Heat transfer by conduction is the reason heat flows in glass pane faster in the wind. ... The number of molecules colliding with your glass pane increases as the wind speed increases. The rate at which glass pane loses heat increases, and it cools down faster. The wind-chill accounts for the increased loss of heat by the movement of the air.
Nolana answered the question on March 22, 2019 at 18:19
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An electric kettle with a shiny outer surface would be more efficient than one with a dull outer surface. Explain
(Solved)
An electric kettle with a shiny outer surface would be more efficient than one with a dull outer surface. Explain
Date posted:
February 23, 2019
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Answers (1)
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How many images would be seen from two mirrors when reflecting surfaces make an angle of 60 degree with each other?
(Solved)
How many images would be seen from two mirrors when reflecting surfaces make an angle of 60 degree with each other?
Date posted:
February 23, 2019
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Answers (1)
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A body weighs 32N in kerosene and 30N in water. If the body weighs 40N in air, find the relative density of kerosene.
(Solved)
A body weighs 32N in kerosene and 30N in water. If the body weighs 40N in air, find the relative density of kerosene.
Date posted:
February 11, 2019
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Answers (1)
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A metal block of density 7.8g/cm3 weighs 117N in air. Find the weight of the block when fully immersed in water of density 1.0g/cm3.
(Solved)
A metal block of density 7.8g/cm3 weighs 117N in air. Find the weight of the block when fully immersed in water of density 1.0g/cm3.
Date posted:
February 2, 2019
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Answers (1)
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A particle revolves at 2Hz in a circle of radius 2m. Calculate its linear speed and angular velocity.
(Solved)
A particle revolves at 2Hz in a circle of radius 2m. Calculate its:
a) Linear speed
b) Angular velocity
Date posted:
January 29, 2019
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Answers (1)
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A screen is placed 80cm from an object. A lens is used to produce on the screen an image with a magnification of 3. What...
(Solved)
A screen is placed 80cm from an object. A lens is used to produce on the screen an image with a magnification of 3. What is the distance between the object and the lens? Calculate the focal length of that lens.
Date posted:
January 21, 2019
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Answers (1)
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A bullet is shot vertically upward and rises for a maximum height of 1000 m. What is the initial velocity...
(Solved)
A bullet is shot vertically upward and rises for a maximum height of 1000m. What is the initial velocity of the bullet and the total time of flight?
Date posted:
January 14, 2019
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Answers (1)
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Explain why during anomalous expansion of water, heat transfer is limited to conduction and radiation
(Solved)
Explain why during anomalous expansion of water, heat transfer is limited to conduction and radiation.
Date posted:
December 30, 2018
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Answers (1)
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State a reason why it may not be possible to suck a liquid into your mouth using drinking straw on the surface of the moon
(Solved)
State a reason why it may not be possible to suck a liquid into your mouth using drinking straw on the surface of the moon.
Date posted:
December 10, 2018
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Answers (1)
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State the reason why the speed of the water at the narrow section of a river is higher than at the wider section
(Solved)
State the reason why the speed of the water at the narrow section of a river is higher than at the wider section.
Date posted:
November 29, 2018
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Answers (1)
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A radioactive element has an initial count rate of 2,400 counts per minute on a scaler. The count rate falls to 300 units per minute...
(Solved)
A radioactive element has an initial count rate of 2,400 counts per minute on a scaler. The count rate falls to 300 units per minute in 30 hours, (a) Calculate the half-life of the element (b) If the initial number of atoms in another sample of the same element is 6.0 × 1020, how many atoms will have decayed in 50 hours?
Date posted:
October 17, 2018
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Answers (1)
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The initial number of atoms in a sample is 5.12 × 1020. If the half-life of the sample is 3.0 seconds, determine the number of...
(Solved)
The initial number of atoms in a sample is 5.12 × 1020. If the half-life of the sample is 3.0 seconds, determine the number of atoms that will have decayed after six seconds.
Date posted:
October 17, 2018
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Answers (1)
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The half-life of a sample of a radioactive substance is 98 minutes. How long does it take for the activity of the sample to reduce...
(Solved)
The half-life of a sample of a radioactive substance is 98 minutes. How long does it take for the activity of the sample to reduce to 1/16th of the original value?
Date posted:
October 17, 2018
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Answers (1)
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Explain ways of detecting nuclear radiation
(Solved)
Explain ways of detecting nuclear radiation.
Date posted:
October 17, 2018
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Answers (1)
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Sodium has a work function of 2.0 e: Calculate (a) The maximum energy and velocity of the emitted electrons when sodium is Illuminated by...
(Solved)
Sodium has a work function of 2.0 e: Calculate
(a) The maximum energy and velocity of the emitted electrons when sodium is Illuminated by a radiation of wavelength 150 nm.
(b) Determine the least frequency of radiation by which electrons are emitted. (Take ‘h’ = 6.626 × 10-34 Js, e = 1.6 × 10-19, c = 3.0 × 108 m/s and mass of electron = 9.1 × 10-31 kg).
Date posted:
October 17, 2018
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Answers (1)
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The threshold frequency for lithium is 5.5 × 1014 Hz. Calculate the work function for lithium. (Take ‘h’ = 6.626 × 10-34 Js)
(Solved)
The threshold frequency for lithium is 5.5 × 1014 Hz. Calculate the work function for lithium. (Take ‘h’ = 6.626 × 10-34 Js)
Date posted:
October 17, 2018
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Answers (1)
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Cathode Ray Oscilloscope components and functioning
(Solved)
Cathode Ray Oscilloscope components and functioning.
Date posted:
October 16, 2018
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Answers (1)
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Illustrate domestic wiring system with aid of a diagram
(Solved)
Illustrate domestic wiring system with aid of a diagram
Date posted:
October 16, 2018
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Answers (1)
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A house has five rooms each with a 60 W, 240 V bulb. If the bulbs are switched on from 7.00 pm to 10.30 pm,...
(Solved)
A house has five rooms each with a 60 W, 240 V bulb. If the bulbs are switched on from 7.00 pm to 10.30 pm, calculate the;
(a) Power consumed per day in kWh
(b) Cost per week for lighting those rooms if it costs 90 cents per unit.
Date posted:
October 16, 2018
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Answers (1)
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An electric kettle is rated at 2,500 W and uses a voltage of 240 V. (a) If electricity costs Ksh 1.10 per kWh, what is...
(Solved)
An electric kettle is rated at 2,500 W and uses a voltage of 240 V. (a) If electricity costs Ksh 1.10 per kWh, what is the cost of running it for 6 hrs? (b) What would be its rate of dissipating energy if the mains voltage was dropped to 120 V?
Date posted:
October 16, 2018
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Answers (1)