}[/tex]
what will be the impulse?1) The change in the momentum of the small object is given by the difference between its final momentum and its initial momentum:
[tex]\Delta p=(p_f-p_i)[/tex]
where [tex]p_f\ \ p_i[/tex] are the final and initial momentum of the small object. Substituting the numbers of the problem, we find
[tex]\Delta p=-5-6=-11\ \frac{kgm}{s}[/tex]
where we put a negative sign in front of pf because the direction of the object after the collision is opposed to its initial direction.
2) The impulse is equal to the product between the force applied to an object and the time interval:
[tex]J=F\times \Delta t[/tex] (1)
since the force is the product between the mass and the acceration: F=ma, and the acceleration is equal to the change in velocity divided by the time, we can rewrite (1) as
[tex]J=F\times \Delta t=ma\Delta t=mv\frac{\Delta t}{\Delta t}=mv=\Delta p[/tex]
So, the impulse is equal to the variation of momentum. Therefore, the impulse exerted on the small object is
[tex]J=\Delta p=-11\ \frac{kgm}{s}[/tex]
3) We have to find the final momentum of the large object. Initially, its momentum is zero, because it is at rest. Using the law of conservation of momentum,
[tex]p_i+0=p_f+P_f[/tex]
where are the final and initial momentum of the small object, while is the final momentum of the large object. By substituting the numbers we had before:
[tex]P_f=p_i-p_f=6-(-5)=11\ \frac{kgm}{s}[/tex]
So, the impulse exerted on the large object is equal to its variation of momentum:
[tex]\Delta p=P_f-p_i=11-0=11\ \frac{kgm}{s}[/tex]
Hence the impulse exerted on the large object will be [tex]J=11\ kg\frac{m}{s}[/tex]
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How does electromagnetic induction happen?
Which of the following is an example of a safe laboratory produced?
A) eating or drinking from laboratory glasware
B) Tying back long hair and lose clothing
C) testing an odor by directly inhaling the vapor
D) touching hot objects with your bare hands
Which of the following best describes acceleration
A. S/M
B. M/S
C. M2
D. M/S2
which of the following ideas provided an important step toward a more complete understanding of blackbody radiation?
Answer:
Light is composed of discrete chunks that must be absorbed as units
Explanation:
The headlights of a typical truck are powered by a 12 V battery. What current do they draw if the resistance is 4.8 ohms?
The headlights of a typical truck are powered by a 12 V battery, then the current they draw if the resistance is 4.8 ohms would be 2.5 Ampere.
What is resistance?Resistance is the obstruction of electrons in an electrically conducting material.
V=IR
As given in the problem, the headlights of a typical truck are powered by a 12 V battery, the find out the current drawn if the resistance is 4.8 ohms.
By using Ohm's Law,
The voltage of the battery = 12 volt
The resistance of the resistor = 4.8 Ohm
V = I × R
12 = I × 4.8
I = 12 / 4.8
I = 2.5 Ampere
Thus, If the headlights of a typical truck are powered by a 12 V battery, then the current they draw if the resistance is 4.8 ohms would be 2.5 Ampere.
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PLEASE HELP!!!! 15 point!!!!!
Scientist tested the effect of a fertilizer on the growth of plants. They had two sets of plants Group A which gets fertilizer water & and Group B which gets only water and sun (but equal amounts to Group A)
1. Explain how this scenario is a controlled experiment and identify the manipulated variable?
2. If the scientist only performed one experiment but it supported their hypothesis why can it not be considered a theory?
Which changes in an electric motor will make the motor stronger? Check all that apply.
To strengthen an electric motor, increase the number of coils, enhance the magnetic field's strength, and optimize the commutation process.
Explanation:To make an electric motor stronger, several changes can be implemented. Increasing the number of coils in the motor will increase the torque, as the magnetic force exerted on each coil contributes to the overall twisting force on the motor's shaft. Enhancing the strength of the magnetic field within the motor, either by using stronger magnets or by increasing the current that produces the magnetic field, can also lead to a more powerful motor. Finally, ensuring the efficiency of the commutation process - the timing of the current's reversal to maintain continuous torque - is also crucial for motor strength. Factors such as the precise adjustment of commutators and brushes can minimize energy loss and improve performance.
Without the skeletal system, the body could not fight off infection. Please select the best answer from the choices provided. T F
Answer:
TRUE
Explanation:
got it right on edge 2022.
The statement Without the skeletal system, the body could not fight off infection is false.
The skeletal system provides support, protection, and movement for the body, and it also plays a role in the production of blood cells through bone marrow. However, the primary function of fighting off infections is carried out by the immune system, which includes the lymphatic system, the spleen, the thymus, and bone marrow, among other components. While bone marrow is part of the skeletal system and is crucial for producing immune cells, the skeletal system itself is not the sole or primary defense against infection. Therefore, the statement is incorrect because it overstates the role of the skeletal system in immune function. The immune system, not the skeletal system, is specialized to fight off infections
The slope of a Velocity versus Time graph will tell you the object’s what?
A) Acceleration
B) Change in position
C) Velocity
Thanks
The air in a cool region underneath cloud cover will have _____ a region with no cloud cover.
Answer:
The air is a homogeneous mixture of gases that make up the Earth's atmosphere, which remain around the planet by the attraction force of gravity.
Its properties changes with the altitude, the pressure, the temperature and the density. For example, there is a relation that is inversely proportional between the temperature and the air density.
When the temperature decreases the density increases.
Therefore, the air in a cool region of the atmosphere will be denser than the air in a hot region of the atmosphere.
In other words:
The air in a cool region underneath cloud cover will have a higher density than a region with no cloud cover
photoelectric effect definition
which statement best describes Gay-Lassac’s law
Gay-Lussac's law states that the pressure of a given amount of gas is directly proportional to its temperature on the Kelvin scale, provided the volume is constant. This was initially discovered by Guillaume Amontons and later refined by Joseph Louis Gay-Lussac. The mathematical representation is P proportional to T, P = constant × T or P = kx T.
Explanation:The best description of Gay-Lussac's law is that it states that the pressure of a given amount of gas is directly proportional to its temperature on the Kelvin scale when the volume is held constant. Guillaume Amontons was the first to empirically establish this relationship between pressure and temperature of a gas around 1700, and Joseph Louis Gay-Lussac defined the relationship more accurately around 1800. This relationship is expressed mathematically as PxT or P = constant × T or P = kx T.
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Ron hits his golf ball but is disappointed when it doesn't follow the course to the left. what does newton's first law of motion say about the travel of an object?
a.every action has an equal and opposite reaction applies.
b.inertia accelerates due to the unbalanced forces present.
c.an object at rest will move when external force is applied.
d.it will travel in a straight path unless changed by an external force. eliminate
Answer: the answer is D if you do t wanna read all that
What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche?
During an avalanche, the ___energy of the snow on the mountain is converted into ___ energy as the snow cascades down.
Drop down one: Elastic
Kinetic
Potential
Radiant
Drop down two: Chemical
Kinetic
Nuclear
Potential
Which statement is true? A) All waves travel at the same speed through any medium. B) All waves travel at the same speed if no medium is present. C) Electromagnetic waves require a medium, but mechanical waves do not. D) Mechanical waves require a medium, but electromagnetic waves do not. Eliminate
Which of the following are more reactive than tin?
Check all that apply.
A. Gold
B. Calcium
C. Aluminum
D. Copper
pick more than one it multiple answer
B and C are right for apex!!
When light waves strike a blue object, what happens to the light waves of all colors except blue?
Answer:
All colors are absorbed by the object except blue color.
Explanation:
When a white beam of light any object the light beam gets dispersed in its constituent colors. The object reflect a single color and absorb all remaining colors. So the object appears of the color which is reflected by object.
When the light beam strikes the blue object it gets dispersed in its constituent colors. All the colors are absorbed by the object except blue color. Blue color is reflected by the object.
Thus, the object appears of blue color.