A piece of iron that behaves like a magnet when it is touching a permanent magnet.
An oceanic depth-sounding vessel (sonar) surveys the ocean bottom with ultrasonic sound that travels at an average of 1522m/s. How deep is the water if the time delay of the echo from the ocean floor is 2.0s?
Answer:
1522 m
Explanation:
The ultrasound wave takes t=2.0 s to travel from the vessel to the ocean bottom, and then back to the vessel.
This means that the time the wave takes to travel from the vessel to the ocean bottom is just half of this:
[tex]t=\frac{2.0 s}{2}=1.0 s[/tex]
The wave travels at a speed of
v = 1522 m/s
So, we can find the distance between the vessel and the ocean bottom by using the equation of the uniform motion, and we find:
[tex]d=vt=(1522 m/s)(1.0 s)=1522 m[/tex]
In the following lever system, what is the counter-clockwise torque?
18 Nm
240 Nm
360 Nm
480 Nm
the correct answer is 480nm
Answer:
D: 480
Explanation:
A person pushes a crate up a 4-m high ramp for a distance of 18m.
a) What is the mechanical advantage of the ramp?
b) How hard does the person have to push if the crate weights 400 N
a) 4.5
The mechanical advantage of a frictionless ramp is given by:
[tex]MA=\frac{L}{h}[/tex]
where
L is the length of the ramp
h is the height of the ramp
In this problem,
L = 18 m
h = 4 m
Substituting these values into the formula, we find
[tex]MA=\frac{18 m}{4 m}=4.5[/tex]
b) 88.9 N
For a frictionless ramp, the input work is equal to the output work:
[tex]W_i = W_o\\F_i L = F_o h[/tex]
where
[tex]F_i[/tex] is the force applied by the person
L = 18 m is the length of the ramp
[tex]F_o = 400 N[/tex] is the output force, which corresponds to the weight of the crate
h = 4 m is the height of the ramp
Solving the equation for [tex]F_i[/tex],
[tex]F_i = \frac{F_o h}{L}=\frac{(400 N)(4 m)}{18 m}=88.9 N[/tex]
When giving feedback to children, your message is most useful when A. making light of the situation. B. exerting power. C. giving a clear message that matches your emotion. D. using a honeyed voice.
C. is the right answer
When giving feedback to children, your message is most useful when . giving a clear message that matches your emotion.
What is feedback?Feedback occurs when a system's outputs were being used as inputs again as part of a cause-and-effect circuit or loop. Thus, the system is said to feed back on itself. When used with feedback systems, the concept of causality must be treated. Simple causal reasoning about a feedback system is challenging because first system affects the second, which impacts the first, creating a circular argument. Because of this, it is difficult to reason utilizing cause and effect, and it is required to look at the problem as a whole.
What is message?A message is a brief item of communication that the source intended for a certain recipient or group of recipients to read. There are many other ways to deliver a signal, such as courier, telegraphy, carrier pigeon, and electronic bus. A broadcast's content might have been a message.
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Over a span of 6.0 seconds, a car changes its speed from 89 km/h to 37 km/h. What is its average acceleration in meters per second squared (m/s2)?
Answer: Average acceleration is -2.407 [tex]\frac{m}{s^{2}}[/tex]
Explanation:
Average acceleration is equal to change in velocity divided by time taken
therefore, [tex]a=\frac{Vf-Vi}{t}[/tex]
=> [tex]a=\frac{37-89}{6}\times \frac{5}{18}\frac{m}{s^{2}} = -2.407 \frac{m}{s^{2}}[/tex]
MOST elements on the periodic table are
A) gases
B) metals
C) nonmetals
D) rare earth elements
Answer:
B
Explanation:
MOST elements on the periodic table are metals.
Answer:B
which of the following is not transparent? A. clear glass b. plastic c. water d. tracing paper
D is the answer I’m pretty sure
Please help
78% nitrogen, 21% oxygen
Ionosphere
temperature falls to -93*C
temperature continue to rise up to 1500*C
temperature drops from 17 to -52*C
protective ozone layer
UV radiation causes temperature to rise
Answer:
Thermosphere
temperature continue to rise up to 1500*C
Ionosphere
Mesosphere
temperature falls to -93*C
Stratosphere
protective ozone layer
UV radiation causes temperature to rise
Troposphere
78% nitrogen, 21% oxygen
temperature drops from 17 to -52*C
Explanation:
AlBr3 + K2SO4 → KBr + Al2(SO4)3
What are the coefficients required to balance the chemical equation?
A) 1,3,6,1
B) 2,1,6,1
C) 2,3,1,1
D) 2,3,6,1
Answer: D
Explanation:
Based on the balanced equation of the reaction, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1., option D.
What is the balanced equation of the reaction between aluminium bromide and potassium sulfate?The balanced equation of the reaction between aluminium bromide and potassium sulfateis given below:
2AlBr3 + 3 K2SO4 → 6KBr + Al2(SO4)3
Therefore, the coefficients of the balanced equation are as follows; 2, 3, 6 and 1.
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Like his parents, Thomas is short, stocky, and heavyset. Although he exercises regularly and eats a well-balanced meal, his body composition stays the same. Explain what factor is most likely affecting his body composition..
Answer:The factor that is most likely affecting Thomas's body composition is genetics. Heredity influences the amount of fat a person possesses, and children with heavyset parents are more likely to be heavyset.
Explanation:
sample response
The factor that is affecting his body composition is genetic makeup.
The factors that affect body compositionThe body composition of an individual is the percentage of the body that is made up of fat, bone and muscles.
The percentage of each component found in an individual is determined by the following factors:
Gender, age, race, nutrition, physical activity, hormonal status andGenetic makeup.The deoxyribonucleic acid (DNA) of an individual can either have little or much effect on the body composition.
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The formation of a standing wave requires _____.
constructive interference between two waves with different frequencies
interference between the incoming and reflected waves of the same frequency
two waves that have been traveling over a long distance
the formation of a standing wave requires interferencethe incoming and reflected waves of the same frequency
Answer: The correct answer is "interference between the incoming and reflected waves of the same frequency"
Explanation:
Standing wave: Standing wave will form when two waves of equal frequency travelling in an opposite direction in the same medium. There is interference between the incoming and reflected waves of the same frequency.
These waves do not appear to move. There is an oscillation up and down in same phase. Standing wave consists of node and antinode.
Anti node: It is the location in the wave where the amplitude is minimum.
Node: It is the location in the wave where the amplitude is maximum.
Therefore, the correct option is "interference between the incoming and reflected waves of the same frequency ".
2. Which describes the law of reflection?
The angle of reflection equals the angle of incidence.
The angle of reflection is greater than the angle of incidence.
The angle of reflection is less than the angle of incidence.
Answer: Choice 1
Law of Reflection
Theta(i)=Theta(r)
Angle of incidence=Angle of reflection
Which describes the law of reflection?
The angle of reflection equals the angle of incidence. The angle of reflection is greater than the angle of incidence. The angle of reflection is less than the angle of incidence. Further explanationThe laws of reflection are, the incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence are lie in the same plane. The reflected ray and the incident ray are on the opposite sides of the normal.
The law of reflection states that when a ray of light reflects off a surface, then the angle of incidence is equal to the angle of reflection. Light is known to behave in a very predictable manner.
In the diagram the ray of light that approaching the mirror is known as the incident ray (labeled I), whereas the ray of light that leaves the mirror is known as the reflected ray (labeled R) .
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Grade: 9
Subject: physics
Chapter: reflection
Keywords: the law of reflection, reflection, incidence, the angle of incidence, angle
A 2.50 kg flower pot is pushed out a window this is at a height of 12.0m onto a spring with a spring constant of 800.N/m. How much does the spring compress if the ball comes to a stop.
Answer:
0.86 m
Explanation:
We can solve the problem by using the law of conservation of energy.
The initial mechanical energy of the flower pot is just gravitational potential energy, given by:
[tex]E_i = U = mgh[/tex]
where
m = 2.50 kg is the mass of the pot
g = 9.8 m/s^2 is the acceleration due to gravity
h = 12.0 m is the height
When the pot hits and compresses the spring coming to a stop, all this energy is converted into elastic potential energy of the spring:
[tex]E_f = U = \frac{1}{2}kx^2[/tex]
where
k = 800 N/m is the spring constant
x is the compression of the spring
Due to the conservation of energy,
[tex]E_i = E_f[/tex]
So we can write
[tex]mgh=\frac{1}{2}kx^2\\x=\sqrt{\frac{2mgh}{k}}=\sqrt{\frac{2(2.50 kg)(9.8 m/s^2)(12.0 m)}{800 N/m}}=0.86 m[/tex]
a train travels some distance with a speed of 30km/h and returns with a speed of 45km/h. Calculate the average speed of the train.
Answer:
let distance be D km
total time taken, T (hrs) = D/30 + D/50
Average speed , V = total distance/ total time = 2D/T = 2/(1/30+1/50) = 37.5 km/hr
Explanation:
Average speed = total distance / total time
= (30+45) km / 2hr
= 75 / 2
= 37.5 km/hr is the average speed of the train.
the weatherman reports the storm waves are about 2 meters high and 35 meters apart. What properties of waves is the reporter describing?
Answer:
Amplitude and wavelength
Explanation:
- The amplitude of a wave is the maximum displacement of the wave, measured with respect to the equilibrium position (so, for a water wave it is the maximum height of the wave relative to the equilibrium position)
- The wavelength of a wave is the distance between two consecutive crests (or throughs) of a wave. So, for a water wave, it is the distance between two consecutive waves
Therefore, in the example in the problem we have:
- 2 meters corresponds to the amplitude
- 35 meters corresponds to the wavelength
What happens to energy that is used to overcome friction?
It transforms into heat and gets dissipated to the surroundings in the natural way of moving from hot locations to cooler ones.
Which statement best explains acceleration?
i’m pretty sure the answer is B
Answer:
b
Explanation:
If a patient is receiving home care services this means they have a terminal illness true or false
False. Receiving home care services does not necessarily mean that a patient has a terminal illness.
Terminal illness and homecare services
Home care services are not exclusively for those with terminal illnesses; they cater to various needs.
These services extend beyond end-of-life care, encompassing chronic illness management, post-surgery recovery, palliative care, and support for the elderly.
Home care facilitates personalized healthcare delivery in the comfort of one's residence, promoting independence and enhancing the quality of life.
It is a flexible approach that addresses diverse medical conditions, allowing individuals to receive necessary assistance tailored to their unique health requirements.
Home care services do not exclusively mean a patient has a terminal illness. Home care can include hospice services for those with terminal illnesses, but it also caters to a range of other patient needs, such as recovery and long-term support. Hospice care provides comfort for terminally ill patients, often in their homes. The statement in the question is not true.
Explanation:If a patient is receiving home care services, it does not necessarily mean they have a terminal illness. While it is true that hospice care is often associated with terminal illnesses and focuses on providing comfort and support rather than cure-oriented treatments, home care can encompass a variety of services for patients with varying needs, including recoveries from surgeries, chronic illnesses, disability support, and more community-based, long-term care. Hospice care, specifically, supports terminally ill patients and their families by offering pain management, emotional support, and the opportunity for the patient to be in the comfort of their own home. However, not all patients in home care are in hospice or have terminal illnesses.
Which of the answers is most accuracy for balancing nuclear equations?
Answer:
#4
Explanation:
In balanced nuclear and chemical equations, the sums of the subscripts on each side of the equation and the sums of the superscripts are the same. The most useful quantity for counting particles is the mole. Steps for balancing a chemical equation involve identifying the most complex substance, balancing the atoms and polyatomic ions, and counting the numbers of atoms to ensure a balanced equation.
Explanation:In balanced nuclear equations, the sums of the subscripts on each side of the equation are the same, as are the sums of the superscripts.
The most useful quantity for counting particles is the mole. So if each coefficient is multiplied by a mole, the balanced chemical equation tells us that 1 mole of nitrogen reacts with 3 moles of hydrogen to produce 2 moles of ammonia. This is the conventional way to interpret any balanced chemical equation.
Steps in Balancing a Chemical Equation:
Identify the most complex substance.Beginning with that substance, choose an element(s) that appears in only one reactant and one product, if possible. Adjust the coefficients to obtain the same number of atoms of this element(s) on both sides.Balance polyatomic ions (if present on both sides of the chemical equation) as a unit.Balance the remaining atoms, usually ending with the least complex substance and using fractional coefficients if necessary. If a fractional coefficient has been used, multiply both sides of the equation by the denominator to obtain whole numbers for the coefficients.Count the numbers of atoms of each kind on both sides of the equation to be sure that the chemical equation is balanced.
Write a hypothesis about how the number of half-lives affects the number of radioactive atoms. Use the "if . . . then . . . because . . ." format and be sure to answer the lesson question: "How does the number of radioactive atoms change over time?"
answer- If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life.
Answer:
Explanation:
Answer:
Explanation:
The half life is the time taken for half of a radioactive substance to disintegrate.
The shorter the half life, the larger the decay constant and the faster the decay process.
For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.
With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.
If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.
If the number of half-lives increases, then the number of radioactive atoms decreases, because each half-life reduces the quantity of radioactive atoms by about half. This is due to the nature of radioactive decay, causing a consistent, exponential decrease over time.
Explanation:A hypothesis about how the number of half-lives impacts the number of radioactive atoms might be: If the number of half-lives increases, then the number of radioactive atoms decreases because approximately half of the atoms' nuclei decay with each half-life.
In the concept of radioactive decay, a half-life denotes the period of time it takes for half of the atoms in a radioactive sample to decay. When there are more half-lives that pass, this indicates more time has passed, and therefore more of the radioactive atoms would have decayed. Consequently, the number of radioactive atoms lessens over time due to this continuous decay.
For example, if you started with 1000 radioactive atoms and the half-life of this particular substance is 1 year, after one year (one half-life), there would be approximately 500 radioactive atoms remaining. After two years (two half-lives), around 250 atoms would remain, and so on. Hence, it's crucial to realize that the decrease in the number of radioactive atoms is exponential, not linear.
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Where would a positive test charge have the least potential energy?
actually the line through the midpoint and perpendicular to the line joining the two charges. that the positive and negative charges are equal in magnitude.
A positive test charge only has potential energy if there's a negative charge out there somewhere, attracting it.
As long as the positive charge is not right up close to the beckoning negative charge, it'll spring in that direction if you let it.
So the positive test charge doesn't run out of potential energy until it reaches the place of its heart's desire ... as far from other positive charges as it can get, AND up against or on top of the nearest negative charge.
A train traveling at 7.55m/s accelerates to a distance of 975m in 31.5 s. Whats the final velocity of the train?
A)227m/s
B)54.4
C)7.61
D)69.5
Answer:
B. 54.4 m/s
Explanation:
Using the equation;
S = ut + 1/2at²
Where;
v is the final velocity
u is the initial velocity,
a is the acceleration,
s is the displacement
Therefore;
975 =(7.55×31.5) + (0.5×a× 31.5²)
975 = 237.825 + 496.125a
496.125a = 737.175
a = 1.486 m/s²
But;
v = u + at
= 7.55 m/s + (1.486 × 31.5)
= 54.355 m/s
= 54.4 m/s
Therefore;
The final velocity is 54.4 m/s
which of the following is an example of a main sequence star
I know this question is old but it still needed an answer :-) hope this helps anyone who needs it!
Acid compounds contain a.Oxygen B. Ion c. Hydrogen
Answer:
c hydrogen
Explanation:
The answer is Hydrogen
Number the steps of stellar evolution in the correct order
Answer:
1.) Nebular cloud of gas and dust.
2.) Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.
3.)Condensed material begins to combine and form a core center, as it warms, a protostar is formed.
4.)Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.
5.) Stellar core heats as it grows; nuclear fusion begins and a star is born.
6.) Nuclear energy runs out; death: possible supernova.
Hope this helped you out!
A cyclist travels at a constant velocity of 3.2m/s westward, then speeds up with a steady acceleration of 2.3m/s^2. Calculate the cyclist’s speed after accelerating for 5.0 s.
*also tell how to work out problem*
Answer:
14.7 m/s
Explanation:
In this problem we have
u = 3.2 m/s is the initial velocity of the cyclist
a = 2.3 m/s^2 is the acceleration of the cyclist
We want to know the cyclist speed after a time of
t = 5.0 s
So we can use the following equation:
[tex]v=u+at[/tex]
Substituting the numbers, we find
[tex]v=3.2 m/s + (2.3 m/s^2)(5.0 s)=14.7 m/s[/tex]
which is greater -7 or -3
Answer:
-3 because its closer to 0
Explanation:
Answer:
-3
Explanation:
Because -3 is closer to 0 the closer you are to 0 in negative numbers the higher the number is
which ocean zone has the most sunlight? A. Abyssopelegic B. Bathypelagic
C. Hadalpelagic D. Mesopelagic
The answer is D, Mesopelagic.
The ocean zone that has the most sunlight is Mesopelagic. The correct option is D.
What is Mesopelagic?The Mesopelagic zone is a scope of sea depth that beginnings from 650 feet beneath the water's surface to around 3,280 feet underneath. Light entrances from the outer layer of the sea almost scatter at this area. The most widely recognized organic entities found in the mesopelagic zone are little fish, squid, and basic shellfish.
This region receives most of the sunlight.
Thus, the correct option is D.
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Which describes a reflected image in a plane mirror?
A. The image is upside-down and about as far away from the mirror as the reflected object.
B. The image is right-left reversed and about as far away from the mirror as the reflected object.
C. The image appears right side up and larger than the reflected object.
Answer:
B. The image is right-left reversed and about as far away from the mirror as the reflected object.
Explanation:
A plane mirror is used in several ways in our life, from the mirror that we have on the bathroom to the mirrors we use on cars, the main difference is that the mirror reflects the image reversed on the Vertical axis, which means that the left is the right and the right is the left, a mirror also protrays objects at a certain distance, about as far away from the mirror as the reflected object but they are actually closer in real life.
Answer:
B. The image is right-left reversed and about as far away from the mirror as the reflected object.
how can magnetic and electric fields be demonstrated?
Answer:
To demonstrate that an electric current (i.e., moving electric charge) generates a magnetic field, all you need do is simply place a magnetic compass next to a wire in a circuit. When current is passed through the wire, the compass will deflect, indicating the presence of a magnetic field circling the wire.
Explanation:
Electric field is always associated with magnetic field.
Explanation:
Relationship between electric and magnetic fields can be explained by the following example. Consider a wire and a magnetic compass placed close together.
When current is flowing through the wire, the needle in the magnetic compass will deflect showing some value indicating the presence of magnetic field during the experiment. This indicates that the electric field is generally accompanied with the magnetic field.