Discuss why a 1-ft2 hole in a ceiling that admits sunlight when the Sun is overhead is like having a 100-W bulb in the room. Assume the atmosphere reduces solar energy at Earth’s surface as 1.0 kW/m2.

Q: What thickness of (a) concrete, (b) brick wood have the same insulating ability as 10 cm of glass…

A: Since the rate of heat transfer is proportional to the temperature difference and the area and…

Q: What is vulnerabilty of security guards during heat waves? What  problems they might face during…

A: Heat is just energy in transit. When it is not moving it is thermal energy. It is that heat flows…

Q: If the energy received by 6 m² area in 10 minutes is 3680 KJ. Calculate the value of Solar constant…

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Q: In what form does the radiant energy travels?

A: Light is the form of radiant energy. Radiant energy travels through waves or particles.

Q: Why is it possible to hold a lighted match stick until the flame burns quite close to the fingers?

A: The match stick is made up of wood which is the bad conductor of heat. When the lighted match stick…

Q: If the energy received by 4 m² area in 8 minutes is 2890KJ. Calculate the value of Solar constant ?

A: Given data :   Time   =  t   Area   =  A   Energy   =  E        To find :     Solar constant

Q: A tennis ball bounces on the floor three times. If each time it loses 23.0% of its energy due to…

A: The ball loses 23% of the total energy in form of heat after every bounce. Therefore, the remaining…

Q: If the energy received by 3 m² area in 6 minutes is 3690KJ. Calculate the value of Solar constant ?

A: Given data :   Time  =   t   Area   =  A  Energy   =  E        To find :           Solar constant

Q: A 60-kg person proposed to drink a 900-kilocalorie brown-sugar milk tea with pearls and pudding, and…

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Q: How do I calcualte the surface area of my body times and the energy being radiated per surface area…

A: We need to formulate how to calculate the surface area of your body times and the energy being…

Q: If the energy received by 6 m2 area. in 9 minutes is 4290KJ. Calculate the value of Solar constant ?

A: Given energy 4290kj and area 6m2 and time 9 minutes We have to calculate the value of Solar…

Q: If the energy received by 2 m² area in 250 seconds is 1180 KJ. Calculate the value of Solar constant…

A: Introduction :  In this question we are provided with value of  energy , area and time . with these…

Q: (W/m), in Santa solar radiation into energy. solar radiation (w/m?} 400 300 200 100 4 8 12 16 20…

A: We have been given curve of intensity of the solar radiation with respect to time. 18% of this…

Q: If the energy received by 4 m² area in 10 minutes is 2120 KJ. Calculate the value of Solar constant…

A: Given data:  Area (A) = 4 m2 Time (t) = 10 minutes = 600 s Energy (E) = 2120 kJ = 2120×103 J…

Q: Why are such materials as wood, fur, feathers, and even snow good insulators?

A: The materials which allow the free passage of electricity through them with very low resistance are…

Q: If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.

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Q: Show that 1kW-hr is the same as 3.6MJ

A: Concept: kW-hr is unit of energy. It is defined as amount of energy consumed from a power source ,…

Q: A bulb delivers 40 W of radiant energy when its filament is at 2500°C. If the temperature increases…

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Q: Discuss the function of photovoltaic cell.What does it produce?

A: The photovoltaic cell is a cell which is used to convert the light into direct current. It works in…

Q: From greatest to least, rank the frequency of radiation of these emitters of radiant energy: (a)…

A: Red-hot star Bluehot star and the Sun, they all emit electromagnetic waves with the frequency of the…

Q: Cite a primary difference between waves of solar radiation and waves of terrestial radiation?

A: Solar radiation is the radiant energy produced by the Sun from a nuclear reaction. Terrestrial…

Q: A submerged heater is used to keep an aquarium above room temperature. Where should the heater be…

A: Hot water has low density while cold water has high density .

Q: Calculate the energy in mJ of a 1.6 kg bar of copper that is heated at atmospheric pressure between…

A: Mass of copper bar m=1.6 kg and it is heated from a temperature T1=39oC=312 K to a temperature…

Q: Why is insulation in an attic commonly thicker than the insulation in the walls of a house?

A: It is a basic law of physics that heat rises. Therefore, more heat can be lost at the ceiling or…

Q: If the energy received by 5 m2 area. in 8 minutes is 3220KJ. Calculate the value of Solar constant ?

A: Given , Energy (E )= 3220 kJ Area(A) = 5 m2 Time ( t ) = 8 minutes                  =  8×60 s…

Q: A bulb delivers 25 W of radiant energy when its filament is at 1500 °C . If the temperature…

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Q: At the top of Earth’s atmosphere, sunlight has an averageintensity of 1360 W>m2. If the average…

A: The average intensity of sunlight,   The average distance from Earth to the Sun,

Q: radiant energy is experenced by a person standing near a brick wall. Assuming the wall has a surface…

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Q: What physical phenomenon predominantly contributes to the magentic field of the earth

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Q: If the energy received by 8 m² area in 14 minutes is 4600KJ. Calculate the value of Solar constant ?

A: Given data :   Energy  =  E   Area   =   A   Time   =  T          To find :         Solar constant

Q: 7. Compute for the radiation energy of an ideal radiator with radius 6.7 m in a temperature of 39°C.

A: Given value--- radius = 6.7 m . temperature = 39 degrees C. We have to find--- radiated energy?

Q: Why is it advisable to allow telephone wires to sag when stringing them between poles in summer?

A: Why is it advisable to allow telephone wires to sag when stringing them between poles in summer?

Q: Why are materials such as glass and and rubber good insulators?

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Q: In a closed room dust generally settles down. Why?

A: Dust generally settles down in a closed room. The small dust particles acquire a very small terminal…

Q: Calculate the kinetic energy in joules of a 84 kg traveling at 4.26 m/s ?

A: Given data :                          Velocity  =  v                            Mass    =  m…

Q: In buildings that are being electrically heated, is it at all wasteful to turn all the lights on? Is…

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Q: Why do the machine parts gets jammed in winters?

A: 1) Due to the low temperature in winter, the coefficient of viscosity of the engine oil and the…

Q: If the energy received by 7 m² area in 6 minutes is 4290KJ. Calculate the value of Solar constant ?

A:

Q: Dimpho decides to fill hot water bottles to tuck between the sheets at the foot of the beds. If she…

A: Given data: Volume of water is,V=4.0 L=4.01000=0.004 m3. Initial temperature is, T1=10.0∘C. Final…

Q: To help keep his barn warm on cold days, a farmer stores 837 kg of solar-heated water (Lf = 3.35E+5…

A: Heat energy required to cool the water and thereafter for complete freezing is,