Answer:
C.) The substance that gets dissolved
Explanation:
Because i am a wise man
Question 33
Why can human ears hear dolphins' vocalizations while under the water but cannot hear them well on land?
A
The waves in the water travel faster and at a higher frequency than they travel on land.
B
The waves in the water travel faster and at a lower frequency than they travel on land.
C
The waves in the water travel slower and at a higher frequency than they travel on land.
D
The waves in the water travel slower and at a lower frequency than they travel on land.
Answer:
A. The waves in the water travel faster and at a higher frequency than they travel on land.
Explanation:
The main reason why human ears can hear dolphins' vocalizations while under the water but cannot hear them well on land is because water is denser than air and air particles travel faster in denser particles.
Denser particles also ensures that the frequency of the waves move faster which in turn produces a faster and louder result.
How much potassium nitrate, KNO3, would completely dissolve in 100g of water at 40℃?
A. 28 grams
B. 108 grams
C. 45 grams
D. 65 grams
To keep cool in the summer months, you decide to design and build your own hand-held fan. The fan's electrical circuit will run off of 4 AA batteries (each with a voltage of 1.5 V) and must not exceed 0.050 A of current. You visit your local Radio Shack and find that resistors are sold in five varieties: 5 Ohm, 10 Ohm, 12 Ohm, 20 Ohm, 50 Ohm. Each resistor costs 8 cents. What set of resistors should you buy to minimize cost?
Answer:
Two 50 Ohm Resistors, One 20 Ohm Resistor.
Explanation:
For the given current and voltage specifications, the resistance can be calculated by Ohm's Law:
[tex]V = IR\\\\R = \frac{V}{I}[/tex]
where,
R = Resistance = ?
V = Voltage = (1.5 V)(4) = 6 V
I = 0.05 A
Therefore,
[tex]R = \frac{6\ V}{0.05\ A}\\\\R = 120\ \Omega\\[/tex]
Now, to minimize the cost we will buy the following set of resistors:
Two 50 Ohm Resistors, One 20 Ohm Resistor.
A 480 Ω resistor is connected in series to a 360 Ω resistor and a 120-V power supply.
a. Draw the circuit.
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what is mechanics inbranches of physics
Answer:
Mechanics: A branch of physics in which we study about the object and properties of an object in form of a motion under the action of the force.
0.125 C of charge flow out of a
5.00 V battery in 6.30 s. How
much resistance is attached to the
battery?
(Hint: What is the definition of current?)
(Unit = Ohm)
Answer:
Resistance = 252.53 Ohms
Explanation:
Given the following data;
Charge = 0.125 C
Voltage = 5 V
Time = 6.3 seconds
To find the resistance;
First of all, we would determine the current flowing through the battery;
Quantity of charge, Q = current * time
0.125 = current * 6.3
Current = 0.125/6.3
Current = 0.0198 A
Next, we find the resistance;
Resistance = voltage/current
Resistance = 5/0.0198
Resistance = 252.53 Ohms
How would mass determine if an egg will crack or not and why?
Answer:
the force of the egg striking the floor or ground is greater than the force that the egg shell can exert on itself to keep its shape, the egg will break. Some eggs are stronger than others, depending on how thick the shell is.
Explanation:
credits :- http science line
name and discuss five good reasons why a crop can distribute well in a new areas of environment
Answer:
The description as per the given scenario is described below throughout the segment.
Explanation:
Plant development relies mostly on the earth's weather conditions as well as the quantity of sunshine it gets.The key elements influencing farming operations include temperature, natural vegetation as well as landforms.The smart utilization of genetic variation for the development of better plants could make an important contribution to environmental protection.Crop diversification includes verifying that appropriate amounts of food are provided not just steady as well as sustained.Species of crops resistant to parasites adverse conditions could decrease this need for dangerous chemicals.diferencias que existen entre la marcha cuando caminamos, corremos sin balón y corremos con balón
Answer:
La principal diferencia que existe entre la marcha cuando caminamos y cuando corremos, sea con o sin el balón, es la velocidad: al caminar, la velocidad es mucho menor que al correr, y a su vez, correr sin el balón da la posibilidad de correr mucho más rápidamente, debido a que no se requiere una coordinación entre los pasos y el control del balón.
Por otra parte, además de la velocidad, el ritmo cardiaco que se adquiere al caminar es mucho mas bajo que al correr, donde por causa del esfuerzo se aceleran las pulsaciones, aumentando la frecuencia cardiaca y, por lo tanto, la exigencia cardiovascular.
A proton traveling at a speed of 3.5x10 ^-6 m/s passes perpendicular to a uniform magnetic field of 4.2x10 ^-2 T. What is magnitude of the force on the proton while the proton is in the magnetic field?
Answer:
i think its 50
Explanation:
what is atom.......... ?
Answer: the basic unit of a chemical element.
Explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
hope this helps
An electric field of 6.1x 10^5 N/C is directed along a charge 2.9 x 10^-19 C. What
is the electric force on the charge?
Answer:
Electric field is a function 1/r^2
Explanation:
A block of copper with mass 0.500 kg is heated to 400. degrees Celsius from 290. degrees Celsius. The specific heat capacity of copper is 387 J/ (kg*C°). The heat absorbed by the copper block is
7.74 E5 J
7.74 E4 J
5.61 E4 J
2.13 E5 J
2.13 E4 J
The heat absorbed can be calculated using calorimetric equation. The heat absorbed by the copper block of mass 0.500 kg for the temperature difference of 290 to 400 degree Celsius is 2.13 E4 J.
What is calorimetric equation?Calorimetry is an analytical tool used to determine the heat energy absorbed or released by a system. The calorimetric equation connecting the mass m, temperature difference ΔT and specific heat capacity c is given by:
q = m c ΔT .
Given,
m = 0.500 kg
c = 387 J/(kg °C )
ΔT = 400 - 290 °C = 110°C.
Then, the heat energy absorbed by the copper block is ;
q = 0.50 kg × 387 J/(kg °C ) × 110°C
= 2.13 E4 J
Therefore, option E is correct.
Find more on calorimetry:
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Is water still part of the cycle when it is underground? Explain.
Answer:
hi
Explanation:
Which statement correctly describes magnetic field lines?
Answer: I believe the correct answer would be they join north pole to south pole. The direction of these lines always goes from the direction of north to south pole. These lines forms loops in order to favor the way which requires or has less resistance. Hope this helps.
Which one of these are considered as mechanical energy?
Chemical energy
Nuclear energy
Thermal energy
Radiant energy
Electrical energy
gravitational potential energy
rotational kinetic energy
translational kinetic energy
elastic potential energy
Answer:
gravitational potential energy
Explanation: Hope it helps you:)))
have a good day
How do astronomers describe the scale of the universe?
No one can know the size of the universe, it may in fact be infinitely large.
Explanation:
No one knows the size of the universe because we can't see the entire universe. We can only see the part that is close enough to us that there has been time for the light from it to arrive here. What that means is any part of the universe that it will take more than 14.5 billion years for light to travel to us can not bee seen. It is possible that the universe has no size, that is it is infinite.
We can measure what we call the "visible universe" and that is a sphere around us with a radius of about 50 billion light years, the reason it is more than the age of the universe (14.5 billion years) is because the universe is expanding more rapidly than the speed of light.
The way scientists measure the size of the visible universe is with what is called red shift. Similar to the way a car horn's pitch changes as it passes you due to doppler shift, light too has a shift in is frequency or color depending on if it is moving away or toward you. As light moves away from you it shifts for red and the faster it is moving away the more it shifts. We can estimate the distance objects are away by how much they are red shifted. When we look at the most distance objects we can see they are about 50 million light years away.
A geostationary satellite orbits the Earth in 24 hours along an orbital path that is parallel to an imaginary plane drawn through the Earth's equator. Such a satellite appears permanently fixed above the same location on the Earth. How high above the Earth's surface must it be located?
Answer:
approximately 35,786 km
Explanation:
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level. It maintains the same position relative to the Earth's surface.
Match the items on the left with the best corresponding statement on the right. 1 . chromosomes contains tightly packaged DNA molecules 2 . Carl Correns the person who experimented with four o'clocks 3 . incomplete dominance a change in a gene that results from a reproductive mistake 4 . DNA cell division in which the new cells have the same number chromosomes of as the parent cell 5 . mitosis the person who discovered the principles of genetics 6 . Gregor Mendel the special molecule that is able to store and recover information about traits 7 . R.C. Punnett the person who devised a system of squares used to record genetic problems 8 . mutation a condition in which neither gene of a pair is dominant; instead, they show a blended effect 9 . meiosis cell division in which the new cells have one-half of the original number of chromosomes
Answer:
1 and 4, 2 and 3, 5 and 9, 6 and 8
Explanation:
7 would not have a pair because there is not enough statements
a Esboza una gráfica desplazamiento-tiempo en la que se representen dos oscilaciones completas de un oscila
armónico simple, con un periodo de 2,0s y una amplitud de 5,0 cm
b Dibuja sobre los mismos ejes la forma de la onda de un oscilador cuya frecuencia es el doble de la anterior y co
misma amplitud
c Dibuja sobre los mismos ejes la forma de la onda de un oscilador con una amplitud de 2,5 cm y la misma
frecuencia del primer oscilador, pero que está desfasado un cuarto de fase respecto a este
Calculate the electrical energy use of the microwave in 120 V circuit has 7.5 A current flow, if it used for 0.05 hours
Answer:
162 KJ
Explanation:
The electrical energy can be calculated using the formula
E = V×I×t
Where, V= voltage = 120 V
I is current in ampere = 7.5 A and t is time in seconds
1 hour = 3600 sec
Therefore, 0.05 hour = 3600×0.05 = 180 sec
Substitute the values in above equation find electrical power
E = 120×7.5×180
= 162000 J
= 162 KJ
Therefore, the electrical energy use of the microwave = 162 KJ
Which path would the laser take when entering the water from air?
brown or black
easy:- what are the instruments used in measuring temperature
Answer:
Instrumentos Para Medir La Temperatura
Termómetro de máxima y mínima:
Termómetro metálico:
Pirómetro:
Termohidrógrafo:
The particles of a gas are packed tightly together.
Answer:
False
Explanation:
Answer:
False, they are much loose than any of the other states of matter
what is meant by one watt power?
Answer:
one watt power is defined as power produced when one joule of work is done in one second.
hope it helps
stay safe healthy and happy
the diagram below represents the orbits of earth, comet temple-tuttle, and planet x, another planet in out solar system. arrows on each orbit represent the direction of movement. which objects orbit would have and eccentricity close to 1?
Answer:
the most elliptical orbit is that of COMETA
Explanation:
The eccentricity of a curve in defined as the ratio between lacia to the focus, called c and the value of the axis greater than
ε = c / a
if we use Pythagoras' theorem
c = [tex]\sqrt{a^2 - b^2}[/tex]
substituting
ε = [tex]\sqrt{1 - (b/a)^2 }[/tex]
if ε = 0 we have a circumference
In the diagram presented the orbit of the comet is an ellipse a> b
ε=[tex]\sqrt{1- x} \\ x = (\frac{b}{a} )^2[/tex]
if we expand in series
ε = 1 - x/2
ε= [tex]1 - \frac{1}{2} \ (\frac{ b}{a} )^2[/tex]
if we neglect the non-linear terms
ε = 1
Earth's orbit is a small ellipse
b / a = 149 10⁶ / 151 10⁶
b / a = 0.98675
ε = [tex]\sqrt{1- 0.98675^2}[/tex]
ε = 0.16
a very small ellipse
Planet X, despite not having data, it seems that the sun is in the scepter of the orbit, so b = a
therefore both the semi-axes of the curve
e = a / b
Consequently, the most elliptical orbit is that of COMETA.
What distance did the boulder with a force of 24 Newtons travel if 240 joules of work was done on it?
d = 10 m
Explanation:
Work = force × distance
or
distance = work/force
= (240 J)/(24 N)
= 10 m
The velocity-time graph shows the motion of a truck. Find (i) its velocity , (ii) its acceleration and (iii) the distance covered by the cyclist in 15 seconds
no spam please and answer fast!
Answer:
(iii) 300m
Explanation:
(i) The velocity of the cyclist is constant with time, the rate of the change of the velocity with the time is zero. So the acceleration of the object will be zero.
(ii) According to the graph we observe that the cyclist is moving with the same velocity all the time, therefore, the velocity of the cyclist is [tex]20m/s^{-1}[/tex]
(iii) Apply the formula: (speed = velocity x time)
s = vt
s = [tex]20m/s^{-1}[/tex] x 15s
s = 300m
Hope this helps :)
It’s IT but I really need the answer
The answer to the question is logic
3. Identify which of the following probably would not have an effect on the climate of a region:
a. the region is next to a mountain range
b. the region is on the equator
c. a thunderstorm just blew through the region
d. the region is next to the Atlantic Ocean