The acceleration with which an object falls through a fluid decreases as the speed of the object increases under gravity, to the point where the speed becomes constant, which is known as the terminal speed of the object
The unknown parameters are the mass of the feather, the density of the air, the feather's projected area and the coefficient of drag
The reason the above selected parameters are the correct unknowns is as follows;
The known parameter;
The speed of the feather the student drops off the building's top = 1.5 m/s
The required parameter;
The unknown parameters
Method;
Determine the terminal velocity parameters of the feather
The terminal velocity, [tex]\mathbf{V_t}[/tex], of an item is the maximum steady speed the item reaches as it falls through a fluid. The terminal velocity of the feather is given by the following equation
[tex]Terminal \ velocity, V_t = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Where;
[tex]\mathbf{V_t}[/tex] = Terminal velocity = The constant speed of the feather
m = Mass of the feather
g = Gravitational acceleration
ρ = Air density
A = The feather's projected area
[tex]C_d[/tex] = Drag coefficient
The average speed of the feather = 1.5 m/s = The feathers typical or most common speed = The terminal velocity of the feather, [tex]\mathbf{V_t}[/tex];
Plugging in [tex]\mathbf{V_t}[/tex] = 1.5 m/s gives;
[tex]V_t = 1.5 \ m/s = \mathbf{\sqrt{\dfrac{2 \cdot m \cdot g}{\rho \cdot A \cdot C_d} }}[/tex]
Therefore, the unknown parameters with regard to the feather falling are the parameters that are to be specified, including;
The mass of the featherThe density of air at the locationThe feather's projected areaThe drag coefficientLearn more about terminal velocity here:
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The elevators in the John Hancock building in Chicago move 783 ft in 33 s. What is this speed in miles per hour?
Answer:
16.18 mph
Explanation:
the speed of elevators =
(783×3600)/(33×5280) =
2,818,800/174,240 = 16.18 mph
How many electrons can carbon accept from other atoms while bonding? (1 point)
two
six
eight
four
Answer: Four electrons
Explanation:
The number of electrons that can be accepted by carbon from other atoms while bonding is four. The correct option is D.
What is chemical bonds?A chemical bond is what holds atoms in molecules together. Electrostatic forces between positively charged atomic nuclei and negatively charged electrons, the positions of which in space are determined by quantum mechanics, generate bonds.
Atoms form chemical bonds to strengthen their outer electron shells. The chemical bonding type maximizes the stability of the atoms that form it.
Carbon forms covalent bonds with other elements or carbon atoms. Carbon compounds are extremely diverse, with sizes ranging from one to thousands of atoms.
Because carbon has four valence electrons, it can form four covalent bonds to achieve a full outer energy level.
Thus, the correct option is D.
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A bullet fired from a pistol travelled 50 metres to the target in 0.08s. What was its speed?
Its speed is 4m/s
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one meter equals how many miles, yards, feet, inches?
Answer:
0.000621 mile
1.094 yards
3 feet 3.37 inches
39.37 inches
Answer:
1m = 0.000621371 miles = 1.09361 yards = 3.28084 feet = 39.3701 inches
A blue train of mass 50 kg moves at 4 m/s toward a green train of 30 kg initially at rest. The trains collide. After the collision the green train moves with a speed of 3 m/s. What is the final speed of the blue train?
an experiment involving the scientific method begins with a/an:
Answer:
Step 1. Make observations.
Step 2. Form a hypothesis.
Step 3. Make a prediction.
Step 4. Perform an experiment.
Step 5. Analyze the results of the experiment.
Step 6. Draw a conclusion.
Step 7. Report your results.
Explanation:
The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.
Our observations tell us about the past or the present. As scientists, we want to be able to predict future events. We must therefore use our ability to reason.
Scientists use their knowledge of past events to develop a general principle or explanation to help predict future events. The general principle is called a hypothesis. The type of reasoning involved is called inductive reasoning (deriving a generalization from specific details).
A hypothesis should have the following characteristics:
• It should be a general principle that holds across space and time
• It should be a tentative idea
• It should agree with available observations
• It should be kept as simple as possible.
• It should be testable and potentially falsifiable. In other words, there should be a
way to show the hypothesis is false; a way to disprove the hypothesis.
Some mammals have two hind limbs would be a useless hypothesis. There is no observation that would not fit this hypothesis!
All mammals have two hind limbs is a good hypothesis. We would look throughout the world at mammals. When we find whales, which have no hind limbs, we would have shown our hypothesis to be false; we have falsified the hypothesis.
When a hypothesis involves a cause-and-effect relationship, we state our hypothesis to indicate there is no effect. A hypothesis, which asserts no effect, is called a null hypothesis. For instance, the drug Celebra does not help relieve rheumatoid arthritis.
what do you mean by acceleration of a body 10\s?
Answer:
it means that the body is moving with acceleration increased of 10m in every second.
9. Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically, what will happen to the liquids ________________?
Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically then the liquid B which has a density of 0.78 g/m would come over the liquid because it is a lighter fluid having less density than the liquid A
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
formula for density
ρ = mass / volume
Liquids A and B have densities of 1.27 and 0.78 grams per milliliter, respectively. The same container receives both of them. If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/m, would emerge on the top because it is a lighter fluid and has less density than liquid A.
Thus, If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/ml, would emerge on the top because it is a lighter fluid and has less density than liquid A.
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3. An electric motor is used to lift a 6.0 kg of mass through a height of 1 metre. The energy it uses is measure on an energy meter is 10 joules.
a) Calculate the work done in lifting the mass
Answer:
Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an important form of stored energy that we will explore in this section.

Figure 1. (a) The work done to lift the weight is stored in the mass-Earth system as gravitational potential energy. (b) As the weight moves downward, this gravitational potential energy is transferred to the cuckoo clock.
Let us calculate the work done in lifting an object of mass m through a height h, such as in Figure 1. If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system. This energy is associated with the state of separation between two objects that attract each other by the gravitational force. For convenience, we refer to this as the PEg gained by the object, recognizing that this is energy stored in the gravitational field of Earth. Why do we use the word “system”? Potential energy is a property of a system rather than of a single object—due to its physical position. An object’s gravitational potential is due to its position relative to the surroundings within the Earth-object system. The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0. We usually choose this point to be Earth’s surface, but this point is arbitrary; what is important is the difference in gravitational potential energy, because this difference is what relates to the work done. The difference in gravitational potential energy of an object (in the Earth-object system) between two rungs of a ladder will be the same for the first two rungs as for the last two rungs.
Converting Between Potential Energy and Kinetic Energy
Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem). We will find it more useful to consider just the conversion of PEg to KE without explicitly considering the intermediate step of work. (See Example 2.) This shortcut makes it is easier to solve problems using energy (if possible) rather than explicitly using forces.
More precisely, we define the change in gravitational potential energy ΔPEg to be ΔPEg = mgh, where, for simplicity, we denote the change in height by h rather than the usual Δh. Note that h is positive when the final height is greater than the initial height, and vice versa. For example, if a 0.500-kg mass hung from a cuckoo clock is raised 1.00 m, then its change in gravitational potential energy is
mgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 Jmgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 J
Note that the units of gravitational potential energy turn out to be joules, the same as for work and other forms of energy. As the clock runs, the mass is lowered. We can think of the mass as gradually giving up its 4.90 J of gravitational potential energy, without directly considering the force of gravity that does the
Question 6.2
Calculate the reading on A2
Answer:
2.25A
Explanation:
that is the answer
write the maximum number of electrons that can be accommodated in the s,p,d,f subshells
Answer:
S=2,P=6,D=10,F=14. The total number of electrons contained by s,p,d,f subshells is 32
ASAP If the initial pressure of a gas is 100 kPa, initial volume is 1.0 L, and final pressure is 25 kPa, what is the final volume?
When no one answers your question...
The final volume is 4.0 liters.
We can calculate the final volume with Boyle's law:
[tex] P_{i}V_{i} = P_{f}V_{f} [/tex] (1)
Where:
[tex] P_{i}[/tex]: is the initial pressure = 100 kPa
[tex] V_{i}[/tex]: is the initial volume = 1.0 L
[tex]P_{f}[/tex]: is the final pressure = 25 kPa
[tex]V_{f}[/tex]: is the final volume =?
Hence, the final volume is:
[tex] V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{100 kPa*1.0 L}{25 kPa} = 4.0 L [/tex]
Therefore, the final volume is 4.0 liters.
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ina drew an animal cell in her science notebook. What’s wrong with the cell?
A.
absence of a cell wall
B.
absence of a nucleoid
C.
presence of chloroplast
D.
presence of a vacuole
Answer:
C) presence of chloroplast
Explanation:
Animal cells have Chloroplast unlike plant cells.
what is the value of acceleration of a body if it is in uniform velocity
Answer:
Zero
Explanation:
The acceleration of body moving with uniform velocity is zero, because there is no change in velocity.
PLEASE HELP ONLY 30 MINS
Answer:
your answer is 0 m/s because the object is in rest
In AC Theory, we are going to add components that will cause use to rely on Trigonometry to evaluate different types of Electrical Power. What three units of power will we be measuring
Answer:

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Home / AC Circuits / Power in AC Circuits

Power in AC Circuits
Electrical power consumed by a resistance in an AC circuit is different to the power consumed by a reactance as reactances do not dissipate energy
  
In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, for AC circuits with reactive components we have to calculate the consumed power differently.
Electrical power is the “rate” at which energy is being consumed in a circuit and as such all electrical and electronic components and devices have a limit to the amount of electrical power that they can safely handle. For example, a 1/4 watt resistor or a 20 watt amplifier.
Electrical power can be time-varying either as a DC quantity or as an AC quantity. The amount of power in a circuit at any instant of time is called the instantaneous power and is given by the well-known relationship of power equals volts times amps (P = V*I). So one watt (which is the rate of expending energy at one joule per second) will be equal to the volt-ampere product of one volt times one ampere.
Then the power absorbed or supplied by a circuit element is the product of the voltage, V across the element, and the current, I flowing through it. So if we had a DC circuit with a resistance of “R” ohms, the power dissipated by the resistor in watts is given by any of the following generalised formulas:
Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group VIA?(1 point)
one covalent bond
two ionic bonds
three metallic bonds
four covalent bonds
Answer:four covalent bonds
Explanation:
It’s right
a car advertisement States that a certain car can accelerate from rest to70km/h in 7seconds find the car's average acceleration
Answer:
Acceleration is 2.78 m/s²
Explanation:
Since the car is from rest, initial velocity, u is zero.
from first newton's equation of motion:
[tex]{ \bf{v = u + at}} \\ [/tex]
v is final velocity
u is initial velocity
a is acceleration
t is time
70 km/h is (70 × 1000 ÷ 3600) m/s = 19.44 m/s
[tex]{ \sf{19.44 = 0 + (a \times 7)}} \\ { \sf{7a = 19.44 }} \\ { \sf{a = 2.78 \: {ms}^{ - 2} }}[/tex]
Jim can ride his bike at 12 meters per second. Bob can ride his bike at 10.5 m/s. If they
are travelling 2.5 miles, how long will Jim have to wait for Bob?
Answer:
just a example
Explanation:
Elena always rides her bicycle at a speed of 15 miles per hour. On Sunday, she goes on a 24 mile bike ride. How many hours does this ride take?
Solution
The speed of 15 miles per hour is a rate. The key words that tell us that this is a rate are "speed" and "miles per hour". We can write:
r = 15
Next, 24 miles is a distance. We have:
d = 24
Now use the d=rt equation to get
24 = 15t
To solve this, divide both sides by 15 to get
t = 24/15
Both are divisible by 3, so this fraction reduces to
t = 8/5 = 1.6
Elena's ride takes 1.6 hours.
estimate my age in seconds 14 years old
The number of flowers on different breeds of bushes in a greenhouse is recorded every week for two months.
Is there a equation or something so I can do the math of how many flowers there are at the end of the two monthsm
A person walks 5,000 cm per day. How many km does that person walk in a year?
Answer:
18.25 km
Explanation:
Convert 5,000 cm to km: 5,000 cm / 10000 = 0.05 km
That person walks 0.05 km per day.
You will get the answer by multiply 365 days (a year): 0.05 km x 365 = 18.25 km
A family goes on a road trip that is 500 km long. It takes the family 2 hours and 30 minutes to complete the trip. What was the family’s speed?
A) 2.17 km/h
B) 200 km/h
C) 1.33 km/h
D) 250 km/h
Answer:
d
Explanation:
30 minutes = 50 km/h * 5 =250km/h
A family goes on a road trip that is 500 km long. It takes the family 2 hours and 30 minutes to complete the trip. then the family’s speed is 200 km/hr. Hence option B is correct.
What is speed ?Speed is a rate of change of distance with respect to time. i.e. v =dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time it is denoted by v and its SI unit is m/s. it is a scalar quantity. i.e. it has only magnitude not direction. ( velocity is a vector quantity, it has both magnitude and direction. when we define velocity, we should know about its direction) Speed shows how much distance can be traveled in unit time. As speed is scalar quantity it has nothing to do with the direction. but when magnitude of speed is given and the direction as well, then we can say that a car or body is moving with this much speed at this direction(east, north, west, south).
Speed = distance/ time
Speed = 500 km/2.5hr
Speed = 200 km/hr
Hence option B is correct.
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plz and I don't know this plz help me
Answer:
Newton
it is derived of mass and displacement
what are gamma rays and what are its uses??
"Gamma rays" is the name that we call the shortest of all electromagnetic waves. They're shorter than radio waves, microwaves, infrared waves, heat waves, visible light waves, ultraviolet waves, and X-rays. They extend all the way down to waves that are as short as the distance across an atom.
Being so short, they carry lots of energy. They can penetrate many materials, and they can damage living cells and DNA. They're dangerous.
The sun puts out a lot of gamma radiation. The atmosphere (air) filters out a lot of it, otherwise there couldn't even be any life on Earth.
As soon as astronauts fly out of the atmosphere, they need a lot of shielding from gamma rays.
You know the precautions we take when we're around X-rays. The same precautions apply around gamma rays, only a lot more so.
It's only in the past several years that we've learned how to MAKE gamma rays without blowing things up. Also, how to control them, and how to use them for medical and industrial applications.
Explanation:
Gamma rays are ionizing electromagnetic radiation, observed by the decay of an atomic nucleus.
Uses of gamma rays :
Sterilize medical requirements. Sterilize food Used as traces in medicine Gamma ray astronomy.a=(v – u)/t
i. V as subject
ii. U as subject
iii. T as subject
Answer:
i.
[tex]a = \frac{(v - u)}{t} \\ v - u = at \\ v = at + u[/tex]
ii.
[tex]a = \frac{(v - u)}{t} \\ v - u = at \\ u = v - at[/tex]
iii.
[tex]a = \frac{(v - u)}{t} \\ ta = v - u \\ t = \frac{(v - u)}{a} [/tex]
I hope I helped you^_^
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
Answer:
The bonds can shift because valence electrons are held loosely and move freely.
Explanation:
Ill put the rest of the answers in the comments
Answer:
The bonds can shift because valence electrons are held loosely and more freely.
The Empire State Building is 1472 ft high. How long would it take an object dropped from the top to reach the ground
Answer:
Explanation:
Givens
a = 32 feet / second
vi = 0
d = 1472 feet
t = ?
Formula
d = vi*t + 1/2 a t^2
Solution
1472 = 0*t + 1/2 * a * t^2 Multiply both sides by 2
2944 = 32 * t^2 Divide by 32
2944/32 = t^2
92 = t^2 Take the square root of both sides
sqrt(t^2) = sqrt(92)
t = 9.59 seconds
The centrifugal force which tends to throw the electrons out it's orbit as stated with mass moving velocity in an orbit of radius is given as what?
Answer:
Mass, velocity, and radius are all related when you calculate centripetal force. ... The equation shows that if you increase mass or speed, you'll need a larger force; if you decrease the radius, you're dividing by a smaller number, so you'll also need a larger force.
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what would happen if measurements such as mass,length,volume,or temperature weren't standardized and everyone made up their own units
Answer:
The world would have been blown up by now.
Explanation:
Hypothetically, lets say that someone gave Kim Jong boi a cup of coffee.
He gets mad at the "public servant" since it didn't contain 3 posafa43asdunds of sugar which makes him "big".
The public servant claims they added jfoaj4su38093 units of sugar, which is equivalent to 3 posafa43asdunds.
He gets mad and launches big cannons at Trump since he blames Boe Jiden.