Bright shiny surfaces are poor radiators while black surfaces are good radiator. The shiny tea pot radiates away less heat keeping the tea hot.
chrispohmomanyi answered the question on September 27, 2017 at 09:02
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State any difference between sound and water waves.
Date posted: September 27, 2017. Answers (1)
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Explain how the rotation of blades at the the top of the helicopter enables it to take off.
Date posted: September 27, 2017. Answers (1)
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During strong windy day, the roof is likely to be taken off. Explain
Date posted: September 27, 2017. Answers (1)
- A microscope is focused on a mark on horizontal surface. A rectangular glass block 30mm thick is
place on the mark. The microscope is then adjusted...(Solved)
A microscope is focused on a mark on horizontal surface. A rectangular glass block 30mm thick is
place on the mark. The microscope is then adjusted dd10mm upwards; to bring the mark back to
focus, determine the refractive index of the glass
Date posted: September 26, 2017. Answers (1)
- When a current of 2.0 flows in a resistor for 10 minutes, 15,000 joules of electrical energy is
displaced. Determine the voltage the resistor(Solved)
When a current of 2.0 flows in a resistor for 10 minutes, 15,000 joules of electrical energy is
displaced. Determine the voltage the resistor
Date posted: September 26, 2017. Answers (1)
- Two tuning forks of frequencies 256Hz and 258 Hz are sounded simultaneously and then placed
close to each other, calculate the beat frequency(Solved)
Two tuning forks of frequencies 256Hz and 258 Hz are sounded simultaneously and then placed
close to each other, calculate the beat frequency
Date posted: September 26, 2017. Answers (1)
- Explain why a person should crawl close to the floor in a smoke-filled room.(Solved)
Explain why a person should crawl close to the floor in a smoke-filled room.
Date posted: September 26, 2017. Answers (1)
- Define the following terms.
1. Incident ray
2. Reflected ray
3. The Normal(Solved)
Define the following terms.
1. Incident ray
2. Reflected ray
3. The Normal
Date posted: September 26, 2017. Answers (1)
- Define parallax as used in rectilinear propagation of light(Solved)
Define parallax as used in rectilinear propagation of light
Date posted: September 26, 2017. Answers (1)
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State the characteristics of images formed by a plane mirror
Date posted: September 26, 2017. Answers (1)
- Describe how you can charge an electroscope positively using a positively charged conductor.(Solved)
Describe how you can charge an electroscope positively using a positively charged conductor.
Date posted: September 26, 2017. Answers (1)
- Two tuning forks of frequencies 256Hz and 258 Hz are sounded simultaneously and then placed close to each other, calculate the beat frequency.(Solved)
Two tuning forks of frequencies 256Hz and 258 Hz are sounded simultaneously and then placed close to each other, calculate the beat frequency.
Date posted: September 25, 2017. Answers (1)
- An electric pump can raise water from a low level reservoir to the higher – level reservoir at the rate of 3.0 x 10^5 kg...(Solved)
An electric pump can raise water from a low level reservoir to the higher – level reservoir at the rate of 3.0 x 10^5 kg per hour.The vertical height of the water raised 360m.If the rate of energy loss in form of heat is 200KW, determine the efficiency of the pump.
Date posted: September 25, 2017. Answers (1)
- Two tuning forks are sounded together. What is the condition for the beats to be heard(Solved)
Two tuning forks are sounded together. What is the condition for the beats to be heard
Date posted: September 25, 2017. Answers (1)
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Explain any two applications of electromagnets.
Date posted: September 25, 2017. Answers (1)
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State Fleming’s right-hand rule or the motor rule
Date posted: September 25, 2017. Answers (1)
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State factors that affect the strength of the electromagnet in the solenoid
Date posted: September 25, 2017. Answers (1)
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State right hand grip rule for a loop.
Date posted: September 25, 2017. Answers (1)
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State Maxwell Right hand grip rule for a straight conductor carrying current.
Date posted: September 25, 2017. Answers (1)
- State ampere's swimming rule.(Solved)
State ampere's swimming rule.
Date posted: September 25, 2017. Answers (1)