The on-line Manual tells you to gravity filter your lichens with a plug of cotton in the neck of your funnel and drying agent in your filter paper. Why

Answers

Answer 1

When drying Hichner stains, the online manual advises gravity filtration, using a cotton plug in the neck of a funnel and a drying agent in filter paper. Acetone is hygroscopic and may contain up to 19% water, which can interfere with the staining process.

Furthermore, using a drying agent with the cotton plug will ensure that the Hichner stain is dried completely. This technique is also used to remove any small trace amounts of debris that may interfere with the staining process.
Gravity filtration is a common technique used in chemistry labs to remove solid impurities from a liquid. It works by using gravity to pull the liquid through a filter. The solid particles are left behind in the filter, while the pure liquid passes through.
The use of a cotton plug in the neck of the funnel is to prevent any solid particles or impurities from entering the filter paper and thus the filtrate. The filter paper also serves as a drying agent, which ensures that the Hickner stain is completely dried.  Acetone is a commonly used solvent in staining techniques, but it is hygroscopic, meaning it can absorb water from the atmosphere. This can affect the staining process by interfering with the chemical reaction between the stain and the sample. Therefore, it is important to ensure that the acetone used is completely dry and free from any water content.  In conclusion, using gravity filtration with a cotton plug and drying agent in the filter paper is an effective way to dry Hichner stains. This technique ensures that the stain is completely dried and free from any debris or impurities that could interfere with the staining process. Using dry acetone is also important to ensure accurate results.

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complete question:

The on-line Manual Telis you to gravity hiller your lichens with a plug of cotton in the neck of your funnel and drying agent in your filter paper. Why?

Acetone is hygroscopic

Acetone could have as much a 19 water

To catch amy small t trims immaterial

to dry the Hikers


Related Questions

please help me. ill give you brainliest if you help me (please only answer if you have the right one)

please help me. ill give you brainliest if you help me (please only answer if you have the right one)

Answers

Answer:410.022779

Explanation: To figure out force, you use the equation F=MA. Well, in this case, you're trying to find M. The mass. All you have to do is rearrange. F=MA turns into A=F/M.

Ice (the solid phase of water) has a lower density than water because:

Answers

Extra hydrogen bonds occur when water freezes and increases the space between molecules. In addition, it causes a decreasing density overall.

Hope im correct
Everything is condensed.

Suppose that during a test drive of two cars, one car travels 234 miles in the same time that a second car travels 180 miles. If the speed of the first car is 12 miles per hour faster than the speed of the second car, find the speed of both cars.

The speed of the first car is _____ mph. (Simplify your answer.)

The speed of the second car is _____ mph. (Simplify your answer)

Answers

The speed of the first car is 52 mph.

The speed of the second car is 40 mph.

Let's use "x" mph to represent the second car's speed. We can express the first car's speed as "x + 12" mph because it is 12 mph faster. According to our knowledge, the first car travelled 234 miles, while the second car covered 180 miles.

The relationship between speed and distance travelled is inversely proportional. As a result, the proportion of distances covered by the two vehicles will match the proportion of their speeds:

234 / 180 = (x + 12) / x

To solve this equation, we can cross-multiply:

234x = 180(x + 12)

Expanding the equation:

234x = 180x + 2160

Rearranging terms:

234x - 180x = 2160

54x = 2160

Dividing both sides by 54:

x = 40

Therefore, the speed of the second car is 40 mph.

To find the speed of the first car, we can substitute the value of x back into the expression "x + 12":

x + 12 = 40 + 12 = 52

Hence, the speed of the first car is 52 mph.

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Physical precipitation of gypsum due to evaporation of seawater produces which kind of sedimentary rock?
A. biochemical
B. chemical
C. clastic
D. organic

Answers

Physical precipitation of gypsum due to the evaporation of seawater produces a chemical kind of sedimentary rock.

What is evaporation?

In contrast to the condenser, the evaporator absorbs heat from the compartment's air while converting refrigerant liquid to gas. Due to the reduced pressure and heat dissipation, the liquid refrigerant is much cooler than the fan air surrounding it when it reaches the evaporator.

Evaporites - shaped through evaporation of seawater or lake water. Produces halite (salt) and gypsum deposits through chemical precipitation because the awareness of solids will increase because of water loss through evaporation.

Evaporite rocks form when seawater or lake water dries up and precipitates gypsum (CaSO4·2H2O), halite (NaCl), or other minerals. Evaporites are chemical sedimentary rocks.

Precipitation of gypsum due to evaporation of seawater is a chemical type of sedimentary rock. The category is called evaporite, which forms after seawater dries.

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Hi I need help with this question (see image ). Please show workings. If necessary.​

Hi I need help with this question (see image ). Please show workings. If necessary.

Answers

Answer:

Answer

Advantages of alcohol over Mercury

(a) Freezing point of alcohol is −117∘

C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below −80∘

C which cannot be measured by mercury thermometer because mercury freezes at−39 ∘ C

(b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and hence is more sensitive

(c) it can be coloured brightly by adding some dye in it and hence is easily detectable

The force F between two parallel wires carrying electric currents is inversely proportional to the distance d between the wires. If a force of 0.750 N exists between wires that are 1.75 cm apart, what is the force between them if they are separated by 2.50 cm?

Answers

the force between the two wires if they are separated by 2.50 cm is 0.525 N.

Given that force F between two parallel wires carrying electric currents is inversely proportional to the distance d between the wires and that a force of 0.750 N exists between wires that are 1.75 cm apart and that we are supposed to find the force between them if they are separated by 2.50 cm.

Let the initial force be F₁ and the initial distance be d₁.

Therefore, we can write the relationship between force and distance as;

F₁d₁ = F₂d₂

Where

;F₁ = 0.750 N (initial force)

d₁ = 1.75 cm (initial distance)

F₂ = ? (force at new distance)

d₂ = 2.50 cm (new distance)

Let us find F₂;F₁d₁ = F₂d₂F₂ = F₁d₁/d₂

Now substitute the values we know;

F₂ = (0.750 N x 1.75 cm) / 2.50 cmF₂ = 0.525 N

Therefore, the force between the two wires if they are separated by 2.50 cm is 0.525 N.

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It takes a physics student 3hrs to travel Toronto to Waterloo at the rate of 96 km/h then takes her 2 hrs to travel back what was the speed on her way back

Answers

Answer: 144 km/h

Explanation:

The distance between Toronto and Waterloo is 288 km. The student traveled from Toronto to Waterloo at a speed of 96 km/h, so the total distance traveled is 288 km (96 * 3). The student traveled back from Waterloo to Toronto in 2 hours, so the average speed on the way back is 144 km/h (288 / 2).

However, we cannot know the exact speed on the way back without knowing the student's exact route. If the student took the same route on the way back, then the average speed is 144 km/h. However, if the student took a different route on the way back, then the average speed could be different. For example, if the student took a more direct route on the way back, then the average speed could be higher. If the student took a more scenic route on the way back, then the average speed could be lower.

Therefore, the best answer to the question is that the average speed on the way back is 144 km/h assuming the student took the same route back.

Find the distance an object traveled if a force of 350 n acted on it to produce 0 work?

Answers

Force(F) = 350 N

Work (W)= 0 J

Apply the formula:

Work = Force x Distance

Isolate distance(d)

Distance = Work/ Force

d = W/F = 0 /350 = 0 m

The distance that the object traveled is 0 (zero)

What are the 5 main functions of the circulatory system?.

Answers

The five main functions of the circulatory system are to carry oxygen and nutrients to cells, remove waste from cells, regulate body temperature, fight infections, Protection against infection and disease and Maintenance of blood pressure and volume.

The first function of the circulatory system is to transport oxygen and nutrients to cells. The second function of the circulatory system is to remove waste from cells. Blood carries away waste products such as carbon dioxide, lactic acid, and urea. The third function of the circulatory system is to regulate body temperature. Blood vessels act as a medium to transport heat. The fourth function circulatory system plays an important role in protecting the body from infection and disease. The circulatory system is an integral part of the human body that is responsible for transporting nutrients, oxygen, and hormones.

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Why is gravity acting on a falling rock to the ground considered an unbalanced force?.

Answers

The book starts to fall towards the earth and accelerates as gravity takes over. The forces are viewed as being out of balance in this scenario. The fact that there is a net force acting on the book makes it move because there is one.

Why is there gravity?

You are drawn toward the ground by gravity because all mass-bearing things, such as the Earth, actually bend and distort spacetime, the fundamental fabric of the cosmos. You experience gravity because of that curvature.

Why is gravity so ineffective?

According to string theory, the universe must include at least four additional spatial dimensions in addition to the three that we can now perceive. The best predictions of string theory are that, unlike other forces, it seeps into and out of these extra dimensions.

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how much kinetic energy does a 50 kg object have if its moving at a velocity of 1 m/s

Answers

Answer:

25 J

Explanation:

KE = 1/2mv² = 1/2(50 kg)(1 m/s)² = 25 J

Which element is a metalloid? selenium (Se) polonium (Po) phosphorus (P) iodine (I)

Answers

Answer:

Polonium(Po)

Explanation:

Answer:

B. polonium (Po)

Explanation:

i took the test

Will mark the brainliest
When a car of mass 1000kg is travelling along a level road at a steady speed of 20ms −1
its engine is working at 18kW.
Resultant force = 900N Braking Force = 3100N Gravity = 9.81
By how much does this change if the car is travelling down the same hill at 20ms −1 ?

Answers

Answer:

OK draw a diagram - you have the force from (b) acting sown the slope and a component of the weight. Use F=ma to get the deceleration and then use SUVAT. Post your working if this doesn't work.

friction = 900N

braking = 3100N

total = 4000N

w= mxg = 1000*9.81= 9810N

total = 9810 + 4000 = 13810N

force/mass = 13810/1000 = 13.81ms^-2

then using v^2 = u^2 + 2as, i get s as 14 but it is incorrect

Explanation:

Power is measured in
A) amps
B) volts
C) ohms
D) siemens/cm
E) watts

Answers

The Power is measured in E) watts. In electrical systems, power (P) represents the rate at which electrical energy is converted to another form, such as mechanical or thermal energy. The unit for power is the watt (W), named after the Scottish engineer James Watt.



To calculate electrical power, you can use the formula P = V * I where P represents power in watts, V is the voltage (in volts), and I is the current in amperes or amps. By knowing the voltage and current in a circuit, you can determine the power being consumed or generated. The other options in your question represent different electrical quantities A) amps - Amperes (A) are the units for measuring electric current. B) volts - Volts (V) are the units for measuring electric potential difference or voltage. C) ohms - Ohms (Ω) are the units for measuring electrical resistance. D) siemens/cm - Siemens per centimeter (S/cm) is a unit for measuring electrical conductivity. To summarize, power in electrical systems is measured in watts (W), which is the rate of converting electrical energy into other forms.

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Where are streams located?

Answers

Answer:

Larger seasonal streams are more common in dry areas. Rain-dependent streams (ephemeral) flow only after precipitation. Runoff from rainfall is the primary source of water for these streams. Like seasonal streams, they can be found anywhere but are most prevalent in arid areas.

Explanation:

A + 10 nC charge is located at the origin.

part A: What is the strength of the electric field at the position (x,y)=(5.0cm,0cm)?

Part B: What is the strength of the electric field at the position (x,y)=(−5.0cm,5.0cm)?

Part C: What is the strength of the electric field at the position (x,y)=(−5.0cm,−5.0cm)?

Answers

A)The strength of the electric field at the position (x,y)=(5.0cm,0cm) is \(3.6*10^{4}\) N/C

B)The strength of the electric field at the position (x,y)=(−5.0cm,5.0cm) is \(1.78*10^4\) N/C

C) The strength of the electric field at the position (x,y)=(−5.0cm,−5.0cm) is \(1.78*10^4\) N/C

A)To determine the field strength at point A where (x,y)=(5.0cm,0.0cm),

notice that the distance from A to the origin is simply 5.0 units along the y-axis.

\(E=1/4\pi e_{o}*\frac{Q}{r^{2}}\)

\(E=9*10^{9}*\frac{10*10^{-9}}{{5*10^{-2}}^{2}}\)

\(E=3.6*10^{4}\)N/C

B)To determine the field strength at point A where (x,y)=(-5.0cm,5.0cm),

use Pythagoras theorem,

\(r=\sqrt{5^2+5^2} \\r=7.1cm\)

\(E=1/4\pi e_{o}*\frac{Q}{r^{2}}\)

\(E=9*10^{9}*\frac{10*10^{-9}}{{7.1*10^{-2}}^{2}}\)

\(E=1.78*10^4\) N/C

C)To determine the field strength at point A where (x,y)=(-5.0cm,-5.0cm),

use Pythagoras theorem,

\(r=\sqrt{5^2+5^2} \\r=7.1cm\)

\(E=1/4\pi e_{o}*\frac{Q}{r^{2}}\)

\(E=9*10^{9}*\frac{10*10^{-9}}{{7.1*10^{-2}}^{2}}\)

\(E=1.78*10^4\) N/C

What is electric field strength?

Electric field strength is a quantitative expression of the intensity of an electric field at a particular location. The standard unit is the volt per meter (V/m or V·m-1). A field strength of 1 V/m represents a potential difference of 1 V between points separated by 1 meter.

How to measure electric field strength?

F=(k·Q·q)/d2

In this case, F again represents force, k equals the coulomb constant, Q refers to the source charge (in coulombs), q is the test charge (in coulombs) and d is the distance between Q and q.

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Which characteristic is present in a planet but not in a dwarf planet? A spherical shape. An orbit around the sun. An orbit cleared of other objects. A potato-like shape.​

Answers

Answer: An orbit cleared of other objects.

There are three basic characteristics that a planet must have. Dwarf planets have two of these characteristics: an orbit and a spherical shape. However, dwarf planet orbits are not cleared of other objects like the orbits of planets.

A student conducted a scientific investigation on the magnetic properties of iron. She used a magnet to try to pick up
iron nails
After making several observations, which question can she answer?
O Which part of a magnet is strongest at attracting iron?
O How fast does iron lose its magnetism?
O What is the importance of studying the magnetic field of a magnet?
How does the color of iron change with exposure to air?
Mark this and return
Save and Exit
RE
S

Answers

Answer:

she can answer : which part of the magnet is said strongest at attracting iron & how fast does iron lose its magnetism?

Choose the friction which opposes the relative motion between surfaces in motion a.Static friction b.Kinetic friction c.Sliding friction d.Both kinetic and sliding friction

Answers

Answer:

d. Both kinetic and sliding friction

Explanation:

Kinetic friction, commonly known as sliding friction, happens when a body with its surfaces in contact is in relative motion with another. It's the frictional force slowing it down, and finally stopping a moving body. One can describe sliding friction as the resistance any two objects create while sliding against each other. It is often documented as the force required to hold a surface moving along another surface. It is determined by two variables- one is material of the object and another is its weight.

Which type of wires (copper, aluminum, or string) are ferromagnetic metals?

Answers

Answer:

Copper isn't ferromagnetic,

Aluminum isn't ferromagnetic,

String has a ferromagnetic property

So in conclusion:

The answer is strings :)

when a capacitors voltage decreases to ΔVC, current decreases to what?

Answers

When a capacitor's voltage decreases to ΔVC, the current decreases to zero.

A capacitor stores electrical charge and releases it when connected to a circuit. Initially, when a capacitor is fully charged, it holds a certain voltage across its plates. As the voltage across the capacitor decreases, the stored charge is gradually released. As a result, the current flowing through the capacitor decreases.

When the voltage across the capacitor drops to ΔVC, it means that the voltage difference between its plates has decreased by ΔVC. At this point, the capacitor has discharged completely, and no more charge is flowing through it, resulting in zero current.

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suppose you have two socks sticking together in the clothes dryer from static electrity. what happens if they are spun gently?

Answers

As the two socks are being spun too slowly, they are probably not going to stick together since the static charge would be too small to cause them to adhere.  

An imbalance in the charged particles of the thing is what causes static electricity, according to this definition. Until they are released or discharged, these charges remain on the object's surface. Static electricity is produced at the surface of the object as a result of these charges.

When a dryer's electricity supply is turned on, clothing spin faster and become stuck to one another, creating friction force between them. When the supply gets off, the spinner stopped its movement and the result is the static electricity that causes the socks to stuck together.

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A force of 1000N acts to stop a 1000kg car moving at 20m/s. How much time does it take the car to stop?

Answers

Answer:

Explanation:

How much force does a 1000kg car need to accelerate at 3m s2 to the south?

Answer- the force needed to accelerate the 1000kg car by 3m/s2 is 3000N.

why is saturn almost as large in radius as jupiter despite its smaller mass?

Answers

Answer:

Saturn is almost as big as Jupiter despite its smaller mass because Jupiter is a more dense gas giant than Saturn.

Explanation:

how will the pandemic change our life? ​

Answers

It will change the way we do normal things such as going to certain stores, have arrows showing what lane you can go down, not being able to leave the country for awhile, and social interaction
the way we do things we can’t
go out as much or hang with a lot of people

The amount of energy involved in melting a substance without changing its temperature is called the:
A) heat of vaporization.
B) calorie.
C) joule.
D) heat of fusion.
E) heat of combustion.

Answers

The amount of energy involved in melting a substance without changing its temperature is called the heat of fusion (D).

What is the heat of fusion?

Heat of fusion refers to the amount of heat energy required to melt or freeze a unit mass or a quantity of a substance. Heat of fusion is expressed in joules per gram (J/g) or in calories per gram (cal/g). The amount of energy needed to melt a solid substance into a liquid state at a constant temperature is the heat of fusion. The temperature of a substance remains constant during the melting process because the energy being added is used to break the intermolecular bonds between the molecules of the substance.

Hence, the correct answer is Option D.

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In a collision, the human body will strike the seatbelt, steering wheel, dash or windshield at? Group of answer choices only 10 to 15 miles per hour the same speed as the vehicle twice the speed of the vehicle one half the speed of the vehicle

Answers

Answer:

isn't this kinda like math

Explanation:

In a collision, the human body will strike the seatbelt, steering wheel, dash, or windshield at the same speed as the vehicle.

A collision is when one object comes in contact with another, leading to an abrupt and forceful impact. This means that a collision happens when one object hits another surface or object with an extreme impact that causes injuries or damages.

There are three theories of collision, among which the "human collision" is the second theory. In this theory, the impact of a collision between the human body and the external surface happens after the collision occurs. But the force of the impact remains the same, meaning the force with which the body hits the other surface is at the same speed as the vehicle prior to the collision. This is because while the collision may have occurred, the body is still moving at the same speed as the vehicle, thereby resulting in the same speed of the vehicle as that of the force of impact. So, the human body will strike the external or opposite surface at the speed of the vehicle.

Prior to a collision, the body inside the vehicle is moving at the speed of the vehicle. So, when a collision occurs, the body continues to move with that speed even though the vehicle may have halted. Thus, the human body will strike at the same speed as the vehicle.  

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In a collision, the human body will strike the seatbelt, steering wheel, dash or windshield at? Group

2). (2%) A 2-kg block is attached to a spring whose constant is 32 N/m horizontally. Imagine it is displaced from its equilibrium by 0.04 m and released from rest. What is the position at the following times: t=0 s, t=rts, t=2rt s. Write the velocity and acceleration functions at any given time.

Answers

The acceleration function can be found by taking the second derivative of the position function, which is a(t) = -2.56cos(8t). This is a simple harmonic motion with amplitude of 0.04m and a period of T=pi/4s.

At t=0 s, the block will be at its maximum displacement from equilibrium, 0.04 m to the right. At t=rts, where r is the square root of the ratio of the mass to the spring constant, the block will pass through the equilibrium position and continue to oscillate back and forth. At t=2rt s, the block will be back at its maximum displacement, 0.04 m to the left.

The velocity function can be found by taking the derivative of the position function, which is x(t) = 0.04cos(8t). The velocity function is therefore v(t) = -0.32sin(8t).

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pls help asap. will mark as brainliest if correct

pls help asap. will mark as brainliest if correct

Answers

Answer:

Hey mate, here is your answer answer. Hope it helps you

Explanation:

1. If a worker has come into contact with electricity the worker may not be able to remove themselves from the electrical source. The human body is a good conductor of electricity. If you touch a person while they are in contact with the electrical source, the electricity will flow through your body causing electrical shock. Firstly attempt to turn off the source of the electricity (disconnect). If the electrical source can not readily and safely be turned off, use a non-conducting object, such as a fibreglass object or a wooden pole, to remove the person from the electrical source.

2. C- Electrical energy.The term electrical activity means that the food itself has the power to generate electric energy that persists some period of time. This work presents a purely renewable energy as energy comes. the zinc reacts with food tissue.

Number2 is a chemical energy

Four particles are positioned on the rim of a circle. The charges on the particles are 10.500 mC, 11.50 mC, 21.00 mC, and 20.500 mC. If the electric potential at the center of the circle due to the 10.500 mC charge alone is 4.50 3 104 V, what is the total electric potential

Answers

The total electric potential will be 4.50 ×10⁴ V. The potential difference is the difference in electric potential between two charged substances.

What is the electrical potential difference?

The amount of work performed in an electrical field to move a unit charge from one location to another is defined as the electrical potential difference.

The distance between all charges and the center is the same. The 10,500 mC, 11.50 mC, 21.00 mC, and 20,500 mC charges neglect each other's potentials.

Hence, the total electric potential will be 4.50 ×10⁴ V.

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Identify which details are most important or less important for an objective summary of the excerpt. which of the following definitions is incorrect? which of the following definitions is incorrect? inapparent: infection characteristic of a carrier state primary infection: an initial illness chronic: a disease that develops slowly and lasts for months acute: a short-lasting primary infection secondary infection: a long-lasting illness an 18 foot ladder rests against molding at the top of 15 feet building. what is the angle of elevation from the ground to the top of the ladder? Round to the nearest degree. The angle of elevation is ____ how to find Concentration (in g solute/100 g solvent) of solute in solution when all solids dissolve. Consider the following array of int values. [22, 11, 34, -5, 3, 40, 9, 16, 6] (a) write the contents of the array after 3 passes of the outermost loop of bubble sort. (b) write the contents of the array after 5 passes of the outermost loop of insertion sort. (c) write the contents of the array after 4 passes of the outermost loop of selection sort What is the value of x in the equation 4 24? The stages of imalostif If alk most like those of: A) meiosis I 8) interphase C) mitosis D) raitosis 11 Just C and D using index notation A proper cool-downO increases the heart-rateO makes muscles coldO helps prevent fainting or dizzinessnone are correct You're 6.0 m from one wall of a house. You want to toss a ball to your friend who is 6.0 m from the opposite wall. The throw and catch each occur .0 m above the ground. Assume the overhang of the roof is negligible, so that you may assume the edge of the roof is 6.0 m from you and 6.0 m from your friend. What minimum speed will allow the ball to clear the roof? helpp me pleass ............. In one experiment, you measured the potential difference across a resistor as a capacitor discharged through it. You then plotted the natural logarithm of the voltage vs time (in seconds), and from the equation of the best fit line you measured the time constant of the RC circuit. If the equation of that line is ln open vertical bar V close vertical bar equals negative 0.027 t plus 2.5 , what is the time constant of the circuit? the sun causes a greenhouse effect on earth. how is earth impacted by the greenhouse effect?(1 point) what is the inverse of y=log(x-2) walking in the winter wonderland here comes ________right down Santa claus lane What is the main idea of judicial review? A record has an angular speed of 47 rev/min. What is its angular speed? Answer in units of rad/s.b) Through what angle does it rotate in 1.07 s? Answer in units of rad Help if you can please help with 3 and 4 please What is "Engineering"? Explain the significance of 3 primary similes or metaphors from Langston Hughes' poem "Harlem." Consider themes connected to the pursuit of dreams and the race/ethnicity cultural lens. (Respond with 8-10 sentences of textual analysis, citing and fully explaining direct quotes from the poem to support your response. Cite your quotes with the author's last name and poem line number).