Answer:
conduction
Explanation:
How is the volume flow rate of water out of the tank, dVdt, related to the flow speed v ? Express your answer in terms of some, all, or none of the variables v , d, the acceleration due to gravity g, and the constant π.
Answer:
[tex]\frac{dV}{dt}= \frac{\pi d^2}{4}v[/tex]
Explanation:
The rate of volume flow out of tank can be expressed as:
[tex]\frac{dV}{dt} = A\frac{dL}{dt}[/tex]
where,
dV/dt = Volume flow rate
A = Cross-sectional area of outlet = πd²/4
d = diameter of circular outlet
dL = Displacement covered by water
dt = time taken
but we know that:
Velocity = υ = displacement/time = dL/dt
Substituting the values of "dL/dt" and "A" in the equation, we get:
[tex]\frac{dV}{dt} = \frac{\pi d^2}{4}v[/tex]
This is the expression for volume flow rate dV/dt, on terms pf v, d.
Is it possible for the velocity of an object to be zero and its acceleration not zero?
Explanation:
Yes, it is possible to have zero speed while accelerating, but only for a moment. ... acceleration is the rate at which the speed and direction of an object changes over time, so whenever an object goes through zero speed while reversing directions, it has non-acceleration. zero but a speed of zero.
1
(01.04 MC)
Which of the following is true of photosynthesis but not of cellular respiration? (3 points)
Photosynthesis releases oxygen gas as a product.
Photosynthesis occurs in all organisms.
Photosynthesis requires glucose as a reactant.
Photosynthesis is a process in which glucose is broken down.
2.
(01.04 MC)
Which of the following describes the calculation for net primary productivity? (3 points)
Subtracting macronutrients from micronutrients
Adding primary and secondary productivity
Subtracting cellular respiration from gross primary productivity
Multiplying gross primary productivity by cellular respiration
3.
(01.04 LC)
Ecosystems that have a high primary productivity can convert solar energy to biomass rapidly. (3 points)
False
True
Answer:
1. Photosynthesis releases oxygen gas as a product.
2. Subtracting cellular respiration from gross primary productivity
3. True
Explanation:
1. Photosynthesis is the process by which autotrophic organisms synthesize their food in form of sugars in the presence of sunlight. Photosynthetic process combines carbon dioxide (CO2) and water (H2O) to form glucose (C6H12O6) and oxygen gas as products. The equation is as follows:
6CO2 + 6H2O → C6H12O6 + 6O2
2. Net primary productivity, denoted by NPP, refers to the amount of biomass present in an ecosystem. It can be calculated by subtracting the amount of CO2 lost via cellular respiration from the amount produced called Gross primary productivity (GPP). That is;
NPP = GPP - cellular respiration
3. The process by which organic matter is synthesized from inorganic ones by organisms called AUTOTROPHS or PRIMARY PRODUCERS is called PRIMARY PRODUCTIVITY. Examples of autotrophic organisms are green plants, algae etc. Hence, in an ecosystem that have a high primary productivity, there would be a rapid rate of conversion of solar energy to biomass via PHOTOSYNTHESIS.
Can someone help me with this question please picture is above
Answer:
It should be B.
Explanation:
Because expansionary monetary policy works by expanding the money supply faster than usual or lowering short-term interest rates. It is enacted by central banks and comes about through open market operations, reserve requirements, and setting interest rates.
I hope this helped!!!
I would like to know why this is the correct answer
-The harder a gas pedal in a car is pressed, the faster the car’s velocity increases. Which phrase best describes the relationship between how hard the gas pedal is pressed and the acceleration of the car?
*There is both a positive correlation and causation
Answer:
see below
Explanation:
First, the obvious, as you press the gas pedal harder the acceleration goes up as well. Conversely, is you do not press the pedal, you will not accelerate. This determines that is I press the gas pedal, it will CAUSE the car to accelerate. This proves causation.
Now, correlation. The definition of correlation in statistics is any statistical relationship between two random variables or data. This simply means that these two events are connected to one another. A POSITIVE correlation is when two correlated events move in the same direction as one another. I have added a graph to help visualize this. In this problem as the gas is pressed harder, the acceleration increases. If the pressure on the pedal was decreased, then the acceleration also decreases. If the pressure on the pedal is constant, the the acceleration is constant.
I hope this helps!
What happens to a circuit's resistance (R), voltage (V), and current (1) when
you decrease the length of the wire in the circuit?
O A. Rincreases.
V decreases.
I decreases.
B. R decreases.
Vis constant.
Zincreases
C. Ris constant.
Vincreases.
/ increases.
D. Rincreases.
Vis constant
I decreases
Answer:
D.
R increases
V is constant
I decreases
Explanation:
The resistance of a wire is given by the following formula:
[tex]R = \frac{(Resistivity)(L)}{A}[/tex]
It is clear from this formula that resistance is directly proportional to the length of wire. So, when length of wire is increased, the resistance of circuit increases.
The voltage in the circuit will be constant as the voltage source remains same and it is not changed.
Now, we can use Ohm Law:
V = IR
at constant V:
I ∝ 1/R
it means that current is inversely proportional to resistance. Hence, the increase of resistance causes the current in circuit to decrease.
Therefore, the correct option will be:
D.
R increases
V is constant
I decreases
A laser emits a beam of light whose photons all have the same frequency. When the beam strikes the surface of a metal, photoelectrons are ejected from the surface. What happens if the laser emits twice the number of photons per second
Answer:
the no. of ejected electrons per second will increase.
Explanation:
In photoelectric effect, when a light is incident on a metal surface it ejects some electrons from the metal surface. The energy of photon of light must be equal to or greater than the work function of that metal. All the extra energy above the work potential appears as the kinetic energy of the ejected electrons. So, greater he energy of photon greater will be the kinetic energy of the ejected electrons.
A single photon interacts with a single electron and ejects it only if its energy is greater than work function. So, the increase in no. of photons per second means an increase in the intensity of laser beam. And greater no. of photons, will interact with greater no. of electrons. So, the no. of ejected electrons per second will increase.
In terms of running the Earth's atmospheric processes, the significant energy comes from the Sun and ________. a. the Moon b. the next closest star c. reflection from Venus d. no other source
Answer: no other source
Explanation:
The Earth gets energy from the sun which includes both heat and light and these are necessary for chemical reaction.
When the energy from the Sun gets to the Earth, they come as solar radiation and included in such solar radiation are infrared, invisible light, X-rays, ultraviolet light, radio waves, and gamma rays.
We should note that no other source is required for the Earth to get energy. The sun supplies it its energy.
A satellite has a mass of 3.25 x 10^3 kg, while earth has a mass of 5.97 x 10^24 kg
Answer:
200N ;)
Explanation:
Answer:
200N
Explanation:
Consider a corn yield of 7,500 kg/hectare (equivalent to 120 bushels per acre). If 25 kg (one bushel) of corn consumed about 20m3 of water during the growing season, what is the ratio of the weight of corn to the weight of water consumed
Answer:
[tex]\frac{W_{1}}{W_{2}} = 0.5[/tex]
Explanation:
The ratio of the weight of corn to the weight of water consumed will be the same. Either we compare the total weights for the total amount of corn or we compare only a small proportion of it. So, we consider the given 25 kg of corn. So, the mass of corn is given:
m₁ = mass of corn = 25 kg
Now, for mass of water, we will use its density:
ρ₂ = m₂/V₂
m₂ = ρ₂V₂
where,
m₂ = mass of water = ?
V₂ = Volume of water consumed by 25 kg corn = 20 m³
ρ₂ = density of water = 1000 kg/m³
Therefore,
m₂ = (1000 kg/m³)/(20 m³)
m₂ = 50 kg
Now, we calculate the ration:
[tex]\frac{Weight of Corn}{Weight of Water} = \frac{W_{1}}{W_{2}} = \frac{m_{1}g}{m_{2}g}[/tex]
[tex]\frac{W_{1}}{W_{2}}=\frac{m_{1}}{m_{2}} = \frac{25 kg}{50 kg}[/tex]
[tex]\frac{W_{1}}{W_{2}} = 0.5[/tex]
To get an idea of how much thermal energy is contained in the world's oceans, estimate the heat liberated when a cube of ocean water, 3 km on each side, is cooled by 4 K. (Approximate the ocean water as pure water for this estimate.)
Answer:
Q = 4.52 10¹⁷ J
Explanation:
Thermal energy can be calculated with
Q = m c_{e} ΔT
in this case it indicates that we approximate seawater to pure water with
c_{e} = 4186 J/ kg K
with the density
ρ = m / V
m = ρ V
V = L³
we substitute
m = ρ L³
Q = ρ L3 c_{e} ΔT
calculate
Q = 1000 (3 103) 3 4186 4
Q = 4.52 10¹⁷ J
Two out-of-tune flutes play the same note. One produces a tone that has a frequency of 248 Hz, while the other produces 288 Hz. When a tuning fork is sounded together with the 248-Hz tone, a beat frequency of 20.0 Hz is produced. When the same tuning fork is sounded together with the 288-Hz tone, a beat frequency of 20.0 Hz is produced. What is the frequency of the tuning fork
Answer:
F = 268 Hz
Explanation:
The beat frequency is given as:
[tex]Beat Frequency = |Frequency 1 - Frequency 2|\\[/tex]|
So, for the first flute and tuning fork:
[tex]20 Hz = |248 Hz - F|[/tex]
where,
F = Frequency of tuning fork
F = 248 Hz ± 20 Hz
F = 268 Hz (OR) 228 Hz
Now, for the second flute and tuning fork:
[tex]20 Hz = |288 Hz - F|[/tex]
where,
F = Frequency of tuning fork
F = 288 Hz ± 20 Hz
F = 268 Hz (OR) 308 Hz
Since, 268 Hz is common from both calculations. Therefore, it will be the frequency of the tuning fork.
F = 268 Hz
how are a symbol and a model both examples of a representation?
Answer:
A symbol and a model are both examples of a representation because they are presented in place of the real thing.
Explanation:
A symbol is a sign, a letter, mark, token, figure, or image used to stand in place of an object, function, or process. For example, co2 is used in Chemistry to represent carbon dioxide. There are many symbols representing other objects or meanings. Mathematically, we can state that "a" equals 40. "a" is a symbol representing the numerical value "40." Similarly, a model is a representation of a structure or a person on a smaller scale. For example, Architects produce models of buildings and other projects that they design.
Representation is a defined description or portrayal of any object, person, or anything.
The symbols and models are examples of representation.
Symbols are used as a representation in the form of signs, marks, or images to portray the object or anything. For instance, the symbols such as Ag and Au are used to represent Silver and Gold, respectively.
A model is also a structural or diagrammatical representation of a large object or structure. For example, architects build up maps and charts for the design of the building.
Thus, the symbols and models are used as representations for several things, items, structures, and many more.
To know more about representation, refer to the following link:
https://brainly.com/question/992922
When a battery-powered flashlight is turned on, it releases more energy than it had when it was off.
True or False?
Answer:
True
Explanation:
When it's turn off, chemical energy is stored (the battery) in the flashlight, when it's turn on the chemical energy transfers into light and thermal energy.
A 0.2-kg stone attached to a string is swung in a circle with a radius 0.6 m on a horizontal frictionless surface. What is the tension in the string if the stone makes 150 revolutions per minute?
Answer:
The value is [tex]T = 29.58 \ N[/tex]
Explanation:
From the question we are told that
The mass of the stone is [tex]m = 0.2 \ kg[/tex]
The radius of the circle is [tex]r = 0.6 \ m[/tex]
The angular speed is [tex]w = 150 \ rpm = \frac{ 2 * \pi * 150 }{ 60 } = 15.7 \ rad/s[/tex]
Generally the tension in the string is mathematically represented as
[tex]T = m * r * w ^2[/tex]
=> [tex]T = 0.2 * 0.6 * 15.7 ^2[/tex]
=> [tex]T = 29.58 \ N[/tex]
A solenoid that is 133 cm long has a radius of 2.99 cm and a winding of 1740 turns; it carries a current of 3.91 A. Calculate the magnitude of the magnetic field inside the solenoid.
Answer:
The value is [tex]B = 0.0643 \ T[/tex]
Explanation:
From the question we are told that
The length of the solenoid is [tex]L = 133 \ cm = 1.33 \ m[/tex]
The radius is [tex]r = 2.99 \ cm = 0.0299 \ m[/tex]
The number of turns is [tex]N = 1740 \ turns[/tex]
The current it carries is [tex]I = 3.91 \ A[/tex]
Generally the magnitude of the magnetic field is mathematically represented as
[tex]B = \frac{\mu_o * N * I}{L}[/tex]
Here [tex]\mu_o[/tex] is the permeability of free space with value [tex]\mu_o = 4\pi *10^{-7} \ N/A^2[/tex]
=> [tex]B = \frac{ 4\pi * 10^{-7} * 1740 * 3.91}{0.133}[/tex]
=> [tex]B = 0.0643 \ T[/tex]
What is the water pressure at the deepest part of the ocean in the Challenger Deep in the Mariana Trench at 10,994 m below the surface.
Answer:
The pressure is 107417976.4 N[tex]m^{-2}[/tex]
Explanation:
The pressure of water at a given height/ depth can be determined by:
Pressure = σhg
Where: σ is the density of water, h is the height/ depth, and g is the gravitational force.
Given that; h = 10994 m, but σ = 997 kg/[tex]m^{3}[/tex] and g = 9.8 m/[tex]s^{2}[/tex]
Thus, the pressure of water at the deepest part of the ocean will be:
Pressure = 997 x 10994 x 9.8
= 997 x 107741.2
= 107417976.4
Pressure = 107 420 KN[tex]m^{-2}[/tex]
The pressure of water at 10994 m below the surface is 107417976.4 N[tex]m^{-2}[/tex]
An upright spring with a 96g mass on it is compressed 2 cm. When
released it travels 60 cm upwards. A) Calculate the spring constant. B)
Calculate its beginning speed when it takes off.
Answer:
I only know answer A and it's 2825.28 N/m, with rounding it's 2825.5
Explanation:
Use the m*g*h=1/2*k*x^2 equation
96*9.81*60=1/2*k*2^2
5650.56=2k
5650.56/2=2825.28N/m
An experimental electrical generator collects sunlight with mirrors and generates heat at a rate of 1.2 megawatts. The generator is mounted on the roof of an environmentally friendly building and is used to operate an elevator. The elevator has a maximum operating load of 8000 kg and a maximum velocity of 6 m/s.
A. Determine the power that the generator must supply to operate the elevator at its maximum operating
B. What is the efficiency of this system?
Answer:
a) 0.47MW
b) 39.24%
Explanation:
In order to find the power needed for the elevator to operate at its maximum capacity, we can make use of the following formula:
P=Fv
where P is the power, F is the force and v is the velocity.
The force the elevator must carry can be calculated with the following formula:
F=mg
where m is the mass of the elevator and g is the acceleration of gravity, so:
[tex]F=(8000 kg)(9.81 m/s^{2})[/tex]
F=78 480 N
so now we can make use of the power formula:
P=Fv
P=(78 480N)(6 m/s)
P=470 880W
P=0.47W
b)
In order to find the efficiency, we will suppose that the generator can generate a maximum of 0.47 W so we use the following formula:
[tex]efficiency = \frac{P_{in}}{P_{out}}*100\%[/tex]
[tex]efficiency=\frac{0.470880}{1.2}*100\%[/tex]
efficiency=39.24%
When you apply force at an angle to the direction of movement, ____ of the force does work. a. all c. some b. none d. a and b Please select the best answer from the choices provided A B C D
Answer:
your answer is some
Explanation:
just so you know i took the test and i got an 80% on edge
HEre now can somebody help!!
Pic is what i need help with
Answer:
which of the cars are speeding up: c
which of the cars or slowing down: a
which of the cars are maintaning a constant speed: b
Explanation:
Answer:
Explanation:
I gave a good enough explanation in your other posting. I'm sorry that I'm eating up your points.
The orange line is speeding up
The blue line is neither speeding up nor slowing down. It's speed is constant.
The green line is starting from 4 m/s and is slowing down to 0.
The diagram helps a lot. Thank you for that.
The crowd at a concert lifts a singer to a height of 2.2 m. The crowd uses a total of force of 600 N. How much work has the crowd done?
Answer:
1320 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 600 × 2.2
We have the final answer as
1320 JHope this helps you
Calculate the time needed to accelerate a 50 kg object from 2 m/s to 12 m/s if a force of 10 N is
applied.
Hi there!
[tex]\large\boxed{\text{50 seconds.}}[/tex]
Begin by calculating the acceleration on the object by using the formula
F = m · a (Newton's Second Law) where:
F = Force (N)
m = Mass (kg)
a = acceleration (m/s²)
Plug in the given values:
10 = 50 · a
10 = 50a
10 / 50 = a
a = 1/5 = 0.20 m/s²
Solve for the time using the kinematic equation:
Δv / a = t, or (vf - vi) / a = t
Plug in the acceleration along with the initial and final velocites into the equation:
(12 - 2) / 0.20 = 10 / 0.20 = 50 seconds.
A heater is rated to dissipate 1440 W when connected to a 120 V source. The current drawn by the device is
Answer:
The current drawn by the heater is 12 A.
Explanation:
Given;
power dissipated by heater, P = 1440 W
Source voltage, V = 120 V
The electric power of the heater is given by;
P = IV
Where;
I is the current drawn by the heater
Make I the subject of the formular;
I = P / V
Substitute the given values and solve for the current "I";
I = 1440 / 120
I = 12 A
Therefore, the current drawn by the heater is 12 A.
I just need the answer to number 1 (with work please)
(Newton’s Second Law)
Answer:
wish I could help
Explanation:
I been rereading this and I can't solve it lemme go ask people in ma house real quick
What is the only bone of the skull that moves?
Answer:
Mandible.
Explanation:
The mandible in the bone that allows you to open and close your mouth, otherwise known ad the jawbone.
Answer:
mandible
Explanation:
which is also the lower jaw and it allows the mouth to open and close
hope i helped
A material that reflects or absorbs all the light that strikes it is
A. opaque.
B. transparent.
C. translucent.
D. primary.
Answer:
b. transparent
Explanation:
Photons interact with an object by some combination of reflection, absorption and transmission. Some materials, such as plate glass and clean water, transmit much of the light that falls on them and reflect little of it; such materials are called optically transparent.
Two masses sit at the top of two frictionless inclined planes that have different angles,__deleted9917f34947e1359b5705bbac0d9227f8ec5df862078213a2db19c72f00189109deleted__ 0N86-C1-52-40-A837-22820 50% Part (a) What can be said about the speeds of the two masses at the bottom of their respective paths
Answer:
v = [tex]\sqrt{2gh}[/tex]
the speed in the two planes will be the same since it does not depend on the angle of the same
Explanation:
In this exercise we are told that the two inclined planes have no friction force, so we can apply the conservation of energy for each one, we will assume that the initial height in the two planes is the same
starting point. Highest part of each plane
Em₀ = U = m g h
final point. Lowest part of each plane
[tex]Em_{f}[/tex] = K = ½ m v²
as there is no friction, the mechanical energy is preserved
Em₀ = Em_{f}
mg h = ½ m v²
v = [tex]\sqrt{2gh}[/tex]
As we can see, the speed in the two planes will be the same since it does not depend on the angle of the same
A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s2. How far does the car travel after the driver put on the brakes until it comes to a stop?
Answer:
292 m
Explanation:
Step one:
given data
initial velocity velocity v= 32 m/s
final velocity u= 0 m/s
acceleration a= 3.5m/s^2
Required
The distance covered upon the application of the brake
Step two:
we know that acceleration
a= v-u/t
t= v-u/a
t= (0-32)/3.5
t=32/3.5
t=9.14seconds
also, to find distance, we use s=d/t,
rearrange as d=s*t
d=32*9.14 s
d=292 m
What Initial Velocity would you have to give the Marble to make it hit the ground in 5 s
Answer:
Traveling 381m in 5 seconds means the average velocity is: 381m/5s = 76.2 m/s.
Explanation:
Letting x be the initial velocity and v the final velocity, we have:
12(x+v)=76.2m/s
and (since v=x+50),
12(2x+50)=76.2m/s
x+25=76.2m/s
x=51.2m/s
Answer:
-49 m/s
Explanation:
You would use the formula vf = vi + at, where vf stands for final velocity, vi stands for initial velocity, a stands for acceleration, and t stands for time. Assuming you're dropping the marble on Earth, the acceleration would be -9.8m/s², and the final velocity would be 0 m/s, as it stops after hitting the ground. (0 = vi + (9.8)(5))
