Questions posted in Physics - AssignmentGrade.com

Questions posted in Physics

Put the pairs of atoms in order, with the pair that has the biggest electronegativity difference between the two atoms at the top of your list. Fluorine and Francium, Phosphorus and lithium, nitrogen and sodium, Chlorine and cesium, nitrogen and sulfur.

Electronegativity is the measure of the tendency of an atom to attract a bonding pair of electrons. In the periodic table, electronegativity increase across the period because the charges on the nucleus increase. The correct arrangement for the atoms given above is as follows
Flourine and Francium
Chlorine and Cesium
Nitrogen and Sodium
Phosphorus and Lithium
Nitrogen and Sulphur.

ANSWERED AT 29/05/2020 - 05:29 PM


QUESTION POSTED AT 29/05/2020 - 05:29 PM

As water vapors rises in the air it cools what is likely to cause

If it helps i would say condensation.

ANSWERED AT 29/05/2020 - 05:28 PM


QUESTION POSTED AT 29/05/2020 - 05:28 PM

20. Consider a model steel bridge that is 1/100 the exact scale of the real bridge that is to be built. a. If the model bridge weighs 50 N, what will the real bridge weigh? b. If the model bridge does not appear to sag under its own weight, is this evidence the real bridge, built exactly to scale, will not appear to sag either?

The model bridge captures all the structural attributes of the real bridge, at a reduced scale.

Part a.
Note that volume is proportional to the cube of length. Therefore the actual bridge will have 100^3 = 10^6 times the mass of the model bridge.

Because the model bridge weighs 50 N, the real bridge weighs
(50 N)*10^6 = 50 MN.

Part b.
The model bridge matches the structural characteristics of the actual bridge.
Therefore the real bridge will not sag either.

ANSWERED AT 29/05/2020 - 05:27 PM


QUESTION POSTED AT 29/05/2020 - 05:27 PM

How do I calculate speed, velocity, and acceleration? I need the formulas too

Speed is the secular unit, which means it only measures "how fast it goes."
speed= \frac{distance}{time}
Velocity is a victory unit, which means it measures "both how fast it goes AND the direction."
velocity= displacement/time
Acceleration is the change of velocity over time. 
acceleration =  \frac{change in velocity}{time}

ANSWERED AT 29/05/2020 - 05:24 PM


QUESTION POSTED AT 29/05/2020 - 05:24 PM

Which of the following statements are true about metallic bonds? A. Metallic bonds hold together atoms with somewhat similar electronegativities. B. Metallic bonds hold together two atoms of two different nonmetals. C. Metallic bonds exist between two atoms of the same element. D. Metallic bonds hold together a water molecule.

The following statement is true about metallic bonds. A metallic bond holds together atoms of similar electronegativities. Essentially this bond consists of a lattice of positively charged ions that are held together by a "sea" of negatively charged electrons. Essentially many electrons are shared by a group of metallic ions. 

ANSWERED AT 29/05/2020 - 05:22 PM


QUESTION POSTED AT 29/05/2020 - 05:22 PM

Please...physics rotation questions

1st Question:
There are 4 formulas involving angular velocity:
For the first question, we are given the initial angular velocity (ωo), final angular velocity (ωf), and the amount of time. The question is asking us to find the angular acceleration (α).
Knowing this information, we can use w=wo+ \alpha t
Lets plug in the values given in the question:
w=wo+ \alpha t
123  \frac{rad}{sec}  = 11  \frac{rad}{sec} + (4.5 sec) \alpha
Now we just solve for  \alpha
123 \frac{rad}{sec} = 11 \frac{rad}{sec} + (4.5 sec) \alpha
Subtract 11 from each side
112 \frac{rad}{sec} = (4.5 sec) \alpha
Divide each side by 4.5 sec. 
 \alpha = 24.89  \frac{rad}{sec^{2} }
----------------------------------------------------------
2nd Question:
For the second question, we want to find the change in distance (which is AKA radians). So we know we would need to use either the 1st, 3rd or the 4th equation. We are given time (t=45 s), the initial velocity (wo=0 rad/s), and the final velocity (w=245 rad/s). Since the 4th equation doesn't have time, and the 3rd equation has angular acceleration (which we weren't given), we know we will need to use the 1st equation. 
theta=wt (in which w is the change in velocity. Which for this case, would be 245-0)
theta=(245 rad/s)(45 s) 
Simplify
theta=11025 rad 

ANSWERED AT 29/05/2020 - 05:18 PM


QUESTION POSTED AT 29/05/2020 - 05:18 PM

A scientist carries out an experiment. How could she help other scientists judge the validity of her results?

One way to do it is she could right down the data that she got

ANSWERED AT 29/05/2020 - 05:13 PM


QUESTION POSTED AT 29/05/2020 - 05:13 PM

Urbanization is the cause of "urban heat island" a condition that could be described as global warming caused by pollutants of a city increase of temperature in a city due to heat absorption of buildings and roads warming of water that is next to a city warming of a city near mountains due to lava under the ground

Urbanization is the cause of "urban heat island" a condition that could be described as an increase of temperature in a city due to heat absorption of buildings and roads. The temperature alteration usually is higher at night than during the day and is most specious when winds are feeble. UHI is most obvious during the summer and winter. The main reason for the urban heat island effect is from the alteration of land surfaces. 

ANSWERED AT 29/05/2020 - 05:09 PM


QUESTION POSTED AT 29/05/2020 - 05:09 PM

A pair of pliers is an example of a simple machine with two levers. Which part of the pliers is the fulcrum?

The part of the pliers that is the fulcrum is the intersection of the two levers. It is what allows the pliers to move together in order to hold objects tightly. A lever is a simple machine that involves of a rigid bar that is connected to a fixed pivot point which is called the fulcrum. Other examples are seesaw and a pair of scissors.

ANSWERED AT 29/05/2020 - 05:08 PM


QUESTION POSTED AT 29/05/2020 - 05:08 PM

"On heating iron ore with carbon we got iron and carbon dioxide" is this synthesis, decomposition, or replacement

It should be a single replacement if the iron ore was an iron oxide (FeO), since the iron in the oxide was replaced by carbon, making CO and leaving iron (Fe) alone.

ANSWERED AT 29/05/2020 - 05:06 PM


QUESTION POSTED AT 29/05/2020 - 05:06 PM

16 to 19 year old male and females are how much more likely to be involved in a crash?

I say around 40% - 60%

https://www.dmv.ca.gov/portal/dmv/detail/teenweb/more_btn6/traffic/traffic
http://www.teendriversource.org/stats/support_teens/detail/57
http://www.rmiia.org/auto/teens/Teen_Driving_Statistics.asp

(I just corrected the question. Sorry if it is still incorrect.)

ANSWERED AT 29/05/2020 - 05:04 PM


QUESTION POSTED AT 29/05/2020 - 05:04 PM

When using repeated trials during a scientific investigation, scientists should find the average of their data for use in their final report. True or False?

Generally speaking, it's a decent choice but not optimal, even sometimes leading to fatal.

Some fatal data should be filtered out before doing any mathematical manipulation, and there are lots of methods to manipulate data, average data sometimes makes no sense.

ANSWERED AT 29/05/2020 - 04:59 PM


QUESTION POSTED AT 29/05/2020 - 04:59 PM

What does it signify if point 2 shifts down and to the left?

It signifies a translation

ANSWERED AT 29/05/2020 - 04:58 PM


QUESTION POSTED AT 29/05/2020 - 04:58 PM

A sound wave is an example of an electromagnetic wave in nature?

No. Sorry. A sound wave is a mechanical wave. There's nothing electromagnetic about it.

ANSWERED AT 29/05/2020 - 04:55 PM


QUESTION POSTED AT 29/05/2020 - 04:55 PM

The compound ethylene (C2H4) is represented by this diagram. What statement best describes the arrangement of the atoms in an ethylene molecule? Each carbon atom shares two electrons with one hydrogen atom and also shares two electrons with the other carbon atom. Each carbon atom shares four electrons with one hydrogen atom and also shares four electrons with the other carbon atom. One electron is shared between each hydrogen atom and the carbon atom bonded to it, and two electrons are shared between the carbon atoms. Two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

Answer: The correct answer is two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

Explanation:

Ethylene is a compound given by the chemical formula H_2C=CH_2.

The bond present between hydrogen and carbon atoms or carbon and carbon atoms are covalent bonds. A covalent bond is formed by the sharing of electrons between the atoms combining.

A double bond is present between carbon and carbon atoms. So 2 pairs of electrons are shared which means in total of 4 electrons are shared.

Bond present between hydrogen and carbon atoms are single bonds. So, a pair of electrons is shared which means that in total of 2 electrons are shared.

Hence, the correct answer is two electrons are shared between each hydrogen atom and the carbon atom bonded to it, and four electrons are shared between the carbon atoms.

ANSWERED AT 29/05/2020 - 04:51 PM


QUESTION POSTED AT 29/05/2020 - 04:51 PM

As the magnetic field increases, which of the following also increases

The answer is AREA .............

ANSWERED AT 29/05/2020 - 04:43 PM


QUESTION POSTED AT 29/05/2020 - 04:43 PM

Society is not affected by an individual's choice to use tobacco products. True or False

I took the test and it was FALSE.

Believe me


ANSWERED AT 29/05/2020 - 04:34 PM


QUESTION POSTED AT 29/05/2020 - 04:34 PM

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Answer: The answer is Doppler effect.

Explanation:

When there is a relative motion between the source and the observer then there will be change in the frequency of the wave. This phenomenon is called Doppler effect.

For example,when the source and the observer are moving each other then the frequency increases in this case. When the source and the observer are moving away from other then the frequency decreases in this case.

Therefore, Doppler effect is the name of the perceived change in a sound wave's frequency due to motion between the observer and the sound source.

ANSWERED AT 29/05/2020 - 04:28 PM


QUESTION POSTED AT 29/05/2020 - 04:28 PM

The ______ of s seismograph moves

The creep meter of a seismograph moves is your correct answer

ANSWERED AT 29/05/2020 - 04:27 PM


QUESTION POSTED AT 29/05/2020 - 04:27 PM

A box that has a weight of 40 N is hung from a spring. The spring constant of the spring is 400 N/m. How many centimeters will the spring stretch? 0.1 cm 1 cm 10 cm 100 cm

The mathematical relationship between force and extension for a spring is F = -kx , where F is the restoring force, k is the spring constant and x is the extension. If a box that weighs 40 N is hung from a spring of content 400 N/m, then the extension is equal to x = -F / k = -400 / 40 = -10 cm. The negative sign simply shows the extension and restoring force are in opposite directions. The answer is 10 cm. 

ANSWERED AT 29/05/2020 - 04:20 PM


QUESTION POSTED AT 29/05/2020 - 04:20 PM

Which of the following is considered a physical environmental hazard? A.Fire B.Lead in water C.Smoking cigarettes D.Being attacked in a dark alley

The answer is A. It says it in Odyssey-ware


ANSWERED AT 29/05/2020 - 04:17 PM


QUESTION POSTED AT 29/05/2020 - 04:17 PM

Some molecular compounds, such as HCl, ionize completely in solution. Some molecular compounds such as HC2H3O2 do not ionize completely when they dissolve in water. Which explains their solution properties?

There are two types of electrolytes: the strong and the weak electrolytes. Strong electrolytes are those which dissociates completely in solutions while weak electrolytes are those that do not. HCl is a strong electrolyte since it is a strong acid while HC2H3O2 is a weak one as it is a weak acid as well. 

ANSWERED AT 29/05/2020 - 04:15 PM


QUESTION POSTED AT 29/05/2020 - 04:15 PM