For a Wall of a given material and of a fixed surface area, the rate of heat loss by condition through the wall is inversely proportional to the thickness (T) of the wall, and directly proportional to the temperature difference (d) across the wall. The rate of heat loss could be given by which of the following expressions?
A. 2d/T
B. 2T/d
C. 2d+1/2T
D. 2(d+1/2T)
E. T/d
সঠিক উত্তরঃ
A.
2d/T
Explanation:
Related Questions (Any University/Year)
- টি টুয়েন্টি ক্রিকেটে ষোলটি দল নক আউট পদ্ধতিতে ফাইনাল পর্যন্ত খেললে মোট কয়টি ম্যাচ অনুষ্ঠিত হবে ?
- In a pickup van, in addition to 50 hens, there are 45 goats and 8 camels with some keepers. If the total number of their feet be 224 more than the number of their heads in the van, find out the number of keepers in the van.
- A container holds 40 gallons which is 80% water and 20% acid. How much of the water must be evaporated to produce a solution containing 50% acid?
- Ratio between two numbers is 2:3 and their sum is 400. The greater of the two number is
- Three valves, when opened individually, can drain the water from a certain tank in 3, 4 and 5 minutes respectively. What is the greatest part of the tank that can be drained in one minute by opening just two of valves?
- ঢাকা-আরিচা বাসে প্রথম 4 কিমি ভ্রমনের ভাড়া 10.00 টাকা, পরবর্তী 20 কিমি পর্যন্ত প্রতি কিলোমিটারের ভাড়া ৯০ পয়সা এবং পরবর্তী প্রতি কিলোমিটারের ভাড়া 70 পয়সা। 25 কিমি দূরত্বে ভ্রমনের ভাড়া কত?
- টাকায় ৩.টি.করে. আম কিনে টাকায় ২ টি করে বিক্রি করলে শতকরা কত লাত বা ক্ষতি হয়
- একটি পাত্রে পানি ও সিরাপ ৩ঃ ৫ অনুপাতে মিশ্রিত রয়েছে । কতটুকু মিশ্রণ উঠিয়ে নিয়ে তার পরিবরর্ত পানি যুক্ত করলে তরল দুটির অনুপান ৫০ঃ৫০ হবে?
- . If X4 = 81 and Y2 = 49, then maximum possible value for Y-X is
- In the figure above area of the inscribed rectangle is 32. The circumference of the circle is-
- The average of eight numbers is 14 and the average of six of those numbers is 16. What is the average of the remaining two numbers?
- One laptop seller is planning to increase the price/laptop by BDT 10,000 from the next month. Market research shows that with this increase in price he will be able to sell 6 fewer laptops in the next month but the total revenue will increase by BDT 32,000 to BDT 760,000. What is the number of laptops the seller will sell in the next month at this new price?
- A nut mixture consists of peanuts, pistachios, and macadamia nuts in the ratio 5:3:2, respectively, by weight. What amount of pistachios will be in 40 pounds of the mixture?
- Six years ago Anita was P times as old as Ben. Anita is now 17. How old is Ben now in terms of p?
- The electric company charge: Tk 0.3 per KWH. Rahim used 2800 KWH in April, 3200 KWH in May, and 3600 KWH in June. What was his average costs of electricity in taka for the 3 months?
- When x is divided by 7, the remainder is 6.Which of the following must be an even number ?
- A train running at the speed of 60 km/hr crosses a pole in 9 seconds, what is the length of the train?
- একটি ঝুড়িতে আপেল এবং কমলা মিলিয়ে ৭০ টি ফল আছে। প্রতিটি আপেল এবং কমলা ১৯ টাকা দরে কেনা হয়েছে । সবগুলো ফল কিনতে যদি ১৩৩০ টাকা খরচ হয় এবং আপেল এর চাইতে চারটি কমলা কম থাকে। তবে ঝুড়িতে কয়টি আপেল ছিল?
- The ratio of girls to boys in a class is 8:7. The number of students in the class could be any of the following except
- একটি সংখ্যা ৩৩ থেকে যত ছোট, ২১ অপেক্ষা তার দ্বিগুণ বড়। সংখ্যাটি কত?
- In Jiimiary, 55 percent of a hospital's 300 patients were women. In February, 30 percent of its 440 patients were women. What was the percent change in the number of women patients from January to February?
- An amount of money is to be distributed among P, Q and R in the ratio of 6:19:7 respectively. If R gives Tk. 200 of his share to Q. the ratio among P, Q and R becomes 3:10:3 respectively. What was the total amount in taka?
- In takes one machine 4 hours to complete a production order and another machine 3 hours to complete the same order. How many hours would it take when both machines complete the order simultaneowsly at their respective rates?
- The length of each side of square A is increased by 100 percent to make square B. Again the length of each side of square B is increased by 50 percent to make square C. By what percent is the area of square C greater than the sum of the areas of square A and B?
- You can now purchase 5 more bananes with tk. 75 due to a reduction in price by 20% Calculate the current price of one dozen of bananas
- Which of the following is equal to 85 percent of 160?
- When positive integer x is divided by positive integer y, the remainder is 9. If x/y = 96.12, what is the value of y?
- the average age of a group of person going for a picnic is 16 years. twenty new person with the average age of 15 years joined the group on the spot. Due to that, the average age of the group became 15.5 years. what is the number of persons initially going for the picnic.
- A sum of money is divided among 3 persons in the ratio 4:6: 9 .If the largest share is tk 1000 more than the smallest share ,what's ithe total sum
- সরলরেখার কোন বিন্দুতে অংকিত ২টি কোনের অনুপাত ৭ঃ২ হলে ক্ষুদ্রতম কোণের পরিমাপ কত?
- A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is:
- A And B can run 200m in 22 and 25 seconds respectively. How far is B from the finishing line when A reaches it?
- সম্পূর্ণ খালি একটি চৌবাচ্চা একটি পাইপ দিয়ে ৫ ঘণ্টায় সম্পূর্ণ ভর্তি করা হয়। দ্বিতীয় একটি পাইপ দিয়ে চৌবাচ্চাটি পূর্ণ করতে ৩ ঘণ্টা সময় লাগে। দুটি পাইপ একসাথে ব্যবহার করে চৌবাচ্চাটি ২৩ অংশ পূর্ণ করতে কত সময় লাগবে?
- After paying a 10 percent tax on all income over $3,000, a person had a net income of $12,000. What was the income before taxes?
- A bus use one gallon of petrol to travel 15 km. After a tune- up ,the bus travels 15% farther on one gallon .How many gallon of petrol will it take or the bus to travel 150km after tune up?
- Two planes leave the same airport at 1:00 pm. How many miles apart will they be at 3.00 pm if one travels directly north at 150 mph and other travels directly west at 200 mph?
- A bookstore lists a novel at such a price that after giving a discount of 30% on the listed price (including tax) it earns a profit of 40%. If enlisted price of the novel including tax is Tk. 460, then what is the cost price of the novel?
- A 112-meter rope is cut into three pieces with each piece twice as long as the previous one. How long is the longest piece?
- টেলিফোনের মোট কল সংখ্যা হল 'n' এবং প্রত্যেক কলের চার্জ হল 'p'। মোট কল চার্জ কত হবে?
- Ehsan was preparing to make a tape from some of his favourite songs. He noticed that Hadi's song was 1 minute longer than Bonna's song. Duration of Niaj's song was 1 minute shorter than twice the duration of Bonna's song. If the total time for these songs is 12 minutes, how long is Niaj's song?