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  Fatima Ahmed: Hi Yeasin, please send your answer for the Loudspeaker quiz in an email. Check the instructions on the quiz page. I deleted your answer from the comment section for that reason. Let me know if you have any other questions. Thanks.

  • April 23, 2022
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  • March 30, 2022

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  Adam's Brunoise Dice - $5 Physics Quiz

  Adam's Brunoise Dice - $5 physics quiz
   
  
  Adam Petropoulos recently got admitted to the culinary institute named Le Monde in Athens, Greece. His career goal was to become a chef.  He loved food!  He wanted to learn the art of flavor...

  • June 22, 2021

  • Sourav Chowhan likes this.
  • View all 22 comments
  • 
    Khadeeza Afruz Shammee Pascal's principle of pressure describes this knife phenomenon. As a scalar physical quantity ,pressure is defined as the force per unit area applied perpendicular to the surface which it is applied .
    The elementary mathematical expression for pressure...  morePascal's principle of pressure describes this knife phenomenon. As a scalar physical quantity ,pressure is defined as the force per unit area applied perpendicular to the surface which it is applied .
    The elementary mathematical expression for pressure is giving by ,
    P = F/A
    Here, P is the pressure , F is the force acting perpendicular to the surface to which this force is applied and A is the area of the surface .
    The same force applied by a sharp knife with a smaller area of contact will exerts a much greater pressure than a blunt knife having a considerable larger area of contact .
    Once a blunt knife is through the object (vegetable or other food), there is a greater chance for the pressure to lead to slippage, skidding and injury. A sharp knife can cut using the edge of the e knife with a safer slicing. Rather, cuts from sharper knives can actually heal more easily than those from dull knives. A sharp knife is a safer knife than a dull knife.  less

    • June 25, 2021
  • 
    Aria Hossain In physics force=pressure/area. In order to cut food, you have to exert force. According to the equation, force is directly proportional to pressure. A blunt knife has more area around the cutting edge than a sharp knife. So a blunt knife requires more...  moreIn physics force=pressure/area. In order to cut food, you have to exert force. According to the equation, force is directly proportional to pressure. A blunt knife has more area around the cutting edge than a sharp knife. So a blunt knife requires more pressure for the same amount of force to be exerted, as the pressure applied increases the chances of the knife slipping and cutting Adam's hand increases. Similarly, a sharp knife would require less pressure to be applied for the same amount of force to be exerted, this not only allows Adam to cut through the food but also prevents the knife from slipping and cutting his hand.  less

    • June 26, 2021
  • 
    Abdullah Julaybib Firstly, you’ll need more pressure to use a blunt knife.
    P=F/A, for a fixed area, force is directly proportional to pressure. If the
    area of a blunt and a sharp knife is same, then doubling the pressure on blunt
    knife means doubling the force....  moreFirstly, you’ll need more pressure to use a blunt knife.
    P=F/A, for a fixed area, force is directly proportional to pressure. If the
    area of a blunt and a sharp knife is same, then doubling the pressure on blunt
    knife means doubling the force.
    
    Secondly,F= {m(v-u)}/t
    
    Assume, two knives have same mass and you take same amount of time to cut. As
    you start from a zero velocity, that means u=0. Ultimately you end up giving
    much more velocity to the blunt than sharp one. So, if you accidentally slip
    while cutting, blunt will hit your finger faster, which might cause a serious
    injury. Sharp knife will have less velocity, which has multiple advantages:
    bringing the sharp knife to rest is easier than blunt one. If you slip, sharp
    knife won’t hit so fast. It may cause a
    little scratch, or you’ll be lucky to stop the sharp knife as soon as it touches your skin (blunt one
    would cause a deep scar).
    
    
    For same time duration, point of contact (finger and knife)
    faces two different momenta. As a result,...    less

    • June 26, 2021
  • 
    Abhay Sunny Pressure= force/area, area of sharp knife is less than area of blunt knife, p is proportional to 1/area, so pressure of sharp knife is more than blunt knife.Don't get confused with the wight and pressuring, pressure is the force on a unit area that is...  morePressure= force/area, area of sharp knife is less than area of blunt knife, p is proportional to 1/area, so pressure of sharp knife is more than blunt knife.Don't get confused with the wight and pressuring, pressure is the force on a unit area that is help perpendicular whereas weight is the force by which the earth attracts everything towards it's center.  

    • June 27, 2021
  • 
    Abdullah Masud This is simply an example of pressure in our daily lives. Here, according to Pascal's law (P = f/a, where pressure is the force applied over a certain area), the sharp knife can exert greater pressure than the blunt knife, as the sharper knife has less...  moreThis is simply an example of pressure in our daily lives. Here, according to Pascal's law (P = f/a, where pressure is the force applied over a certain area), the sharp knife can exert greater pressure than the blunt knife, as the sharper knife has less contact area for the same force than the blunt knife, so the force would be exerted over a smaller area. So in order to cut anything, one would need to apply a larger force in a blunt knife than a sharper knife, and this might result in the blunt knife cutting the hand due to excessive pressure applied by the user while cutting any other objects.  less

    • June 27, 2021
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  Yeasin Arafath commented on Fatima Ahmed's classified listing.

  

  Mr. Ethan's Dilemma

  Mr. Ethan's Dilemma
   
  
  Mr. Ethan was a senior political leader in a village near the Dhaka District. He also used to be a professor of Dhaka University before his political career. He was highly respected in his village community as he did an...

  • May 11, 2021

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  • 
    Yeasin Arafath As an educated person Mr.Ethan can take some steps to stop spreading covid & to develop
    their village economy. He can use his political purpose in this situation also.
    
    In my point of view some ideas are pointed...  moreAs an educated person Mr.Ethan can take some steps to stop spreading covid & to develop
    their village economy. He can use his political purpose in this situation also.
    
    In my point of view some ideas are pointed below:
    
    1.During lockdown he may arrange online learning & earning programs with younger
    & educated village people.It may help their economic condition.
    
    2.He can make a team or organization with young people those who give free service during pandemic such as
    village women can work in home(hand crafts,sewing etc.) and they can help to delivering these things.
    
    3.From political background he may manage some reliefs from govt. and distribute those with his organization’s young people.
    
    4.He can make schedules for village farmers when they go to their land to cultivate & collect their vagetables and others seeds by maintaining social distance.
    
    5.He and with the help of young people they can arrange market with maintaining social
    distance in the open ground area so that village people can buy...    less

    • May 11, 2021
  • 
    Taarik Hasan As a Mr. Ethan and a professor and a political leader, I
    will use my knowledge from both fields....  moreAs a Mr. Ethan and a professor and a political leader, I
    will use my knowledge from both fields.
    
    
    I will separate the jobs or general people's economic contributions
    into three categories: highest, the less, and the least. The main objective is
    to keep the economy after reducing the interaction of people.
    
    
    I will set the time frame for various categories. Before the
    office hours on the very morning, the markets will be available for estern
    housing (in the evening, the western people will come).
    
    
    With the office hours, the banks and other related services
    will be there. In the evening time, the least contributors will come across
    like shopping complexes and restaurants.
    
    
    At night the manufacturers and agriculture, food services, garments,
    suppliers will work.
    
    
    
    
    
    The statistics on the economic contribution I will follow to
    set them at morning, day, or night shifts, related with one another.
    
    
    
    
    
    People must not leave houses for roaming will be ensured by
    political campaigns and creating...    less

    • May 12, 2021
  • 
    Towhidur R. To combat against covid-19 nothing beats social distancing, closing the borders, and nationwide lockdown. But to reduce the economic backlash certain steps can be taken.
    Distribution of workforce could ensure less gathering and reduction of service....  moreTo combat against covid-19 nothing beats social distancing, closing the borders, and nationwide lockdown. But to reduce the economic backlash certain steps can be taken.
    Distribution of workforce could ensure less gathering and reduction of service. Businesses will divide the workers into shifts and follow strict guidelines. They will also have to reduce the services they provide and stay open for extra hours. Garments, constructions need to divide their workforce into shifts so it doesn't hinder their work.
    Long journeys should be restricted as it increased the chances of spreading the virus. Borders need to stay closed at all costs because new strains are being discovered on a regular basis around the globe and the effects of the mutated virus could be devastating.
    Law force should be deployed to monitor unnecessary gatherings and ensure people maintaining the guidelines in public.
    The government needs to organize relief funds to ensure infected individuals don't have to go hungry or forced to go...    less

    • May 12, 2021
  • 
    Khadeeza Afruz Shammee Although the duration and severity of Covid-19 are terrible, it is quite impossible for a country like Bangladesh, to have a long lockdown to sustain the economy. As a policymaker, I will take the following steps :
    - I will instruct the industries to...  moreAlthough the duration and severity of Covid-19 are terrible, it is quite impossible for a country like Bangladesh, to have a long lockdown to sustain the economy. As a policymaker, I will take the following steps :
    - I will instruct the industries to work by dividing the working time into double shifts. In this way, even if the cost of running the industry is a bit higher, the density in the workplace can be avoided.
    -Since the marketplaces must be kept open, a family member from each family will be provided a movement pass for shopping at most one day of the week to avoid extra crowds.
    -Adequate number of transports would be kept running on the occasion of the upcoming festival so that the passengers can maintain minimum social distance.
    -Strict surveillance will be put in place to ensure that people are maintaining proper social distance and hygiene and not leaving their house unnecessarily. Public awareness activities should be carried out to motivate the people to abide by the necessary health norms.  less

    • May 13, 2021
  • 
    Fatima Ahmed Thank you for all your answers everybody. We will announce the winner of this quiz tomorrow.

    • May 14, 2021
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